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Caterpillar 3412E Engine

The Caterpillar 3412E is a 12 L 6-cylinder turbocharged/aftercooled engine rated at 1800 rpm, producing up to 544 kW. It powers generator sets from Caterpillar and Solar Turbines, including the 3406E, 3412 and CENTAUR 50. It holds 730 L (192.8 gal) of oil and 750 L (198.1 gal) of coolant.

Also known as: Caterpillar 3412E

Part of the Caterpillar 3412E engine family — 2 variants share parts & fitment.

12.0 L

Displacement

Cylinders

1800 rpm

Rated speed

544 kW

Gross power

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Service parts for the 3412E

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Air intake

1 required

7T1S90Air filterfind

Fuel system

1 required

1165436Fuel filtersee priceAmazon

Oil system

1 required

2P4005Oil filter$23.97PartsGeek

Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.

Engine specifications

Oil capacity	730.0 L
Coolant capacity	750.0 L
Displacement	12.0 L
Cylinders	6
Aspiration	Turbocharged/Aftercooled
Rated speed	1800 rpm
Gross power	544 kW

Generator sets powered by this engine

Shared across brands: Caterpillar, Solar Turbines

Caterpillar 3406E Caterpillar 3412 Caterpillar 3412E Solar Turbines CENTAUR 50 Solar Turbines Centaur 40 Solar Turbines Mars 100 Solar Turbines Mars 90 Solar Turbines Mercury 50 Solar Turbines TAURUS 70 Solar Turbines Titan 130

How to read your Caterpillar engine serial & model number →

Common problems

Increased coolant temperature null
Very Low Oil Pressure 100-11
Very Low Coolant Level 111-11
Very High Intake Manifold Air Temperature 105-11
Very High Coolant Temperature 110-11
Vehicle Overspeed Warning 84-00
Quick Stop Occurrence 84-14
Fault shutdown 21
Fault alarm 22
Engine Overspeed Warning 190-00
Engine overspeed i01226491
Fix: Stop the engine by shutting off the fuel supply to the engine and/or shutting off the air supply to the engine.
Diagnostic Code 55 55
0 3111

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 3412E.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Air filter			—
Fuel filter			—
Oil filter			2P4005	200 hr	Amazon eBay $32.99 PartsGeek $23.97 NAPA $33.79 KuduParts $39.00 FridayParts $41.73
Battery			—
Belt			—
Coolant		72.5 L	—
Oil	Caterpillar DEO 10W30 or 15W40	85.0 L	—	200 hr
Spark plug			—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Service intervals

Item	Action	Hours	Months	Notes
System	Test	1 hr		ToCI quarterly: exercise system under full load for 1 hour
Sea Water Strainer	Clean	50 hr		When required and every 3800 L (1000 US gal) of fuel or 50 service hours
Zinc rods	Inspect	50 hr		First service — Within 24 hours of initially filling the plumbing with sea water; if no significant corrosion, inspect again after seven days or 50 hours of engine operation
Engine oil (S-O-S oil sample)	Test	125 hr		Severe service occurs at high loads, in high temperatures, and in dusty conditions
Alternator Belt	Inspect	250 hr	12 mo	Inspect/adjust/replace; every 12 750 L (3375 US gal) of fuel or 250 h or yearly (8RG1-Up); every 19 000 L (5000 US gal) or 250 h or yearly (REA1-Up, 3JK1-Up, 7BL1-Up)
Alternator and Fan Belts	Replace	250 hr		Inspect/Adjust/Replace - Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Battery Electrolyte Level	Check	250 hr	12 mo	Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Coolant (S-O-S coolant analysis Level 1)	Test	250 hr		Cat ELC - Every 250 Hours; also the recommended sampling interval for all conventional heavy-duty coolant/antifreeze and for commercial coolants that meet Cat EC-1
Cooling System Coolant Sample (Level 1)	Test	250 hr		Obtain - Every 250 Service Hours
Cooling System Supplemental Coolant Additive (SCA)	Test	250 hr	12 mo	Test/Add; 8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Engine Air Cleaner Element	Clean	250 hr	12 mo	Clean/Replace; 8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Engine Crankcase Breather	Clean	250 hr	12 mo	Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Engine Oil Sample	Other	250 hr	12 mo	Obtain S·O·S oil sample; 8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Engine Oil and Filter	Change	250 hr	12 mo	8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Engine Protective Devices	Check	250 hr		Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Engine crankcase oil (S-O-S oil sample)	Test	250 hr		Table 6 S-O-S Oil Sampling Interval; severe applications may require a more frequent oil sampling interval
Fuel System Primary Filter	Clean	250 hr	12 mo	Clean/Replace; 8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Fuel System Secondary Filter	Replace	250 hr	12 mo	8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Fuel Tank Water and Sediment	Drain	250 hr	12 mo	8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Hoses and Clamps	Inspect	250 hr	12 mo	Inspect/Replace; 8RG1-Up: 12 750 L (3375 US gal) or 250 h or yearly; other S/N: 19 000 L (5000 US gal) or 250 h or yearly
Magnetic Pickups	Clean	250 hr		First service — Clean/Inspect - First 19 000 L (5000 US gal) of Fuel or 250 Service Hours
SCA (Supplemental Coolant Additive) concentration	Test	250 hr		Test the concentration of SCA or submit a coolant sample at 250 hour intervals or at PM Level 1 intervals; check at every oil change or every 250 hours, whichever occurs first
Coolant (S-O-S coolant analysis Level 2)	Test	500 hr	12 mo	First service — For new systems, refilled systems, and converted systems that use Cat ELC or Cat DEAC; also every year; use the interval that occurs first
Aftercooler Core	Clean	1000 hr		When required; also every 76 000 L (20 000 US gal) of fuel or 1000 service hours
Heat Exchanger	Inspect	1000 hr		When required; also every 76 000 L (20 000 US gal) of fuel or 1000 service hours
Engine Speed/Timing Sensors	Check	1500 hr		Check/Clean/Calibrate; 76 500 L (20 250 US gal) of fuel or 1500 h (8RG1-Up); 114 000 L (30 000 US gal) or 1500 h (REA1-Up, 3JK1-Up, 7BL1-Up)
Engine Valve Lash	Adjust	1500 hr		First service — Inspect/Adjust; 76 500 L (20 250 US gal) of fuel or 1500 h (8RG1-Up); 114 000 L (30 000 US gal) or 1500 h (other S/N)
Engine Valve Rotators	Inspect	1500 hr		76 500 L (20 250 US gal) of fuel or 1500 h (8RG1-Up); 114 000 L (30 000 US gal) or 1500 h (other S/N)
Cooling System Coolant Sample (Level 2)	Test	2000 hr	12 mo	First service — Obtain - Every 2000 Service Hours or 1 Year
Engine	Clean	2000 hr	6 mo	Every 2000 Service Hours or 6 Months
Fuel System	Other	2000 hr	6 mo	Prime - Every 2000 Service Hours or 6 Months
Generator	Other	2000 hr	6 mo	Dry - Every 2000 Service Hours or 6 Months
Generator Lead (Round Cable)	Check	2000 hr		Every 2000 Service Hours
Generator Set	Test	2000 hr	6 mo	Every 2000 Service Hours or 6 Months
Rotating Rectifier	Test	2000 hr	6 mo	Every 2000 Service Hours or 6 Months
Severe Service Application	Check	2000 hr	6 mo	Every 2000 Service Hours or 6 Months
Alternator	Inspect	3000 hr		153 500 L (40 500 US gal) of fuel or 3000 h (8RG1-Up); 228 000 L (60 000 US gal) or 3000 h (REA1-Up, 3JK1-Up, 7BL1-Up)
Auxiliary Water Pump	Inspect	3000 hr		153 500 L (40 500 US gal) of fuel or 3000 h (8RG1-Up); 228 000 L (60 000 US gal) or 3000 h (other S/N)
Cooling System Coolant (DEAC)	Change	3000 hr		153 500 L (40 500 US gal) of fuel or 3000 h (8RG1-Up); 228 000 L (60 000 US gal) or 3000 h (other S/N)
Cooling System Water Temperature Regulator	Replace	3000 hr		153 500 L (40 500 US gal) of fuel or 3000 h (8RG1-Up); 228 000 L (60 000 US gal) or 3000 h (other S/N)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Service specifications

Type	Item	Value	Unit	Condition
Clearance	Bearing bracket step minimum	less than 0.0762	mm
Clearance	Connecting rod bearing clearance (max permissible, used bearings)	0.20	mm (0.008 inch)
Clearance	Connecting rod bearing clearance (new bearings)	0.062 to 0.160	mm (0.0024 to 0.0063 inch)
Clearance	Coolant level below bottom of filler pipe (engines without recovery tank)	within 13	mm	0.5 inch
Clearance	Crankshaft end play	.178 to .635	mm (0.0070 to 0.0250 inch)	measured with dial indicator
Clearance	Crankshaft end play (max permissible, used thrust plates)	0.89	mm (0.035 inch)
Clearance	Crankshaft end play (new thrust plates)	0.15 to 0.55	mm (0.006 to 0.022 inch)
Clearance	Crankshaft end play after assembly	0.178 to 0.635	mm (0.0070 to 0.0250 inch)	after assembly
Clearance	Crankshaft main bearing clearance (max permissible, used bearings)	0.25	mm (0.010 inch)
Clearance	Crankshaft main bearing clearance (new bearings)	0.091 to 0.186	mm (0.0036 to 0.0073 inch)
Clearance	Damper pilot runout limit	0.10	mm	vibration analysis
Clearance	Dowel protrusion from crankshaft face	4.1 + 0.5	mm (0.16 + 0.02 inch)
Clearance	End play at heat sink after assembly	0.076 to 0.635	mm (0.0030 to 0.0250 inch)	after assembly
Clearance	Gap at 3, 6, 9, 12 o'clock positions	0.03 to 0.13	mm (0.001 to 0.005 inch)	between
Clearance	Gap between generator and flywheel housing at locations (E), (F), (G), (H)	>0.03 and <0.13	mm (0.001 inch to 0.005 inch)	more than 0.03 mm and less than 0.13 mm
Clearance	Generator forward offset from midpoint of end play	+ 0.50	mm (+ 0.0200 inch)	while generator supported by crane
Clearance	Maximum dowel length out of crankshaft face	6.4	mm (0.25 inch)
Clearance	Rotor end play	3.81 to 7.62	mm (.150 to .300 inch)	approximately
Clearance	Shim thickness divisor for number of shims	0.8	mm (0.03 inch)	divide Letter L by this value
Clearance	Support deflection during bolt tightening	0.13	mm (0.005 inch)	maximum allowed movement
Clearance	Unit injector height (from top of unit injector to machined ledge of fuel injector body)	78.0 ± 0.2	mm
Clearance	Valve guide bore surface diameter	35.00 + 0.50	mm (1.378 + 0.020 inch)
Clearance	Water pump leakage considered normal as engine cools	small amount		water pump seal is lubricated by coolant in the cooling system
Other	Accelerator pedal position sensor duty cycle at high idle	75 to 90	percent	high idle
Other	Accelerator pedal position sensor duty cycle at low idle	10 to 22	percent	low idle
Other	Alternator belt deflection	13 to 19	mm	110 N (25 lb) of force applied midway between the pulleys; 0.50 to 0.75 inch
Other	Belt tension deflection	0.50 to 0.75	inch	110 N (25 lb) force midway between pulleys
Other	Belt tension deflection	13 to 19	mm	110 N (25 lb) force midway between pulleys
Other	Caterpillar Fast Acting Cooling System Cleaner concentration	0.5	L per 15 L	1 pint per 4 US gal of cooling system capacity
Other	Chlorine content limit for heat exchanger cleaning water	more than 300	ppm	water containing more than 300 ppm of chlorine should not be used
Other	Coolant level below filler pipe bottom	13	mm
Other	Cooling system fill rate	no faster than 19	L per minute	5 US gal per minute to avoid air locks
Other	Cooling system fill rate (maximum)	19	L per minute	to avoid air locks
Other	Engine monitoring derate maximum rate	10	percent per second	warning/derate graph
Other	Engine speed/timing sensor calibration tolerance (primary vs secondary)	3	degrees	0022-11 / 0022-13
Other	Engine valve rotator operation	should turn slightly when valves close
Other	Exercise under full load	1	hour	ToCI quarterly
Other	Full load test duration	4	hours	Once per year
Other	Generator excitation PMG short circuit capability	3 X In for 10 seconds
Other	High idle speed for droop governors	approximately 2% to 5%	above full load speed	governors equipped with droop
Other	Load bank data recording interval	15	minutes	During load bank test
Other	Load bank test load level	80	% of generator nameplate capacity	4-hour resistive load bank test
Other	Load bank test profile	2 hours at 50%, 1 hour at 75%, 1 hour at 100%		Annual four (4) hour load bank test
Other	Paper air cleaner element reuse limit	up to six	times	replace at least one time per year regardless of number of cleanings
Other	Plate type heat exchanger cleaner concentration	maximum 4	percent by weight	cleaning solution temperature less than 60°C (140°F)
Other	Rating condition (diesel 7 L and higher)	99 kPa (29.31 in Hg) dry barometer, 25°C (77°F)		SAE J1995 inlet air standard
Other	Rating condition (diesel up to 6.6 L)	100 kPa (29.5 in Hg) total barometric pressure, 1 kPa (.295 in Hg) vapor pressure, 25°C (77°F)		ISO/TR14396 inlet air standard
Other	Rating condition (gas)	100 kPa (29.61 in Hg) and 25°C (77°F)		SAE J1349 standard
Other	Solvent contact time with heat exchanger gaskets	not more than half an hour		natural rubber, butyl rubber and EPDM gaskets swell in these solvents
Other	Speed droop values commonly used	3% and 0%	%
Other	Supplemental Coolant Additive (SCA) concentration, coolant and SCA	do not exceed six	percent
Other	Supplemental Coolant Additive (SCA) concentration, water and SCA	do not exceed eight	percent
Other	Turbocharger V-band clamp position	90 ± 10	degrees	outboard from the bottom vertical
Other	Turbocharger compressor housing air outlet position	zero	degrees	from top vertical
Other	Turbocharger weight	34	kg	approximately (75 lb)
Other	Unit injector height (cylinders 1, 2, 4)	78.0 + 0.2	mm	measured from top of unit injector to machined ledge of fuel injector body, using 9U-7227 gauge
Other	Unit injector height (cylinders 3, 5, 6)	78.0 + 0.2	mm	measured from top of unit injector to machined ledge of fuel injector body, using 9U-7227 gauge
Other	Vibration amplitude limit (acceptable engine performance)	4.0	mils	engine vibration measurement
Other	Vibration damper inspection	dented, cracked, leaking, bent or discolored damper must be replaced
Other	Voltage droop for 0.8 power factor load	approximately 5	%	loads with a power factor of 0.8

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Ambient	Capacity	Notes
Coolant	Cat DEAC				Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat DEAC (Diesel Engine Antifreeze/Coolant)	Acceptable coolant; commercial heavy-duty antifreeze/coolant must meet ASTM D4985 or ASTM D6210			Conventional heavy-duty coolant/antifreeze. Caterpillar recommends a 1:1 mixture of water and glycol. Do not use a commercial coolant/antifreeze that only meets the ASTM D3306 specification. Do not use Cat SCA at the initial fill when Cat DEAC is used.
Coolant	Cat DEAC Diesel Engine Antifreeze/Coolant	ASTM D4985 or ASTM D5345		58.0 L	Acceptable; 1:1 mixture of water and glycol; service life three years; does not require SCA at initial fill
Coolant	Cat ELC				Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis
Coolant	Cat ELC (Extended Life Coolant)	Caterpillar EC-1 specification (preferred); also meets ASTM D4985, ASTM D6210, and ASTM D3306			Service life of 12000 service hours or six years. Premixed ELC provides freeze protection to -37 C (-34 F); ELC Concentrate can be used to lower the freezing point to -52 C (-62 F). An Extender is the only additional maintenance needed at 6000 service hours or one half of the ELC service life. Cat ELC cooling systems can withstand contamination to a maximum of ten percent of conventional heavy-duty coolant/antifreeze and/or SCA.
Coolant	Cat ELC Extended Life Coolant	Caterpillar EC-1		58.0 L	Preferred; 1:1 mixture of water and glycol; service life six years; add ELC Extender once
Coolant	Cat ELC Extender				Add every 6000 service hours or 3 years according to requirements for cooling system capacity
Coolant	Cat NGEC				Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
Coolant	Cat SCA (Supplemental Coolant Additive) with water				SCA concentration in a cooling system that uses SCA and water should be six to eight percent by volume; do not exceed the eight percent maximum concentration. If Cat SCA is not used, the commercial SCA must provide a minimum of 2400 mg/L or 2400 ppm (140 grains/US gal) of nitrites in the final coolant mixture when used with water, and a minimum of 1400 mg/L or 1400 ppm (82 grains/US gal) with heavy-duty coolant/antifreeze.
Coolant	Caterpillar SCA and Water				For stationary applications not requiring boiling/freezing protection; minimum six percent to maximum eight percent SCA concentration; service life two years
Coolant	Glycol (ethylene glycol / propylene glycol)	Propylene glycol coolant must meet ASTM D6210-04			Ethylene glycol: 50 percent = freeze protection -37 C (-34 F), boil protection 106 C (223 F); 60 percent = -52 C (-62 F), 111 C (232 F). Propylene glycol: 50 percent = -32 C (-26 F), 106 C (223 F). Do not use propylene glycol in concentrations that exceed 50 percent; do not use ethylene glycol in concentrations that exceed 60 percent. All Caterpillar diesel engines equipped with air-to-air aftercooling (ATAAC) require a minimum of 30 percent glycol.
Engine oil		EPA 2D 89.330-96 (fuel reference, Diesel <6.6 L, density 0,845-0,850 kg/L a 15 °C)			Reference condition only, not a lubricant recommendation
Engine oil	Cat DEO (Diesel Engine Oil) 10W-30 and 15W-40	Cat ECF-1 (exceeds); API CI-4, API CI-4 PLUS, API CH-4, API CG-4, API CF (Cat DEO SAE 15W-40)			Caterpillar oils are used to fill diesel engines at the factory. Non-Caterpillar commercial oils are second choice oils. Do not use API CF-4 oils in Caterpillar diesel engines. Do not use single grade API CF oils or multigrade API CF oils in 3500 Series, C175 Series and smaller DI diesel engines.
Engine oil	Cat NGEO				Natural Gas
Engine oil	Commercial oils (DI engines)	Cat ECF-1 required; API CG-4 multigrade acceptable; API CH-4, API CI-4 and API CI-4 PLUS acceptable only if the requirements of Cat ECF-1 are met; do not use API CF-4 oils			Minimum TBN must be 10 times the fuel sulfur level (ASTM D2896); minimum TBN of the oil is 5 regardless of a low fuel sulfur level. API CG-4 oils: do not exceed the standard oil drain interval.
Engine oil	Commercial oils (PC engines)	Cat ECF-1; API CH-4, API CI-4, API CI-4 PLUS (if Cat ECF-1 requirements met); API CG-4 multigrade; API CF-4 multigrade; API CF			Minimum TBN of the oil that is used in PC engines must be 20 times the fuel sulfur level; minimum TBN of new oil is five. Change the oil when the TBN deteriorates to 50 percent of the original TBN.
Engine oil	Re-refined base stock oils				Acceptable if they meet the performance requirements specified by Caterpillar; filtering is inadequate for producing high quality re-refined base stock oils.
Engine oil	SAE 10W30				Referenced as the oil used when normal operating engine oil pressure is specified
Engine oil	Synthetic base stock oils				Acceptable if they meet the performance requirements specified for the engine compartment. Caterpillar does not recommend the automatic extension of oil drain intervals for any type of oil.
Engine oil	meeting manufacturer's specs				Add crankcase oil (grade meeting manufacturer's specs) to correct level (SCI)
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 0W-20		-40°C to 10°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 0W-30		-40°C to 30°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 0W-40		-40°C to 40°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 5W-30		-30°C to 30°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	SAE 5W-40		-30°C to 50°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 10W-30		-18°C to 40°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines); SAE 10W-30 is the preferred viscosity grade for the 3116, 3126, C7, C-9 and C9 diesel engines between -18 C (0 F) and 40 C (104 F)
Engine oil	SAE 10W-40		-18°C to 50°C		Table 1 Lubricant Viscosities for Ambient Temperatures (DI diesel engines)

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
0001-11	Cylinder #1 Injector current fault	The ECM detects a low current condition (open circuit) in the No. 1 cylinder injector solenoid wiring or a high current condition (short circuit) in the injector solenoid. Flash code 72.	Warning	Perform "Injector Solenoid Circuit - Test"
0002-11	Cylinder #2 Injector current fault	Low current (open circuit) or high current (short circuit) in the No. 2 cylinder injector solenoid. Flash code 72.	Warning	Perform "Injector Solenoid Circuit - Test"
0003-11	Cylinder #3 Injector current fault	Low current (open circuit) or high current (short circuit) in the No. 3 cylinder injector solenoid. Flash code 73.	Warning	Perform "Injector Solenoid Circuit - Test"
0004-11	Cylinder #4 Injector current fault	Low current (open circuit) or high current (short circuit) in the No. 4 cylinder injector solenoid. Flash code 73.	Warning	Perform "Injector Solenoid Circuit - Test"
0005-11	Cylinder #5 Injector current fault	Low current (open circuit) or high current (short circuit) in the No. 5 cylinder injector solenoid. Flash code 74.	Warning	Perform "Injector Solenoid Circuit - Test"
0006-11	Cylinder #6 Injector current fault	Low current (open circuit) or high current (short circuit) in the No. 6 cylinder injector solenoid. Flash code 74.	Warning	Perform "Injector Solenoid Circuit - Test"
0022-11	Primary to Secondary Engine Speed Signal Calibration	A timing calibration has been completed and the primary and secondary speed/timing sensors are off by more than 3 degrees. ECM uses default timing. Flash code 42.	Warning	Check the cluster gear, camshaft backlash and engine speed/timing sensors
0022-13	Engine Speed Signal Calibration Not Performed	A timing calibration has never been performed on a new ECM or the timing is off by more than 3 degrees. ECM uses default timing. Flash code 42.	Warning	Perform "Engine Speed/Timing Sensor - Calibrate"
0030-08	PTO Throttle signal invalid	The PTO Configuration is programmed to Remote Throttle and the ECM is not receiving a valid signal from the PTO throttle. Flash code 29.	Warning	Perform "Remote PTO Accelerator Position Sensor Circuit - Test"
0030-13	PTO Throttle out of calibration	The duty cycle of the PTO throttle signal is less than 5 percent or more than 95 percent for more than two seconds with PTO Configuration programmed to Remote Throttle. Flash code 29.	Warning	Perform "Remote PTO Accelerator Position Sensor Circuit - Test"
0041-03	8 Volt Supply voltage high	The 8 volt supply is more than 8.5 VDC for more than one second. Flash code 21.	Warning	Perform "Accelerator Pedal (Throttle) Position Sensor Circuit - Test"
0041-04	8 Volt Supply voltage low	The 8 volt supply is less than 7.5 VDC for more than one second. Flash code 21.	Warning	Perform "Accelerator Pedal (Throttle) Position Sensor Circuit - Test"
0043-02	Key Switch Fault	The key switch was rapidly cycled at least three times within the last second, indicating an intermittent battery circuit to the key switch or a low battery condition while the engine is running. Flash code 71.	Warning	Perform "Ignition Key Switch Circuit and Battery Supply Circuit - Test"
0052-11	Air Inlet Shutoff Shutdown	The engine was shut down due to an engine overspeed condition; ECM disables the unit injectors and activates the air inlet shutoff relay. Flash code 00.	Shutdown	Talk to the Operator to determine the reason for the engine overspeed; refer to "Air Inlet Shutoff Circuit - Test"
0054-05	Auxiliary Output #06 current low	A low current condition (open circuit) exists in the circuit for the lockout solenoid for more than two seconds with Transmission Style programmed to Eaton Top 2. Flash code 66.	Warning	Perform "Eaton Top 2 Transmission Circuit - Test"
0054-06	Auxiliary Output #06 current high	A high current condition (short circuit) exists in the circuit for the lockout solenoid for more than two seconds with Transmission Style programmed to Eaton Top 2. Flash code 66.	Warning	Perform "Eaton Top 2 Transmission Circuit - Test"
0055-05	Auxiliary Output #07 current low	A low current condition (open circuit) exists in the circuit for the shift solenoid with Transmission Style programmed to Eaton Top 2. Flash code 67.	Warning	Perform "Eaton Top 2 Transmission Circuit - Test"
0055-06	Auxiliary Output #07 current high	A high current condition (short circuit) exists in the circuit for the shift solenoid with Transmission Style programmed to Eaton Top 2. Flash code 67.	Warning	Perform "Eaton Top 2 Transmission Circuit - Test"
0064-12	Secondary Engine Speed loss of signal	The signal for the secondary engine speed/timing sensor is intermittent or lost. Flash code 34.	Warning	Perform "Engine Speed/Timing Sensor Circuit - Test"
0071-00	Idle Shutdown Override	The Allow Idle Shutdown Override parameter is programmed to Yes and the brake or clutch switch status changes within the final 90 seconds of the idle shutdown timer. Flash code 01.	Info	Perform "Idle Shutdown Timer - Test"
0071-01	Idle Shutdown	The idle shutdown timer has expired and the engine has shut down. Flash code 47.	Shutdown	Perform "Idle Shutdown Timer - Test"
0071-14	PTO Shutdown	The timer for the PTO has expired and the engine has shut down with the PTO On/Off switch in the ON position. Flash code 47.	Shutdown	Perform "PTO Shutdown Timer - Test"
0084-00	Vehicle Overspeed Warning	The vehicle speed exceeds the programmed Vehicle Speed Limit by more than 10 MPH (Soft VSL No) or 15 MPH (Soft VSL Yes) for more than 20 seconds. Flash code 41.	Warning	Perform "Vehicle Speed Circuit - Calibrate"
0084-01	Vehicle Speed loss of signal	The vehicle speed signal indicates 0 MPH while engine speed is above VSL Protection minus 100 rpm. Flash code 31.	Warning	Perform "Vehicle Speed and Speedometer Circuit - Test"
0084-02	Vehicle Speed signal invalid	The vehicle speed signal indicates a constant MPH with engine speed greater than 950 rpm. Flash code 36.	Warning	Perform "Vehicle Speed and Speedometer Circuit - Test"
0084-08	Vehicle Speed signal out of range	The vehicle speed signal indicates vehicle speed greater than 127.5 MPH for more than two seconds. Flash code 36.	Warning	Perform "Vehicle Speed and Speedometer Circuit - Test"
0084-10	Vehicle Speed signal rate of change	The vehicle speed signal changes more than 5 MPH on eight consecutive readings in three seconds. Flash code 36.	Warning	Perform "Vehicle Speed and Speedometer Circuit - Test"
0084-14	Quick Stop Occurrence	The vehicle speed slows at a rate that exceeds the programmed Quick Stop Rate with the service brake applied. The ECM records engine speed, vehicle speed, throttle position, cruise status, clutch switch and brake switch.	Info	No electronic system fault; check that the Quick Stop Rate parameter is not set too low
0091-08	Throttle Position Invalid	The signal frequency from the accelerator pedal position sensor is less than 150 Hz or greater than 1050 Hz for more than two seconds. Flash code 32.	Warning	Perform "Accelerator Pedal (Throttle) Position Sensor Circuit - Test"
0091-13	Throttle Position out of calibration	The duty cycle for the accelerator pedal position sensor is less than 5 percent or greater than 95 percent for more than two seconds. Flash code 32.	Warning	Perform "Accelerator Pedal (Throttle) Position Sensor Circuit - Test"
0100-01	Low Oil Pressure Warning	The engine oil pressure is below the trip line for more than eight seconds. Flash code 46.	Warning	Check engine oil level, sensor installation, active diagnostic codes, status screen, 5 volt supply and oil pressure map
0100-03	Oil Pressure voltage high	The signal voltage from the engine oil pressure sensor is greater than 4.8 VDC for more than eight seconds. Flash code 24.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0100-04	Oil Pressure voltage low	The signal voltage from the engine oil pressure sensor is less than 0.2 VDC for more than eight seconds. Flash code 24.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0100-11	Very Low Oil Pressure	The engine oil pressure is below the trip line for more than eight seconds. Engine speed limited to 1350 rpm and vehicle speed limited to 72 km/h (45 mph). Flash code 46.	Warning	Check engine oil level, sensor installation, active diagnostic codes, status screen, 5 volt supply and oil pressure map
0102-00	Excessive Boost Pressure	The actual boost pressure is higher than the desired boost pressure. Boost pressure is set to 0 kPa (0 psi).	Warning	Determine the cause of the excessive boost pressure such as a failed turbocharger wastegate or a pinched wastegate line
0102-03	Boost Pressure voltage high	The signal voltage from the boost pressure sensor is greater than 4.8 VDC for more than two seconds. Flash code 25.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0102-04	Boost Pressure voltage low	The signal voltage from the boost pressure sensor is less than 0.2 VDC for more than one second. Flash code 25.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0105-00	High Intake Manifold Air Temperature Warning	The intake manifold air temperature is greater than 90 C (194.0 F) for more than four seconds. Flash code 64.	Warning	Check the air-to-air aftercooler for debris and/or restriction to the air flow
0105-03	Intake Manifold Air Temperature voltage high	The signal voltage from the intake manifold air temperature sensor is greater than 4.9 VDC for more than eight seconds. Flash code 38.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0105-04	Intake Manifold Air Temperature voltage low	The signal voltage from the intake manifold air temperature sensor is less than 0.2 VDC for more than eight seconds. Flash code 38.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0105-11	Very High Intake Manifold Air Temperature	The intake manifold air temperature is greater than 109 C (228 F) for more than two seconds. Flash code 64.	Warning	Check the air-to-air aftercooler for debris and/or restriction to the air flow
0108-03	Barometric Pressure voltage high	The signal voltage from the atmospheric pressure sensor is greater than 4.9 VDC. Flash code 26.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0108-04	Barometric Pressure voltage low	The signal voltage from the atmospheric pressure sensor is low. Flash code 26.	Warning	Perform "Engine Pressure Sensor Open or Short Circuit - Test"
0110-00	High Coolant Temperature Warning	High coolant temperature warning. Flash code 61.	Warning	Refer to "Engine Temperature Sensor Open or Short Circuit - Test"
0110-03	Coolant Temperature voltage high	The signal voltage from the coolant temperature sensor is high. Flash code 27.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0110-04	Coolant Temperature voltage low	The signal voltage from the coolant temperature sensor is low. Flash code 27.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0110-11	Very High Coolant Temperature	Very high coolant temperature; in Shutdown mode the engine will be shut down. Flash code 61.	Shutdown	Refer to "Engine Temperature Sensor Open or Short Circuit - Test"
0111-01	Low Coolant Level Warning	Low coolant level warning. Flash code 62.	Warning	Check the coolant level sensor and circuit
0111-02	Coolant Level signal invalid	Invalid coolant level signal. Flash code 12.	Warning	Check the coolant level sensor and circuit
0111-03	Coolant Level voltage high	Coolant level voltage high. Flash code 12.	Warning	Check the coolant level sensor and circuit
0111-04	Coolant Level voltage low	Coolant level voltage low. Flash code 12.	Warning	Check the coolant level sensor and circuit
0111-11	Very Low Coolant Level	Very low coolant level; in Shutdown mode the engine will be shut down. Flash code 62.	Shutdown	Check the coolant level sensor and circuit
0121-05	Low/High Retarder current low	Low current condition in the Low/High retarder solenoid circuit. Flash code 14.	Warning	Perform "Retarder (Compression Brake) Solenoid Circuit - Test"
0121-06	Low/High Retarder current high	High current condition in the Low/High retarder solenoid circuit. Flash code 14.	Warning	Perform "Retarder (Compression Brake) Solenoid Circuit - Test"
0122-05	Med/High Retarder current low	Low current condition in the Med/High retarder solenoid circuit. Flash code 14.	Warning	Perform "Retarder (Compression Brake) Solenoid Circuit - Test"
0122-06	Med/High Retarder current high	High current condition in the Med/High retarder solenoid circuit. Flash code 14.	Warning	Perform "Retarder (Compression Brake) Solenoid Circuit - Test"
0168-02	ECM Battery Power Intermittent	Intermittent battery power to the ECM. Flash code 51.	Warning	Perform "Ignition Key Switch Circuit and Battery Supply Circuit - Test"
0171-03	Ambient Air Temperature voltage high	Ambient air temperature sensor voltage high.	Warning	Check the ambient air temperature sensor circuit
0171-04	Ambient Air Temperature voltage low	Ambient air temperature sensor voltage low.	Warning	Check the ambient air temperature sensor circuit
0171-11	Ambient Air Temperature Data Lost	No ambient air temperature data.	Warning	Check the ambient air temperature sensor circuit
0174-00	High Fuel Temperature Warning	High fuel temperature warning. Flash code 65.	Warning	Check the fuel temperature sensor and fuel system
0174-03	Fuel Temperature voltage high	Fuel temperature sensor voltage high. Flash code 13.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0174-04	Fuel Temperature voltage low	Fuel temperature sensor voltage low. Flash code 13.	Warning	Perform "Engine Temperature Sensor Open or Short Circuit - Test"
0190-00	Engine Overspeed Warning	Engine overspeed warning. Flash code 35.	Warning	Check the engine speed/timing sensors
0190-12	Primary Engine Speed loss of signal	The signal for the primary engine speed/timing sensor is lost. Flash code 34.	Warning	Perform "Engine Speed/Timing Sensor Circuit - Test"
0191-07	Transmission Not Responding	Transmission not responding. Flash code 68.	Warning	Check the transmission and data link
0224-11	Theft Deterrent Active	The theft deterrent is active. Flash code 00.	Warning	Enter the theft deterrent password
0224-14	Theft Deterrent Active with Engine Cranking	The theft deterrent is active with the engine cranking. Flash code 00.	Warning	Enter the theft deterrent password
0231-02	J1939 Data Incorrect	Incorrect data on the J1939 data link. Flash code 58.	Warning	Perform "ATA (SAE J1587 / J1708) Data Link Circuit - Test" / check J1939 data link
0231-11	J1939 Data Link Fault	J1939 data link fault. Flash code 58.	Warning	Check the J1939 data link
0231-12	J1939 Device Not Responding	A J1939 device is not responding.	Warning	Check the J1939 data link and device
0232-03	5 Volt Supply voltage high	5 volt supply voltage high. Flash code 21.	Warning	Check the 5 volt supply and sensor circuits
0232-04	5 Volt Supply voltage low	5 volt supply voltage low. Flash code 21.	Warning	Check the 5 volt supply and sensor circuits
0246-11	Brake Pedal Switch #1 Fault	Brake pedal switch #1 fault. Flash code 00.	Warning	Perform "Service Brake Pedal Position (Switch 1) Circuit - Test"
0247-11	Brake Pedal Switch #2 Fault	Brake pedal switch #2 fault. Flash code 00.	Warning	Check the service brake pedal position switch #2 circuit
0249-11	J1922 Data Link Fault	J1922 data link fault. Flash code 58.	Warning	Check the J1922 data link
0252-11	Engine Software Incorrect	Incorrect engine software. Flash code 59.	Warning	Perform "ECM Memory - Test"
0253-02	Check Customer or System Parameters	Customer or system parameters are not programmed. Flash code 56.	Warning	Program FLS, FTS, Vehicle Speed Calibration, Rating Number, Engine Serial Number and Injector Codes Calibration
0253-11	Check Transmission Customer Parameters	Transmission customer parameters must be programmed. Flash code 56.	Warning	Program the transmission customer parameters

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Alignment Of Electric Sets With Supports At The Flywheel Housing / Installation Of A New Generator Or Flexible Plates adjustment

Tools: crane, dial indicator, shims, torque wrench

Loosen all bolts connecting base to foundation; loosen all bolts fastening engine supports and generator supports to base.
Ensure enough clearance between bolts and bolt holes in base, engine supports, generator supports at all locations.
Check clearance between base and foundation at all mounting locations; use shims to prevent deflection; tighten base-to-foundation bolts to final torque.
While generator supported by crane, loosen all bolts (2) fastening generator to flywheel housing; tighten alternate bolts to final torque; check clearance between base and engine and generator support
Tighten all bolts fastening engine supports and generator supports to base to half of final torque; loosen all bolts (2); measure gap between generator and flywheel housing; ensure bolts centered in c
Gaps at (E), (F), (G), (H) should be more than 0.03 mm (0.001 inch) and less than 0.13 mm (0.005 inch); adjust shims or move rear of generator right or left.
After shim correction, tighten generator support bolts to half of final torque 450 N-m (332 Ib ft); check gaps; repeat until 0.13 mm (0.005 inch) or less; begin with Step 5.
Install dial indicator on base with tip next to support mounting bolt (4); put tip on support (3); check while tightening bolt to final torque; if indicator moves more than 0.13 mm (0.005 inch), insta

Alignment Of Electric Sets Without Supports At The Flywheel Housing adjustment

Tools: shims, torque wrench

Loosen all bolts connecting base to foundation; loosen all bolts fastening generator supports and engine supports to base.
Ensure clearance between bolts and bolt holes in base, engine supports, generator supports at all locations.
Check clearance between base and foundation at all mounting locations; use shims to prevent base deflection; tighten base-to-foundation bolts to final torque.
Check clearance between base and engine, base and engine supports, base and generator supports over entire length; use shims to prevent support deflection; tighten all mounting bolts to final torque.

Alternator Belt - Inspect/Adjust/Replace adjustment

⚠ Replace belts for multiple groove pulleys in matched sets.

Tools: Belt tension gauge (110 N / 25 lb force)

Remove the belt guard.
Loosen mounting bolt (2) and adjusting nuts (1).
Turn adjusting nuts to increase or decrease belt tension.
Check deflection is 13 to 19 mm with 110 N applied midway.
Tighten the adjusting nuts; tighten the mounting bolt.
Reinstall the belt guard.
Check adjustment again after 30 minutes at rated rpm if new belts.

Electronic Unit Injector - Adjust adjustment

Tools: 9U-7227 Injector Height Gauge

Put the No. 1 piston at the top center position on the compression stroke.
Use the 9U-7227 injector height gauge to obtain a dimension of 78.0 + 0.2 mm (3.07 + 0.01 inch).
Measure from the top of the unit injector to the machined ledge of the fuel injector body.
Turn the unit injector adjusting screw clockwise until the correct height is obtained.
Hold the adjusting screw in this position and tighten the locknut to 100 + 10 N·m (74 + 7 lb ft).
For cylinders 1, 2, and 4, remove the timing bolt and turn the flywheel 360 degrees in the direction of engine rotation.
Engine rotation is counterclockwise as viewed from the flywheel end; this puts No. 1 piston at top center on the exhaust stroke.
Repeat Steps 3 through 4.
Remove the timing bolt from the flywheel and reinstall the valve mechanism cover.

Engine Oil Level Gauge - Calibrate adjustment

Tools: Marking pen

Operate engine until normal operating temperature is achieved; stop engine; remove a crankcase drain plug and drain oil pan completely.
Remove used engine oil filter; install new filter; install drain plug; tighten to 70 ± 14 N·m (50 ± 10 lb ft).
Add recommended oil: Standard Sump 45.4 L (48 qt); Deep Sump 64 L (68 qt).
Start engine; ensure lubrication system and new filter are filled; inspect for leaks.
Stop engine; allow oil to drain into crankcase approximately five minutes.
Check oil level; use a marking pen to engrave ADD mark (Y).
Add 3.8 L (4 qt) recommended oil; full volume now 49.2 L (52 qt) standard sump or 68.1 L (72 qt) deep sump; allow to drain five minutes.
Check oil level; use a marking pen to engrave FULL mark (X).

Engine Valve Lash - Inspect/Adjust adjustment

⚠ Ensure that the engine can not be started while this maintenance is being performed.

⚠ Hot engine components can cause burns; allow additional time for the engine to cool before measuring/adjusting valve lash clearance.

Initial valve lash adjustment on new, rebuilt, or remanufactured engines is recommended at the first scheduled oil change.
Adjust the electronic unit injector (preload) at the same interval as the valve lash adjustment.
Only qualified service personnel should perform this maintenance.

Fuel Injector - Inspect/Adjust adjustment

⚠ Only qualified service personnel should perform valve lash maintenance.

Tools: 9U-7227 Injector Height Gauge

Inspect the injector mechanism for signs of wear.
Put the No. 1 piston at the top center position on the compression stroke.
Use the 9U-7227 Injector Height Gauge to obtain 78.0 ± 0.2 mm (3.07 ± 0.01 inch) from top of unit injector to machined ledge of fuel injector body.
Turn unit injector adjustment screw clockwise until the correct height is obtained.
Hold adjustment screw and tighten locknut to 100 ± 10 N·m (75 ± 7 lb ft).
For cylinders 1, 2, 3, 7, 8, and 10 remove the timing bolt; turn flywheel 360 degrees counterclockwise (viewed from flywheel end) to put No. 11 piston at top center.
Repeat adjustment steps 3 through 4.
Remove timing bolt from flywheel; reinstall valve mechanism covers.

Rechecking The Alignment adjustment

Tools: torque wrench, shims

Loosen the sixteen close coupled adapter bolts (2); visually ensure they are centered in clearance holes.
Check gaps at 3, 6, 9, and 12 o'clock positions; use 2, 4, 8, and 10 o'clock if 12 and 6 are inaccessible.
If gaps are between 0.03 mm (0.001 inch) and 0.13 mm (0.005 inch), tighten all bolts; alignment check complete. If not, loosen bolts fastening generator to base frame; adjust shims; move rear of gener
After adjustment, tighten generator mounting bolts to one half of standard torque 450 N-m (332 lb ft); repeat procedure starting with Step 1.

VR3 Regulator Adjustment Procedure adjustment

⚠ The VR3 regulator is protected by a fuse(s) and a solid-state overcurrent protection. If a fuse becomes open, contact a Caterpillar dealer.

Remove the access panel of the generator.
Loosen the locknut on the voltage droop potentiometer (1).
Remove the protective screw from the voltage level potentiometer (2) and from the voltage gain potentiometer (3).
Turn the voltage droop potentiometer (1) counterclockwise to zero droop. Tighten the locknut.
Turn the voltage gain potentiometer (3) counterclockwise to zero, then to about 1/4 of full range of clockwise travel.
Perform required maintenance on the engine before you start the engine.
Start the engine and allow the engine to warm up.
Increase engine speed to full governed rated speed (high idle).
Set the no-load voltage with the voltage level potentiometer (2) or the voltage adjust rheostat.
Close the load circuit breaker and apply full load gradually. Adjust governor control to nameplate frequency or rated speed.
If the voltmeter reading increases above no-load voltage, turn the voltage gain potentiometer counterclockwise. If it decreases, turn it clockwise.
Remove the load. If necessary, adjust the voltage level potentiometer (2) to obtain desired voltage.
Apply the load. Repeat Steps 10 through 12 until the voltage at no load equals the voltage at full load.
Tighten the locknuts. Install the protective screws and the access panel of the generator.

Determining the cause of a plugged fuel filter (ice or wax) diagnostic

Remove the fuel filters.
Cut the fuel filters open.
Inspect the fuel filter before the filter warms. The inspection will show that the filter is filled with particles of either ice or wax.

Generator Set Functional Test diagnostic

⚠ Do not operate the generator set at a speed higher than one-half of the rated speed.

Tools: 6V-7070 Digital Multimeter, 12 VDC battery, Potential Transformer

Stop the generator. Connect the potential transformer's high voltage winding to generator terminals T1 and T2. Connect the voltmeter to the low voltage winding.
Disconnect wires F1+ and F2- from the voltage regulator. Disconnect the generator from the load.
Connect a 12 VDC automotive battery to wires F1+ and F2-.
Operate the generator set at half the rated speed.
Measure the AC voltage across the low voltage terminals corresponding to T1-T2, T2-T3, and T3-T1. Record the voltages.
Monitor the voltage between any two locations, then decrease the generator set speed by 10 percent and increase it by 10 percent.
The measured voltages should be nearly equal and should measure a minimum of 85 VAC.
When speed is decreased by 10 percent the voltages should decrease by 10 percent; when increased by 10 percent the voltages should increase by 10 percent.

Load Bank Test diagnostic

Warm Up
Start
15 Min
30 Min
45 Min
1 Hour
Cool Down

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
	3	Delta - 6 lead	6	Winding pitch must be two-thirds or the generator must be derated.
	3	Wye - 10 lead (high voltage)	10	Illustration 13. Only used on 3306B generator sets and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 10 lead (low voltage)	10	Only used on 3306B and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 12 lead (high voltage)	12	Terminals T10, T11, and T12 become neutral connections when tied together.
	3	Wye - 12 lead (low voltage)	12	Terminals T10, T11, and T12 become neutral connections when tied together.
	3	Wye - 4 lead	4	Only used on 3306B generator sets and 3406C generator sets. Terminal T0 is the neutral lead.
	3	Wye - 6 lead	6	Terminals T4, T5, and T6 become neutral connections when the terminals are tied together.
	three-phase	10 Lead Wye Configuration - High Voltage	Terminal T0 is the neutral lead	For 3306B and 3406C generator sets only
	three-phase	10 Lead Wye Configuration - Low Voltage	Terminal T0 is the neutral lead	For 3306B and 3406C generator sets only
	three-phase	12 Lead Delta Configuration	Terminals T6 and T9 become the neutral connection when tied together and grounded; T2 and T10 connection is the high phase
	three-phase	12 Lead Wye Configuration - High Voltage	Terminals T10, T11 and T12 become neutral connection when tied together
	three-phase	12 Lead Wye Configuration - Low Voltage	Terminals T10, T11 and T12 become neutral connection when tied together
	three-phase	4 Lead Wye Configuration	Terminal T0 is the neutral lead	For 3306B and 3406C generator sets only
	three-phase	6 Lead Delta Configuration
	three-phase	6 Lead Wye Configuration	Terminals T4, T5 and T6 become neutral connection when tied together
240	3	Delta - 12 lead	12	Terminals T6 and T9 become the neutral connections when tied together and grounded. T2 and T10 connection is the high phase. 240 V, 60 Hz, three-phase: 208 Volts between the high phase and neutral; 240 Volts between either of the low phases and neutral.
240	three-phase	Delta Configuration (60 Hz, 12 Lead)	T6 and T9 neutral when tied together and grounded	208 Volts between high phase and neutral; 240 Volts between either low phase and neutral
480	three-phase	Wye Configuration (typical series Wye, 60 Hz, 12 Lead)	T10, T11, T12 neutral when tied	For 3406E, 3412C and 3500 series generator sets only - high voltage
480V	3		12 lead reconnectable	Generator end is 12 lead reconnectable: Yes

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Parts cataloged across the Caterpillar 3412E family

216

Part #	Description	Category
102-9720	Cleaning Kit (detergent and oil for AIRSEP air cleaner elements)	Air filter
106-3973	Air filter inner	Air filter
142-1404	Air filter inner	Air filter
4N0015	Air filter outer	Air filter
55.3	Air cleaner, single-stage, dry type	Air filter
7E4254	CLEANER GP - AIR	Air filter
8N6309	Air filter outer	Air filter
5N5692	CHARGING ALTERNATOR 24V 45 AMP	Alternator
PA5346	CHARGING ALTERNATOR 24V 45 AMP	Alternator
1167846	DIGITAL VOLTAGE REGULATOR	Avr
164-4599	V-belt	Belt
6N6798	V-belt	Belt
9L6639	V-belt	Belt
M-7W6129	Alternator, V, .63in (15.9mm) - 80.00in (2032mm)	Belt
M-9L6639	Alternator, V, .63in (15.9mm) - 57.01in (1448mm)	Belt
111-2369	Maintenance Element	Coolant filter
1R-1712	Standard Efficiency Fuel Filter	Filter
101-2844	1 gallon (3.8L)	Fluid
119-5152	Cat Engine Oil (quart bottle)	Fluid
1U-5490	Hydrosolv 4165 liquid cleaner, 19 L (5 US gallon)	Fluid
5N-5561	Silicone Lubricant	Fluid
133-5673	Fuel/Water Separator	Fuel filter
1R-0749	Fuel Secondary - ADV	Fuel filter
1R-0750	High Efficiency Fuel Filter	Fuel filter
1R0749	Filter fuel	Fuel filter
1R0751	Fuel Filter (secondary)	Fuel filter
326-1641	Axial seal FWS	Fuel filter
326-1642	Filter water separator	Fuel filter
326-1643	Filter water separator	Fuel filter
326-1644	Filter water separator	Fuel filter
3S3875	Filter fuel	Fuel filter
8H7204	PRIMARY FUEL FILTER	Fuel filter
PL1697	PRIMARY FUEL FILTER	Fuel filter
1282922CAT	Water Pump Gasket Set - 0.4 lbs/ 0.18 kgs, 5" Length, 27mm Width, 27mm Depth, 11 Application: 3400	Gasket
138-4611	Gasket exhaust manifold	Gasket
1425868CAT	Crankshaft Oil Seal Group Gasket - Rear, 3400, 0.7 lbs/ 0.31 kgs, 17mm Length, 5" Width, 17mm Depth; Flanged Face Sleeve	Gasket
153-9653	Gasket cylinder head	Gasket
1539653CAT	Cylinder Head Gasket - 3406E; ESN's: 1LW0001-00229; 2SW0001--0405; 5DS0001-00048; 6TS0001-20554; 5EK 0001-up	Gasket
1609874CAT	Single Cylinder Liner Gasket Set - 3406/ 3412 0.1 lbs/ 0.04 kgs	Gasket
1669144CAT	Housing Gasket - Front, 3406E	Gasket
2161252CAT	Single Cylinder Head Gasket Set - 3406/ 3406E	Gasket
2245122CAT	Cylinder Head Gasket - 3406E	Gasket
2486744CAT	Single Cylinder Head Gasket Set - 5.6 lbs/ 2.54 kgs, For Use On C-9 MFF; 3406E 1LW; 3406E 1mm, 3406E 2WS; 3406E 5DS; 3406E 6TS	Gasket
3406462MCBCAT	Inframe Chassis Gasket Set - 3406E 5EK	Gasket
4N1151	Gasket oil pan	Gasket
DM-3E3305	GASKET SET, WP OH 3412	Gasket
DM-8C4402	GASKET SET, FUEL SYSTEM 3412	Gasket
M-1252107	Fuel System Set	Gasket
M-1282922	Water Pump Mounting Gasket	Gasket
M-1415787	Oil Cooler Set	Gasket
M-1429672	Central & Lower Set	Gasket
M-1609874	Gasket Set - Cylinder Liner Packing	Gasket
M-2088350	Air Compressor Set	Gasket
M-2323679	Rear Structure Set	Gasket
M-2410825	Turbocharger Installation Set	Gasket
M-3639020	Gasket Set - Central & Lower	Gasket
M-3639024	Gasket Set - Rear Structure	Gasket
M-3648129	Gasket Set - Rear Structure	Gasket
M-3648338	Gasket Set - Front Structure	Gasket
M-3766577	Front Structure Set	Gasket
M-4359418	Gasket Set - Front Structure	Gasket
M-4499116	Gasket Set - Front Structure	Gasket
M-4599781	Gasket Set - Oil Cooler & Lines	Gasket
M-4600714	Gasket Set - Central & Lower	Gasket
M-4600735	Gasket Set - Rear Structure	Gasket
M-4600780	Gasket Set - Single Cylinder Head	Gasket
M-4620795	Gasket Set - Oil Cooler & Lines	Gasket
M-4627233	Gasket Set - Rear Structure	Gasket
M-4679007	Gasket Set - Rear Structure	Gasket
M-4711663	Gasket Set - Central & Lower	Gasket
M-4N1151	Oil Pan Gasket	Gasket
M-4N1151-6	Oil Pan Gasket	Gasket
M-5P5678-6	Valve Cover Gasket	Gasket
M-5P5678-9	Valve Cover Gasket	Gasket
MC1F7C2888CAT	Inframe Overhaul Kit - 3406E 5EK	Gasket
MCB3406461	Overhaul Gasket Set	Gasket
MCB3406462	In-Chassis Gasket Set	Gasket
MCB3406463	Cylinder Head Gasket Set	Gasket
MCB3406463CAT	Cylinder Head Gasket Kit - 3406E 5EK	Gasket
MCB3406471	Overhaul Gasket Set	Gasket
MCB3406472	In-Chassis Gasket Set	Gasket
MCB3406473	Cylinder Head Gasket Set	Gasket
MCB3406473CAT	Cylinder Head Gasket Kit - 3406E LLW 2WS 5DS 6T	Gasket
MCBC15993	Cylinder Head Gasket Set	Gasket
3T8705	Glow plug	Glow plug
3T8706	Glow plug	Glow plug
3N6668	FLEXIBLE FUEL LINES	Hose
1R0741	Filter hydraulic	Hydraulic filter
3N8449	IMPELLER	Impeller
IMP0026	IMPELLER	Impeller
8S-2245	Injection Cleaning Tool Group	Injector
R-10R0955	Fuel Injector - Reman	Injector
R-10R0956	Fuel Injector - Reman	Injector
R-10R1000	Fuel Injector - Reman	Injector
R-10R1273	Fuel Injector - Reman	Injector
R-10R2780	Fuel Injector - Reman	Injector
R-10R3261	Fuel Injector - Reman	Injector
R-10R3265	Fuel Injector - Reman	Injector
R-10R6163	Fuel Injector - Reman	Injector
R-10R8501	Fuel Injector - Reman	Injector
9U-7227	Injector Height Gauge	Injector height gauge
296-8325	Crankcase Ventilation (CV) Filter	Ocv filter cartridge
102-2828	Filter oil	Oil filter
10R-9557	Oil Filter	Oil filter
175-7546	Oil Filter Cutter	Oil filter
1R-0713	Oil Filter (Engine) (Alternative)	Oil filter
1R-0716	Engine Oil	Oil filter
1R-1808	Engine Oil - ADV	Oil filter
1R0716	Filter oil	Oil filter
1R1808	Filter oil	Oil filter
9M9740	Filter oil	Oil filter
124-2946	Lifting Bracket	Service part / kit
128-4124	Kit without Conditioner	Service part / kit
1343761CAT	Piston Ring - Top, 3406E	Service part / kit
163-1128	Kit with Liquid	Service part / kit
163-1129	Kit with Element	Service part / kit
169-8373	Fluid Sampling Bottle	Service part / kit
16CM43-0001	Cylinder Head Assembly	Service part / kit
16CM43-0002	Piston Assembly	Service part / kit
16CM43-0003	Connecting Rod Assembly	Service part / kit
16CM43-0004	Crankshaft Assembly	Service part / kit
16CM43-0005	Valve Train Assembly	Service part / kit
174-6854	Hydrosolv 100 liquid cleaner, 19 L (5 US gallon)	Service part / kit
1765749CAT	Piston Ring - Intermediate, 3406E	Service part / kit
177-9778	Base	Service part / kit
1899771CAT	Oil Control Piston Ring - Intermediate, 3406E/ C15	Service part / kit
195-1068	Base	Service part / kit
1U-8760	Chain Wrench	Service part / kit
206-5756	PrimeTime Prime Only Configuration Kit	Service part / kit
256-0326	Oxidation Catalyst Assembly - Round	Service part / kit
304-7755	Cat Regeneration System	Service part / kit
305-2389	Wire Brush	Service part / kit
4C-9301	Coolant Conditioner Test Kit	Service part / kit
4P7610	PICK UP GP - MAGNETIC	Service part / kit
5P-3413	Pipe Sealant	Service part / kit
6N8878	FUEL PRESSURE GAUGE	Service part / kit
703493	SHAFT	Service part / kit
7C3874	BATTERY CHARGER 10 AMP	Service part / kit
7E6248	HEATER GP - JACKET WATER	Service part / kit
7L7872	24 VOLT BATTERY SET	Service part / kit
7N3229	Connecting rod	Service part / kit
8N1728	Connecting rod	Service part / kit
8T-5296	Coolant Conditioner Test Kit	Service part / kit
8T1589	Maintenance Charge	Service part / kit
8T9190	Refill Charge	Service part / kit
9S-3263	Thread lock	Service part / kit
9Y6054	Connecting rod	Service part / kit
DZ111166	(3402) (3404) (3408) (3409) (974G)	Service part / kit
DZ114695	DEF TANK INLET SCREEN	Service part / kit
LEHW0155-01	CATERPILLAR® ENGINE SPECIFICATIONS	Service part / kit
M-2477133	1 Regulator - 190ºC	Service part / kit
M-2485513	1 Regulator - 180ºC	Service part / kit
M-3327309	Camshaft	Service part / kit
MRS3406E2CAT	Ring Set - 3406E	Service part / kit
PA5399	JACKET WATER HEATER	Service part / kit
PEHP3036	Cat Reman Short and Long Blocks	Service part / kit
PEHP3036-01	Cat Reman Short and Long Blocks	Service part / kit
SHA0048	SHAFT	Service part / kit
135-4925	Water pump	Pump
1354925CAT	New Water Pump - 3406E	Pump
137-1339	Water pump	Pump
161-4111	Oil pump	Pump
161-4113	Oil pump	Pump
1615719CAT	New Water Pump - fits 3406E & C15	Pump
1U-5718	Vacuum Pump	Pump
352-0211	Water pump	Pump
384-8611	Lift/transfer pump	Pump
384-8612	Lift/transfer pump	Pump
703613	PUMP ASSY	Pump
DM-6I3890	WATER PUMP 3406E	Pump
JPR-CT3412	PUMP ASSY	Pump
M-1052508	1 Fuel Priming Pump	Pump
M-1354925	Water Pump	Pump
M-1375541	1 Fuel Priming Pump Tall	Pump
M-1614113	Oil Pump	Pump
M-1615719	Water Pump	Pump
M-3848611	Pump - Transfer	Pump
M-4N733	Oil Pump	Pump
RW6012XM1DRMAN	Reman Water Pump - 3406E	Pump
RW6014XM1DRMAN	Reman Water Pump - Cat 3406E Straight Teeth	Pump
142-5867	Front seal	Seal
142-5868	Rear seal	Seal
1422329CAT	Drainback Seal - 3406E	Seal
4W3864	Water pump seal	Seal
5N2902	OIL SEAL	Seal
5N6055	M-SEAL	Seal
JMK0002	SEAL KIT	Seal
M-1425867	Front Crankshaft Seal	Seal
M-1425868	Rear Crankshaft Seal	Seal
M-1632478	6 6 Valve Stem Seal - Exhaust	Seal
M-2274239ORK	Injector Sleeve O-Ring Kit	Seal
M-2287094	Nose O-ring	Seal
M-2481394	Injector O-Ring Kit	Seal
M-3S9643	1 Regulator Seal	Seal
M-5S2106	Fan Hub Seal	Seal
M-7F2122	Fan Hub O-Ring Seal	Seal
MCSSET0009	M-SEAL	Seal
RET0020	OIL SEAL	Seal
1113794	COOLANT LEVEL SENSOR	Sensor
3N7442	LOW WATER TEMPERATURE SWITCH	Sensor
4P-7610	Magnetic Pickup Group (engine speed/timing sensor in flywheel housing)	Sensor
9G8010	Switch	Sensor
M-1946722	Sensor - Pressure	Sensor
M-1946724	Sensor - Pressure	Sensor
M-1946725	Sensor - Pressure	Sensor
M-2244536	Sensor - Pressure	Sensor
M-2566453	Sensor - Temperature	Sensor
M-2644297	Sensor - Temperature	Sensor
M-2842728	Sensor - Pressure	Sensor
4N1061	ELECTRIC STARTING MOTOR LH 24V	Starter
247-7133	Thermostat	Thermostat
248-5513	Thermostat	Thermostat
M-4W4011	Regulator - 170°	Thermostat
16CM43-0006	Turbocharger Assembly	Turbocharger
7C7691	Turbocharger	Turbocharger
PEHP7069-01	Reman Water Pump	Water pump

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Aftermarket parts that fit this engine

348-6693 FridayParts $275.56 218-9901 FridayParts $88.10 171-2212 FridayParts $75.99 3E-6466 FridayParts $73.99 162-2073 FridayParts $73.99 147-7975 FridayParts $217.50 139-4724 FridayParts $53.20 5P-8309 FridayParts $48.90 3E-0156 FridayParts $15.78 SinoCMP $29.00 122-6585 FridayParts $123.56 2W-6593 FridayParts $999.75 9N-2380 FridayParts $325.56 124-5572 KuduParts $50.00 FridayParts $52.10 150-1388 FridayParts $1249.99 189-0202 eBay $60.00 FridayParts $79.99 166-1681 FridayParts $79.99 251-7222 KuduParts $145.00 FridayParts $150.00 2G-1034 FridayParts $13.66 4D-2287 FridayParts $39.92 8M-3368 FridayParts $27.20 334-5006 FridayParts $769.56 160-8178 FridayParts $218.89 379-8869 FridayParts $218.89 0R-0916 FridayParts $218.89 171-8708 FridayParts $97.58 9Y-2988 FridayParts $40.68 142-5867 eBay $41.66 FridayParts $39.38 197-9322 FridayParts $92.88 6Y-7934 FridayParts $20.88 4N-2572 FridayParts $262.16 137-2429 FridayParts $98.59 145-6034 FridayParts $359.99 179-6863 FridayParts $489.99 297-9545 FridayParts $339.89 297-9546 FridayParts $499.99 341-8543 FridayParts $135.99 365-4922 FridayParts $319.99 6V-2696 FridayParts $68.41 7T-0157 FridayParts $68.41 6Y-0858 FridayParts $95.99 6Y-0857 FridayParts $95.99 9G-5321 FridayParts $89.99 9W-6692 FridayParts $89.99 1R-0749 Amazon Amazon eBay $135.88 eBay $135.88 NAPA $28.51 NAPA $28.51 KuduParts $17.00 FridayParts $47.50 111-7916 FridayParts $455.99 232-1170 FridayParts $547.80 170-0061 FridayParts $29.99 KuduParts $39.00 133-5673 Amazon eBay $19.99 eBay $19.99 NAPA $70.35 KuduParts $19.00 FridayParts $20.99 513-4490 Amazon eBay $23.43 PartsGeek $48.97 FridayParts $29.99 KuduParts $39.00 129-0375 KuduParts $22.00 FridayParts $24.26 4N-9680 FridayParts $28.99 931G 185-7688 FridayParts $65.99 148-8977 FridayParts $5865.50 158-8987 KuduParts $50.00 FridayParts $52.56 126-1813 KuduParts $50.00 FridayParts $52.56 SinoCMP $149.00 121-4311 FridayParts $2039.89 121-4312 FridayParts $2039.89 159-7744 KuduParts $65.00 FridayParts $67.95 9T-9227 FridayParts $72.88

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Filters for this engine

Air filter: Caterpillar 7T1S90 Caterpillar 1063973 Caterpillar 612506 Caterpillar 2310167 Donaldson P525026 Donaldson P533884 Donaldson P532506 Donaldson P827653
Fuel filter: Caterpillar 1165436 Caterpillar 5134490 Caterpillar 3089679 Caterpillar 3890433 Donaldson P550625 Donaldson P551858 Donaldson P551311 Donaldson P551316
Oil filter: Caterpillar 2P4005 Donaldson P554005 Wix 51792 Ac Delco PF879L

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Also used in

Caterpillar 5110 — Excavator Tracked
Caterpillar 773E — Haul Truck
Caterpillar 775E — Haul Truck
Caterpillar 992C — Loader Wheeled
Caterpillar 992D — Loader Wheeled
Caterpillar D10N — Tractor Tracked
Caterpillar D10R — Dozer Tracked
Caterpillar D9L — Tractor Tracked
Manitowoc 4599 SERIES 4 — Dragline

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Caterpillar 3412E?

The Caterpillar 3412E engine has an oil capacity of 730.0 liters.

What is the displacement of the Caterpillar 3412E?

The Caterpillar 3412E has a displacement of 12.0 liters with 6 cylinders.

Which generators use the Caterpillar 3412E engine?

The Caterpillar 3412E powers 10 generator set(s), including Caterpillar 3406E, Caterpillar 3412, Caterpillar 3412E, Solar Turbines CENTAUR 50, Solar Turbines Centaur 40.

What oil filter does the Caterpillar 3412E use?

The Caterpillar 3412E uses oil filter part numbers Caterpillar 2P4005, Donaldson P554005, Wix 51792.

What fuel filter does the Caterpillar 3412E use?

The Caterpillar 3412E uses fuel filter part numbers Caterpillar 1165436, Caterpillar 5134490, Caterpillar 3089679.

What air filter does the Caterpillar 3412E use?

The Caterpillar 3412E uses air filter part numbers Caterpillar 7T1S90, Caterpillar 1063973, Caterpillar 612506.

How often should you change the oil in the Caterpillar 3412E?

The Caterpillar 3412E oil change interval is every 200 hours.

What is a common problem with the Caterpillar 3412E engine?

A commonly reported issue on generators using the Caterpillar 3412E is: Increased coolant temperature.