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Caterpillar 3306B Engine

Name: Caterpillar 3306B Engine
Brand: Caterpillar

The Caterpillar 3306B is a 10.5 L 6-cylinder turbocharged-aftercooled engine rated at 1200 rpm, producing up to 102 kW. It powers generator sets from Caterpillar. It holds 38.8 L (10.2 gal) of oil and 15.9 L (4.2 gal) of coolant.

Also known as: Caterpillar 3306B

10.5 L

Displacement

Cylinders

1200 rpm

Rated speed

102 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Fluids Procedures Wiring

Engine specifications

Oil capacity	38.8 L
Coolant capacity	15.9 L
Displacement	10.5 L
Cylinders	6
Aspiration	Turbocharged-Aftercooled
Rated speed	1200 rpm
Gross power	102 kW

Generator sets powered by this engine

Caterpillar 3306B

How to read your Caterpillar engine serial & model number →

Troubleshooting

Fault codes

Code	Meaning	Remedy
i01226491	Engine overspeed	Stop the engine by shutting off the fuel supply to the engine and/or shutting off the air supply to the engine.
21	Fault shutdown
22	Fault alarm

Fault codes and symptom→remedy steps extracted from this engine’s service/owner documentation; verify against the official manual before servicing.

Common problems

Fault shutdown 21
Fault alarm 22
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.

Compiled from service & troubleshooting documentation across every generator set that uses the Caterpillar 3306B.

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Coolant		15.9 L	—
Oil	Caterpillar DEO 10W30 or 15W40	38.8 L	—	250 hr

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
Aftercooler Core	Clean	250 hr		Clean/Test - Every 9500 L (2500 US gal) of Fuel or 250 Service Hours or Yearly
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		Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Cooling System Coolant Sample (Level 1)	Test	250 hr		Obtain - Every 250 Service Hours
Cooling System Supplemental Coolant Additive (SCA)	Test	250 hr		Test/Add - Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Engine Crankcase Breather	Clean	250 hr		Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Engine Protective Devices	Check	250 hr		Every 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Engine Valve Lash	Adjust	250 hr		First service — Inspect/Adjust - First 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Magnetic Pickups	Clean	250 hr		First service — Clean/Inspect - First 19 000 L (5000 US gal) of Fuel or 250 Service Hours
Cooling System Coolant Sample (Level 2)	Test	2000 hr	12 mo	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
Cooling System Coolant Extender (ELC)	Other	6000 hr	36 mo	Add - Every 6000 Service Hours or 3 Years
Insulation	Test	7500 hr	12 mo	Every 7500 Service Hours or 1 Year (Standard and Standby schedule)
Rotating Rectifier	Check	7500 hr	12 mo	Every 7500 Service Hours or 1 Year (Standard and Standby schedule)
Cooling System Coolant (ELC)	Change	12000 hr	72 mo	Every 12 000 Service Hours or 6 Years
Bearing (Ball)	Lubricate	2000 hr	12 mo	Every Year (Standby schedule)
Bearing (Spherical Roller)	Lubricate	1000 hr	12 mo	Every Year (Standby schedule)
Fuel System Primary Filter (Water Separator) Element	Replace	500 hr	12 mo	Every Year
Generator Set Vibration	Inspect	2000 hr	12 mo	Every Year (Standby schedule)
Stator Lead	Check	2000 hr	6 mo	Every 6 Months (Standby schedule)

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
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	Coolant level below filler pipe bottom	13	mm
Other	Cooling system fill rate (maximum)	19	L per minute	to avoid air locks
Other	Engine valve rotator operation	should turn slightly when valves close
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	Speed droop values commonly used	3% and 0%	%
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
Pressure	Coolant system pressure test - use 9S-8140 Pressurizing Pump	9S-8140
Pressure	Engine oil pressure at low idle	186 to 344	kPa	low idle speed
Pressure	Fuel pressure (below which engine will not operate properly)	160	kPa
Pressure	Maximum air pressure for cleaning	205	kPa	deadheaded nozzle with chip guarding
Pressure	Maximum water pressure for cleaning	275	kPa
Pressure	Minimum recommended oil pressure	103	kPa	600 rpm
Pressure	Minimum recommended oil pressure	15	psi	600 rpm
Pressure	Normal operating engine oil pressure	275 to 600	kPa	engine running at rated engine speed, SAE 10W30 oil, operating oil temperature 104 C (219.2 F), normal engine water temperature
Pressure	Primary filter/water separator change pressure	50 to 70	kPa	15 to 20 inches Hg
Pressure	Typical engine oil pressure at rated rpm with SAE10W30 (turbocharged)	275 to 606	kPa	rated rpm
Pressure	Typical engine oil pressure at rated rpm with SAE10W30 (turbocharged)	40 to 88	psi	rated rpm
Resistance	Exciter Armature (Rotor) (L2) resistance	less than 0.1	ohm	room temperature
Resistance	Exciter Field (Stator) (L1) resistance	3.0 to 6.0	ohms	room temperature
Resistance	Insulation resistance minimum (contaminated generator)	1	megohm
Resistance	Main Armature (Stator) (L4) resistance	less than 0.1	ohm	room temperature
Resistance	Main Field (Rotor) (L3) resistance	0.75 to 2.0	ohms	room temperature
Resistance	Pilot Exciter Armature (L5) resistance	less than 0.1	ohm	room temperature
Resistance	Varistor (CR7) resistance	minimum 15000	ohms
Speed	Actual RPM of overspeed (1500 full load rpm)	1770	rpm	multiply full load RPM by 1.18
Speed	Actual RPM of overspeed (1800 full load rpm)	2124	rpm	multiply full load RPM by 1.18
Speed	Frequency vs RPM - four-pole generator	divide the RPM by 30	Hz
Speed	Frequency vs RPM - six pole generator	divide the RPM by 20	Hz
Speed	Generator set functional test minimum phase voltage	85	VAC	half rated speed
Speed	Low idle (50 Hz units)	80	percent of full load speed
Speed	Low idle (50 Hz units)	approximately 80	% of full load speed	50 Hz units
Speed	Low idle (60 Hz units)	66	percent of full load speed
Speed	Low idle (60 Hz units)	approximately 66	% of full load speed	60 Hz units
Speed	Magnetic pickup crank termination	400	rpm	starter pinion disengagement
Speed	Overspeed switch setpoint	118	percent of rated engine speed
Speed	Test RPM for overspeed (1500 full load rpm)	1328	rpm	multiply full load RPM by 0.885
Speed	Test RPM for overspeed (1800 full load rpm)	1593	rpm	multiply full load RPM by 0.885
Temperature	Air cleaner oven drying maximum	82	°C
Temperature	Air cleaner wash water maximum	60	°C	soak six hours
Temperature	Bearing reinstall heating	107	C	heat for ten minutes
Temperature	Engine water temperature operating range	88 to 100	C	88 C (190.4 F) to 100 C (212.0 F)
Temperature	Fuel heater maximum fuel supply temperature	37	°C
Temperature	Generator bearing shutdown temperature	50	°C above ambient
Temperature	Generator drying winding temperature ramp rate	10	°C per hour	up to 85 C (185 F)
Temperature	Generator drying winding temperature rise rate	10	C per hour up to 85 C (185 F)	do not apply heat too rapidly
Temperature	Generator oven drying	65	°C	4 hours forced air
Temperature	Hub reinstall heating	400	C	heat for three hours
Temperature	Jacket water coolant temperature (maximum allowable)	104	°C
Temperature	Jacket water coolant temperature (typical)	87 to 98	°C
Temperature	Jacket water heater maintained coolant temperature	32	°C	ambient 0 C (32 F)
Temperature	Oven drying method temperature	65	C	forced air drying oven for four hours
Torque	Air cleaner service indicator	18	lb in
Torque	Air cleaner service indicator	2	N·m
Torque	Fuel line nuts	30 ± 5	lb ft
Torque	Fuel line nuts	40 ± 7	N·m

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	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		58.0 L	Preferred; 1:1 mixture of water and glycol; service life six years; add ELC Extender once
Coolant	Cat NGEC				Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first
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
Engine oil	Cat NGEO				Natural Gas
Engine oil	SAE 10W30				Referenced as the oil used when normal operating engine oil pressure is specified
Engine oil	Cat Arctic DEO SYN SAE 0W-30		-40°C to 30°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 0W-20	Cat DEO Multigrade API CH-4/API CG-4	-40°C to 10°C
Engine oil	SAE 0W-30	Cat DEO Multigrade API CH-4/API CG-4	-40°C to 30°C
Engine oil	SAE 0W-40	Cat DEO Multigrade API CH-4/API CG-4	-40°C to 40°C
Engine oil	Cat DEO SYN SAE 5W-40		-30°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 5W-30	Cat DEO Multigrade API CH-4/API CG-4	-30°C to 30°C
Engine oil	SAE 5W-40	Cat DEO Multigrade API CH-4/API CG-4	-30°C to 50°C
Engine oil	Cat DEO SAE 10W-30		-18°C to 40°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 10W-30	Cat DEO Multigrade API CH-4/API CG-4	-18°C to 40°C
Engine oil	Cat DEO SAE 15W-40		-9°C to 50°C		Engine Crankcase; Industrial Engines
Engine oil	SAE 15W-40	Cat DEO Multigrade API CH-4/API CG-4	-9°C to 50°C
Fuel	No. 1-D or No. 2-D	ASTM D975			Use No. 1 diesel fuel or a blend of No. 1 and No. 2 for cold-weather operation; No. 2 is most commonly used
Grease	Cat Generator Set Grease				Part Number 108-8611
Grease	High Speed Ball Bearing Grease				Fan drive bearing grease fitting
Grease	Multipurpose Grease	1P-0808			Fuel control linkage lubrication
Grease	NLGI No. 1.5 Grade				Caterpillar 108-8611 Grease Cartridge for spherical roller bearings; contains Clay thickener; no molybdenum disulfide; viscosity 32 cSt at 40 C, 5 cSt at 100 C
Grease	NLGI No. 2 Grade		-29°C to 177°C		Caterpillar 2S-3230 Bearing Lubricant for ball bearings; contains Polyurea thickener; for extremely low temperatures use NLGI No. 1 Grade or NLGI No. 0 Grade

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

Procedures

Engine Valve Lash - Inspect/Adjust adjustment

⚠ Hot engine components can cause burns.

⚠ Only qualified service personnel should perform this maintenance.

Ensure the engine cannot be started; do not use the starting motor to turn the flywheel.
Ensure the engine is stopped and allow valves to cool.
Refer to the Systems Operation/Testing and Adjusting Manual for the complete procedure.
Set inlet valve lash to 0.38 mm (0.0150 inch).
Set exhaust valve lash to 0.76 mm (0.030 inch).
Perform initial adjustment at the first scheduled oil change.

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.

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.

Rotating Rectifier - Test diagnostic

Tools: 6V-7070 Digital Multimeter, 146-4080 Digital Multimeter (RS-232)

Touch the red ohmmeter lead to the rectifier terminal marked '+'.
Touch the black ohmmeter lead to terminals AC1, AC2, and AC3; the meter should indicate an open circuit or high resistance.
Touch the black ohmmeter lead to the rectifier terminal marked '+'.
Touch the red ohmmeter lead to terminals AC1, AC2, and AC3; the meter should indicate a good diode or low resistance.
Touch the black ohmmeter lead to the rectifier terminal marked '-'.
Touch the red ohmmeter lead to terminals AC1, AC2, and AC3; the meter should indicate an open circuit or high resistance.
Touch the red ohmmeter lead to the rectifier terminal marked '-'.
Touch the black ohmmeter lead to terminals AC1, AC2, and AC3; the meter should indicate a good diode or low resistance.
If the meter does not indicate the expected result, the rectifier is bad. Replace the rectifier.

Rotating Rectifier - Test (Brushless Exciter) diagnostic

Tools: 6V-7070 Digital Multimeter, 9U-7330 Multimeter, 146-4080 Digital Multimeter (RS-232), 7X-1710 Multimeter Probe Group

Remove the cover from the exciter.
Remove the nut securing the rectifier to the heat sink.
Remove the diode lead and lift the rectifier from the heat sink.
Connect ohmmeter leads across the rectifier and note reading.
Reverse the ohmmeter leads and note reading.
Low resistance one direction and high the other indicates a good rectifier.
Low resistance both directions indicates shorted rectifier.
High resistance both directions indicates open rectifier; replace faulty rectifiers.

Varistor - Test diagnostic

Tools: Ohmmeter, Test Light

Using an ohmmeter, place the ohmmeter across the varistor. The resistance should be a minimum of 15000 ohms.
Disconnect either lead of the varistor (CR7).
Place the test light across the varistor.
Observe the results. The lamp should not light.
Reverse the test light.
Observe the results. The lamp should not light.
If the test light illuminates in either direction, there is a short in the varistor. Replace any faulty varistors with comparable operating characteristics.

Battery - Replace maintenance

⚠ Batteries give off combustible gases which can explode.

⚠ Removing cables with cover in place may cause battery explosion.

Turn key start switch to OFF; remove key and all electrical loads.
Turn OFF and disconnect battery charger.
Disconnect NEGATIVE - cable from NEGATIVE - battery terminal.
Disconnect POSITIVE + cable from POSITIVE + battery terminal.
Remove the used battery.
Install the new battery.
Connect cable from starting motor to POSITIVE + terminal.
Connect cable from ground plane to NEGATIVE - terminal.

Battery Disconnect Switch - Check maintenance

⚠ Never move the battery disconnect switch to OFF while the engine is operating.

With switch ON verify electrical components, hour meter and cranking function.
Turn the battery disconnect switch to the OFF position.
Verify electrical components, hour meter and cranking do not function.
Consult your Caterpillar dealer if any item continues to function.

Bearing (Ball) - Lubricating Process maintenance

Tools: Grease fitting, 8F-9866 Grease gun

Remove either the louver assembly or the rear plate from the rear of the generator housing.
Remove the top grease pipe plug and remove the lower grease pipe plug.
Install a grease fitting in the grease pipe.
Grease the shielded ball bearings with 2S-3230 Bearing Lubricant (53.28 mL (1.8 ounces) to 59.20 mL (2.0 ounces)).
Wipe off the excess grease. Remove the top grease fitting. Install the plug.
Operate the generator for one hour to allow the grease to expand and force excess grease from the cavity.
Stop the engine. Install the plug in the bottom grease pipe and wipe off the excess grease.
Install the louver assembly or install the rear plate.

Cooling System Coolant (DEAC) - Change maintenance

⚠ Pressurized system: hot coolant can cause serious burns.

Tools: 9S-8140 Pressurizing Pump

Stop engine and allow to cool; loosen filler cap slowly and remove.
Open drain valve or remove drain plug; allow coolant to drain.
Flush cooling system with clean water.
Close drain valve; clean and install drain plugs per SENR3130 torques.
Fill with clean water and cleaner; run at low idle minimum 30 minutes at 82 C.
Drain and flush until all cleaning agent is gone.
Fill with coolant/antifreeze; do not install filler cap.
Run engine at high idle 1 minute to purge air; check level and cap.

Engine Oil and Filter - Change maintenance

⚠ Hot oil and hot components can cause personal injury.

Tools: 1U-8760 Chain Wrench, 175-7546 Oil Filter Cutter Gp

Drain crankcase with engine stopped and oil warm.
If no drain valve, remove oil drain plug; clean and install plugs.
Remove oil filter with 1U-8760 Chain Wrench.
Cut filter open with 175-7546 Oil Filter Cutter Gp and inspect for debris.
Clean sealing surface of filter mounting base.
Apply clean engine oil to new oil filter gasket.
Install oil filter; tighten by hand per filter instructions.
Fill crankcase; run at low idle 2 minutes and check level.

Fuel System - Prime maintenance

⚠ Personal injury or death can result from a fire; clean up spilled fuel.

Unlock priming pump; operate until resistance is felt.
Push in plunger and hand tighten.
Crank the engine.
If equipped, open vent valve on fuel injection pump housing.
Operate priming pump until fuel flow is continuous and free of air.
Close vent valve; push in and hand tighten plunger.
If no priming pump, crank engine until fuel flows freely.
Loosen fuel line nuts at valve cover base one at a time; prime until air-free; retighten.

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

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

Aftermarket parts that fit this engine

12Teeth FridayParts $419.99 207-1560 FridayParts $422.25 7G-7889 FridayParts $187.20 20R-3857288-6976 FridayParts $568.89 20R-3857 FridayParts $568.89 2W-1709 FridayParts $93.98 247-7133 Amazon eBay $107.00 eBay $41.00 FridayParts $27.50 9T-7761 FridayParts $159.89 3B-6552 FridayParts $7.51 124-5572 KuduParts $50.00 6I-0273 FridayParts $62.90 P532474 FridayParts $50.88 6I-0274 FridayParts $50.88 6I-2474 FridayParts $50.88 7T-2798 FridayParts $41.23 0R-3404 FridayParts $699.85 6I-2503 Amazon $62.99 eBay $62.99 KuduParts $115.00 6I-2504 eBay $25.99 KuduParts $115.00 140-2246 FridayParts $162.56 391-8229 FridayParts $162.56 8N-1984 Amazon eBay $275.00 FridayParts $114.19 2PCS FridayParts $7.59 2P2696 FridayParts $65.00 1W-9812 KuduParts $84.00 212-5883 FridayParts $156.66 7N-6550 FridayParts $3299.00 1B-7709 FridayParts $19.99 7W-8003 FridayParts $1248.80 133-6350 FridayParts $1301.00 4N-2572 FridayParts $262.16 110-6466 SinoCMP $101.00 6T-4121 FridayParts $102.50 3R-2251 FridayParts $39.99 8N-9803 eBay $33.99 KuduParts $43.00 2W-0256 FridayParts $2720.56 9G-8010 eBay $39.00 FridayParts $16.90 170-0061 FridayParts $29.99 133-5673 Amazon $47.30 eBay $19.99 eBay $19.99 KuduParts $19.00 513-4490 Amazon eBay $23.43 PartsGeek $48.97 FridayParts $29.99 2W-4234 FridayParts $68.83 3I-1169 FridayParts $68.83 129-0375 KuduParts $22.00 298-3648 FridayParts $2650.99 4P-6009 FridayParts $45.26 9T-7757 FridayParts $239.56 238-4462 FridayParts $47.99 376-9011 FridayParts $55.89 376-9017 FridayParts $49.99 9T-5976 FridayParts $912.56 105-3196 FridayParts $912.56 5P-8500 FridayParts $12.75 1W-0613 KuduParts $38.00 5N-8757 FridayParts $359.99 163-8516 FridayParts $57.79 6I-134 FridayParts $299.30 168-4531 FridayParts $113.50 613-5133 FridayParts $2440.86 6I-1872 FridayParts $2440.86 036-1865 FridayParts $35.11 6L-8617 FridayParts $39.59

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

Also used in

Caterpillar 143H — Grader
Caterpillar 637G — Scraper
Caterpillar 65B — Tractor
Caterpillar 70C — Tractor
Caterpillar D6G — Dozer Tracked
Caterpillar D6H — Tractor Tracked
Caterpillar D6H II — Tractor Tracked
Caterpillar D6H II LGP — Tractor Tracked
Caterpillar D6H II XL — Tractor Tracked
Caterpillar D6H II XR — Tractor Tracked
Caterpillar D6H LGP — Tractor Tracked
Steiger COUGAR II — Tractor

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 3306B?

The Caterpillar 3306B engine has an oil capacity of 38.8 liters.

What is the displacement of the Caterpillar 3306B?

The Caterpillar 3306B has a displacement of 10.5 liters with 6 cylinders.

Which generators use the Caterpillar 3306B engine?

The Caterpillar 3306B powers 1 generator set(s), including Caterpillar 3306B.

How often should you change the oil in the Caterpillar 3306B?

The Caterpillar 3306B oil change interval is every 250 hours.

What is a common problem with the Caterpillar 3306B engine?

A commonly reported issue on generators using the Caterpillar 3306B is: Fault shutdown.