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MTU 12V 4000 G23 Engine

The MTU 12V 4000 G23 is a 57.2 L 16-cylinder exhaust turbocharging (etc) and charge air cooling (cac) engine rated at 1500 rpm. It powers generator sets from Kohler, MTU and Talles, including the 1500REOZDD, 12 V 4000 G23, 12V4000 DS1750 and DP 1670 D5S FW. It holds 260 L (68.7 gal) of oil and 160 L (42.3 gal) of coolant.

Also known as: MTU 12V 4000 G23

Part of the MTU 12V4000 engine family — 62 variants share parts & fitment.

57.2 L

Displacement

Cylinders

1500 rpm

Rated speed

260.0 L

Oil capacity

On this pageService parts Specs Generator sets Maintenance Filter cross-reference FAQ Service intervals Torque & specs Fluids Fault codes Procedures Wiring

Service parts for the 12V 4000 G23

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

Fuel system

1 required

P550849Fuel filterfind

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

Engine specifications

Oil capacity	260.0 L
Coolant capacity	160.0 L
Displacement	57.2 L
Cylinders	16
Aspiration	Exhaust turbocharging (ETC) and charge air cooling (CAC)
Rated speed	1500 rpm

Generator sets powered by this engine

Shared across brands: Kohler, MTU, Talles

Kohler 1500REOZDD MTU 12 V 4000 G23 MTU 12V4000 DS1750MTU DP 1670 D5S FWMTU DS 1880 D5S FWMTU TPDSZ12V4000-2A0Talles HMW-1650 T5

How to read your MTU engine serial & model number →

Troubleshooting

Fault codes

Code	Meaning	Remedy
003	HI T-Fuel	Contact Service.
004	SS T-Fuel	Contact Service.
005	HI T-Charge Air	Reduce power. Check intercooler.
006	SS T-Charge Air	Reduce power. Check intercooler.
009	AL L1 T-Coolant	Reduce power.
010	AL L2 T-Coolant	Reduce power. Check intercooler.
015	LO P-Lube Oil	Check oil level, top up as necessary.
016	SS P-Lube Oil	Check oil level, top up as necessary. Attempt to restart engine.
019	HI T-Exhaust A	Check cabling. Contact Service.
020	SS T-Exhaust A	Check cabling. Contact Service.
021	HI T-Exhaust B	Check cabling. Contact Service.
022	SS T-Exhaust B	Check cabling. Contact Service.
023	LO Coolant Level	Check coolant level.
024	SS Coolant Level	Check coolant level.
025	HI P-Diff. Lube Oil	Replace oil filter.
026	HI P-Diff. Lube Oil	Replace oil filter.
027	HI Leak Fuel Level	Check fuel system. Contact Service.
029	HI ETC 2 idle speed	Contact Service.
030	SS Engine Speed	Acknowledge alarm. Attempt to restart engine.
031	HI ETC 1 overspeed	Contact Service.
032	SS ETC 1 overspeed	Reduce power. Check air filters.
036	HI ETC 2 overspeed	Reduce power. Contact Service.
037	SS ETC 2 overspeed	Reduce power. Contact Service.
038	AL ETC Synchro Fault	Reduce power. Contact Service.
039	AL ETC 2 cut-in failure	Reduce power. Contact Service.
044	L1 Coolant Level	Check coolant level.
051	HI T-Lube Oil	Reduce power.
052	SS T-Lube Oil	Reduce power. Check engine oil level
057	LO P-Coolant	Check coolant circuit.
058	SS P-Coolant	Automatic shutdown. Check coolant level.
063	HI P-Crankcase	Reduce power. Replace oil separator element.
064	SS P-Crankcase	Replace oil separator element. Contact Service.
065	LO P-Fuel	Check fuel lines for leaks. Clean and flush fuel prefilter. Replace filter element of fuel prefilter.
066	SS P-Fuel	Check fuel lines for leaks. Clean and flush fuel prefilter. Replace filter element of fuel prefilter.
067	HI T-Coolant	Reduce power.
068	SS T-Coolant	Allow engine to cool down. Check coolant cooler, clean if necessary. Restart engine. Contact Service.
087	AL Rail Leakage	Contact Service.
082	HI P-Fuel (Common Rail pressure > reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty.	Contact Service.
083	LO P-Fuel (Common Rail pressure < reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty.	Contact Service.
084	HI P-Fuel (Common Rail pressure > reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty.	Contact Service.
085	LO P-Fuel (Common Rail pressure < reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty.	Contact Service.
090	SS No Idling Speed	Contact Service.
091	SS No Runup Speed	Contact Service.
092	SS No Starter Speed	Contact Service.
093	SS T-Preheat	Check preheater.
094	LO T-Preheat	Check preheater.
095	AL Prelubrication Fault	Check oil priming system.
102	Consumption Meter Faulty	Contact Service.
104	Eng Hours Counter Defect	Contact Service.
118	LO ECU Supply Voltage	Check ECU supply voltage. Contact Service.
119	LOLO ECU Supply Voltage	Check ECU supply voltage. Contact Service.
120	HI ECU Supply Voltage	Check ECU supply voltage. Contact Service.
121	HIH] ECU Supply Voltage	Check ECU supply voltage. Contact Service.
134	15V POS ECU DEFECT	Replace ECU.
136	15V NEG ECU DEFECT	Contact Service.
142	BANK1 ECU DEFECT	Replace ECU.
144	BANK2 ECU DEFECT	Replace ECU.
150	Li AD-TEST3 SUPPLY	Replace ECU.

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

Common problems

LO P-Fuel (Common Rail pressure < reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty. 083
Fix: Contact Service.
HI P-Fuel (Common Rail pressure > reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty. 082
Fix: Contact Service.
HI P-Diff. Lube Oil 025
Wiring TO 3 SD alarm configuration; short circuit or wire break on transistor output 3 (TO 3) 373 AL
Wiring TO 2 SD alarm configuration; short circuit or wire break on recirculation transistor output 2 (TO 2). 372 AL
Fix: 1. Check turbocharger valve/cabling, repair as necessary. 2. Replace ECU.
Wiring TO 1 SD alarm configuration; short circuit or wire break on turbocharger transistor output 1 (TO 1). 371 AL
Fix: 1. Check turbocharger valve/cabling, repair as necessary. 2. Replace ECU.
Violation of second limit for external temperature channel 2 point, which is read via CAN bus 072
Violation of second limit for external temperature channel 1 point, which is read via CAN bus 070
Violation of second limit for external pressure channel 2 point, which is read via CAN bus 076
Violation of second limit for external pressure channel 1 point, which is read via CAN bus 074
Violation of first limit for external temperature channel 2 | (Depending on the corresponding measuring point, which is read via CAN bus) 071
Violation of first limit for external temperature channel 1 point, which is read via CAN bus 069
Violation of first limit for external pressure channel 2 point, which is read via CAN bus 075
Violation of first limit for external pressure channel 1 point, which is read via CAN bus 073
Stop Power Stage SD alarm configuration; internal electronic fault (electronics possibly faulty: start ITS). If the ITS diagnosis result is “electronics OK 363 AL
Fix: 1. Check cabling. 2. Attempt to restart engine.

Compiled from service & troubleshooting documentation across every generator set that uses the MTU 12V 4000 G23.

Maintenance schedule

Item	Spec	Part #
Fuel filter	double walled fuel injection pipes with leakage monitoring, Racor 75/1000FHX model duplex pre-filter	33763	Amazon eBay $29.99 PartsGeek $29.97 NAPA $43.99
Oil filter	lube oil filters multi stage	—
Belt	resilient coupling between engine and generator, air filter mountings and flexible engine-filter connections	—
Oil	lube oil heat exchanger, lube oil filters multi stage, lube oil centrifuge	—
Spark plug	individual cylinder heads with exhaust valve rotators “Rotocap”	—

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

Repair guides

Step-by-step procedures compiled from the MTU service manual for this engine.

Service intervals

Item	Action	Hours	Months	Notes
Engine coolant	Change		12 mo	If engine is out of service for more than one year, change engine coolant and charge-air coolant
Valve gear	Lubricate		6 mo	Lubricate valve gear every 6 months (out-of-service >3 months procedure)

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	Centrifugal oil filter maximum layer thickness of oil residues	45	mm	if exceeded, shorten maintenance interval
Clearance	Valve clearance adjustment trigger deviation	0.1	mm	if deviation from reference value exceeds this
Clearance	Valve clearance deviation from reference value (adjustment threshold)	0.1	mm
Other	10 in. weld flange bolt circle diameter B	361.95	mm (14.25 in.)
Other	10 in. weld flange outside diameter C	406.4	mm (16.0 in.)
Other	10 in. weld flange quantity of bolts / bolt hole diameter D	12, 25.40	mm (1.00 in.)
Other	12 in. weld flange bolt circle diameter B	431.80	mm (17.00 in.)
Other	12 in. weld flange outside diameter C	482.6	mm (19.0 in.)
Other	12 in. weld flange quantity of bolts / bolt hole diameter D	12, 25.40	mm (1.00 in.)
Other	14 in. weld flange bolt circle diameter B	476.25	mm (18.75 in.)
Other	14 in. weld flange outside diameter C	533.4	mm (21.0 in.)
Other	14 in. weld flange quantity of bolts / bolt hole diameter D	12, 28.58	mm (1.13 in.)
Other	16 in. weld flange bolt circle diameter B	539.75	mm (21.25 in.)
Other	16 in. weld flange outside diameter C	596.9	mm (23.5 in.)
Other	16 in. weld flange quantity of bolts / bolt hole diameter D	16, 28.58	mm (1.13 in.)
Other	18 in. weld flange bolt circle diameter B	577.85	mm (22.75 in.)
Other	18 in. weld flange outside diameter C	635.0	mm (25.0 in.)
Other	18 in. weld flange quantity of bolts / bolt hole diameter D	16, 31.75	mm (1.25 in.)
Other	20 in. weld flange bolt circle diameter B	635.00	mm (25.00 in.)
Other	20 in. weld flange outside diameter C	698.5	mm (27.5 in.)
Other	20 in. weld flange quantity of bolts / bolt hole diameter D	20, 31.75	mm (1.25 in.)
Other	5 in. weld flange bolt circle diameter B	215.90	mm (8.50 in.)
Other	5 in. weld flange outside diameter C	241.30	mm (9.50 in.)
Other	5 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	6 in. weld flange bolt circle diameter B	254.0	mm (10.0 in.)
Other	6 in. weld flange outside diameter C	279.4	mm (11.0 in.)
Other	6 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	8 in. weld flange bolt circle diameter B	298.45	mm (11.75 in.)
Other	8 in. weld flange outside diameter C	342.9	mm (13.5 in.)
Other	8 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	Cold start capability air temperature (w/o start aid, w/o preheating, case A)	10	°C
Other	Compressed-air tank condensate drain pressure drop	must not exceed 1	bar
Other	Coolant preheating temperature (min.)	32	°C
Other	Engine coolant pump relief bore - permissible coolant discharge	up to 10	drops per hour
Other	Engine coolant pump relief bore - permissible oil discharge	up to 5	drops/hour
Other	Permissible coolant discharge (coolant pump relief bore)	up to 10	drops/hour
Other	Permissible oil discharge (coolant pump relief bore)	up to 5	drops/hour
Other	Weld flange angle A (10, 12, 14 in. nominal pipe size)	30	deg.
Other	Weld flange angle A (16, 18, 20 in. nominal pipe size)	22.5	deg.
Other	Weld flange angle A (5, 6, 8 in. nominal pipe size)	45	deg.
Pressure	Final compression pressure	24 to 28	bar	at 120 rpm
Pressure	Fuel prefilter differential pressure (flush filter element threshold)	0.3	bar	engine running at full load or rated power
Pressure	Fuel prefilter differential pressure flush limit	≥ 0.3	bar	engine at full load / rated power
Pressure	Fuel pressure at engine supply connection, max. (starting)	1.5	bar	when engine is starting
Pressure	Fuel pressure at engine supply connection, min. (starting)	-0.1	bar	when engine is starting
Pressure	Lube oil operating pressure before engine (12V 4000 Gx3, continuous 3B)	5.0 to 6.0	bar
Pressure	Lube oil operating pressure before engine (16V 4000 Gx3, standby 3D)	4.2 to 6.5	bar
Pressure	Lube oil operating pressure before engine, from/to	5.0 to 7.0	bar	12V engines
Speed	Firing speed	80 to 120	rpm
Speed	Firing speed, from/to	80 to 120	rpm
Temperature	Coolant preheating, preheating temperature (min.)	32	°C
Temperature	Coolant temperature after engine, alarm	102	°C
Temperature	Coolant temperature after engine, shutdown	104	°C
Temperature	Coolant temperature at engine connection (outlet to cooling equipment)	100	°C
Temperature	Jacket water heater adjustable thermostat	32 to 55	°C
Torque	Battery-charging generator drive belt screw (2)	60 to 65	Nm
Torque	Battery-charging generator drive belt tension screw (1)	42	Nm
Torque	Belt drive screw (1)	42	Nm
Torque	Belt drive screw (2)	60 to 65	Nm
Torque	Centrifugal oil filter clamp	8 to 10	Nm

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	Capacity	Notes
Coolant		MTU Fluids and Lubricants Specification A001061	160.0 liters	Engine coolant capacity, engine side (without cooling equipment): 12V = 160 liters, 16V = 260 liters. Coolant antifreeze content max. 50%.
Engine oil		MTU Fluids and Lubricants Specification A001061	260.0 liters	12V engines: total engine oil capacity at initial filling 260 liters (standard oil system); 16V engines: 300 liters
Fuel	Diesel #2			Recommended Fuel for diesel gensets (e.g. DS30, DS40, DS50, DS80, DS100, DS125, DS150, DS180, DS200, DS230, DS250, DS275, DS300, DS350, DS400, DS450, DS500)
Fuel	Diesel fuel			Only fuels of the specified quality required to achieve emission limits must be used
Grease	Kluthe Hakuform 30-10 / Emulgier			Grease for injector O-rings; part X00029933
Other	Cleaner Hakutex 60			Cleaner for centrifugal oil filter rotor parts
Other	Isopropyl alcohol			Cleaning agent for connectors / contacts; part 461 81
Other	Optimoly Paste White T			Assembly paste for injector sealing ring / nozzle retaining nut; part 40477

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
003	HI T-Fuel	Preliminary warning: fuel temperature too high.	Warning	Contact Service.
004	SS T-Fuel	Main warning: fuel temperature too high; engine stop.	Shutdown	Contact Service.
005	HI T-Charge Air	Preliminary warning: charge-air temperature too high.	Warning	Reduce power. Check intercooler.
006	SS T-Charge Air	Main warning: charge-air temperature too high; engine stop.	Shutdown	Reduce power. Check intercooler.
009	AL L1 T-Coolant Intercooler	Preliminary warning: coolant temperature in intercooler too low.	Warning	Reduce power.
010	AL L2 T-Coolant Intercooler	Main warning: charge-air coolant temperature too high; engine stop.	Shutdown	Reduce power.
015	LO P-Lube Oil	Preliminary warning: lube oil pressure too low.	Warning	Check oil level, top up as necessary (Page 146).
016	SS P-Lube Oil	Main warning: lube oil pressure too low; engine will be shut down.	Shutdown	Check oil level; attempt to restart engine (Page 57).
019	HI T-Exhaust A	Preliminary warning: exhaust gas temperature (A-side) too high.	Warning	Check cabling (Page 171); Contact Service.
020	SS T-Exhaust A	Main warning: exhaust gas temperature (A-side) too high. Engine stop.	Shutdown	Check cabling; Contact Service.
021	HI T-Exhaust B	Preliminary warning: exhaust gas temperature (B-side) too high.	Warning	Check cabling; Contact Service.
022	SS T-Exhaust B	Main warning: exhaust gas temperature (B-side) too high. Engine stop.	Shutdown	Check cabling; Contact Service.
023	LO Coolant Level	Coolant level too low	Warning	Check coolant level in expansion tank (Page 153).
024	SS Coolant Level	Coolant level too low	Shutdown	Check coolant level in expansion tank (Page 153).
025	HI P-Diff. Lube Oil	Preliminary warning: oil filter differential pressure too high.	Warning	Replace oil filter (Page 150).
026	HI P-Diff. Lube Oil	Preliminary warning: Oil filter differential pressure too high	Warning	Replace oil filter
027	HI Leak Fuel Level	Preliminary warning: leak-off fuel level too high.	Warning	Check fuel system; Contact Service.
029	HI ETC 2 idle speed	Idle speed of ETC 2 too high	Warning	Contact Service
030	SS Engine Speed	Engine overspeed; reduced fuel injection	Shutdown	Acknowledge alarm; attempt to restart engine.
031	HI ETC 1 overspeed	Preliminary warning: speed of primary turbocharger too high	Warning	Contact Service
032	SS ETC 1 overspeed	Speed of primary turbocharger too high	Shutdown	1. Automatic power reduction by engine control system. 2. Check air filters.
036	HI ETC 2 overspeed	Preliminary warning: speed of secondary turbocharger too high	Warning	1. Reduce power. 2. Contact Service.
037	SS ETC 2 overspeed	Main warning: speed of secondary turbocharger too high; Fuel limitation to a fixed value	Shutdown	1. Reduce power. 2. Contact Service.
038	AL ETC Synchro Fault	Synchronization error between ETCs 1 and 2	Warning	1. Reduce power. 2. Contact Service.
039	AL ETC 2 cut-in failure	ETC2 failed to cut in	Warning	1. Reduce power. 2. Contact Service.
044	L1 Coolant Level Intercooler	Intercooler coolant level too low.	Warning	Check coolant level (Page 161).
051	HI T-Lube Oil	Preliminary warning: lube oil temperature too high.	Warning	Reduce power.
052	SS T-Lube Oil	Main warning: lube oil temperature too high; engine stop.	Shutdown	Reduce power; check engine oil level (Page 146).
057	LO P-Coolant	Preliminary warning: coolant pressure too low.	Warning	Check coolant circuit.
058	SS P-Coolant	Main warning: coolant pressure too low; engine stop or reduced injection quantity.	Shutdown	Automatic engine shutdown; check coolant level.
063	HI P-Crankcase	Preliminary warning: crankcase pressure too high.	Warning	Reduce power; replace oil separator element (Page 114).
064	SS P-Crankcase	Main warning: crankcase pressure too high; engine stop.	Shutdown	Replace oil separator element; Contact Service.
065	LO P-Fuel	Preliminary warning: fuel supply pressure too low.	Warning	Check fuel lines for leaks; clean/flush fuel prefilter; replace filter element; replace fuel filter.
066	SS P-Fuel	Main warning: fuel supply pressure too low; engine stop.	Shutdown	Check fuel lines; clean/flush/replace fuel prefilter element; replace fuel filter.
067	HI T-Coolant	Preliminary warning: coolant temperature too high.	Warning	Reduce power.
068	SS T-Coolant	Main warning: coolant temperature too high; engine stop.	Shutdown	Allow engine to cool down; check coolant cooler; restart engine; Contact Service.
081	AL Rail Leakage	Pressure gradient in rail too low during starting or too high during stopping; HP system leaky, air in system	Warning	Contact Service
082	HI P-Fuel (Common Rail)	Rail pressure > reference value; DBR fuel limitation, start of injection readjusted towards late	Warning	Contact Service
083	LO P-Fuel (Common Rail)	Rail pressure < reference value; DBR fuel limitation; suction restrictor faulty or leakage in HP fuel system	Warning	Contact Service
085	HI T-Recirculation	Preliminary warning: Recirculation temperature too high	Warning	Reduce power.
086	HI T-Recirculation	Main warning: Recirculation temperature too high	Warning	Reduce power.
089	AL Stalling Engine	Engine speed too low	Warning	Check for additional messages.
090	SS No Idling Speed	Idling speed was not attained	Shutdown	Contact Service.
091	SS No Runup Speed	Runup speed was not attained	Shutdown	Contact Service.
092	SS No Starter Speed	Starter speed was not attained; termination of starting sequence; starter rotates too slowly or not at all.	Shutdown	Contact Service.
093	SS T-Preheat	Main warning: preheating temperature too low; coolant temperature too low for engine start; engine start interlock active.	Shutdown	Check preheater.
094	LO T-Preheat	Preheating temperature too low; coolant temperature too low for engine start	Warning	Check preheater.
095	AL Prelubrication Fault	Oil priming failure	Warning	Check oil priming system.
102	AL Consumption Meter Faulty	Consumption meter faulty	Warning	Contact Service
104	AL Eng Hours Counter Defect	Hourmeter faulty	Warning	Contact Service
118	LO ECU Supply Voltage	Preliminary warning: supply voltage too low.	Warning	Check ECU supply voltage; Contact Service.
119	LOLO ECU Supply Voltage	Main warning: supply voltage too low.	Shutdown	Check ECU supply voltage; Contact Service.
120	HI ECU Supply Voltage	Preliminary warning: supply voltage too high.	Warning	Check ECU supply voltage; Contact Service.
121	HIHI ECU Supply Voltage	Main warning: supply voltage too high.	Shutdown	Check ECU supply voltage; Contact Service.
122	HI T-ECU	Preliminary warning: temperature in ECU too high.	Warning	Reduce power; improve engine room ventilation.
134	15V POS ECU DEFECT	Internal voltage (-15 VDC) faulty; automatic engine shutdown	Shutdown	Replace ECU.
136	15V NEG ECU DEFECT	Internal voltage (-15 VDC) missing; automatic engine shutdown	Shutdown	Contact Service.
139	L1 TE BUFFER TEST	Supply voltage of temperature sensors faulty	Warning	1. Check sensors. 2. Replace ECU. 3. Contact Service.
140	TE BUF. ECU DEFECT	Supply voltage of temperature sensors faulty	Shutdown	1. Check sensors. 2. Replace ECU. 3. Contact Service.
142	BANK1 ECU DEFECT	Power output stage for control of the solenoid valves on bank 1 is faulty; Engine does not start	Shutdown	Replace ECU.
144	BANK2 ECU DEFECT	Power output stage for control of the solenoid valves on bank 2 is faulty; Engine does not start	Shutdown	Replace ECU.
145	15V_GOOD ECU DEFECT	Power supply faulty; automatic engine shutdown	Shutdown	Replace ECU.
146	L1 AD-TEST1 SUPPLY	Supply voltage A/D converter too low	Warning	Replace ECU.
147	AD-TEST1 ECU DEFECT	Electronic fault; automatic engine shutdown	Shutdown	Replace ECU.
148	L1 AD-TEST2 SUPPLY	Supply voltage A/D converter too low	Warning	Replace ECU.
149	AD-TEST2 ECU DEFECT	Internal electronic fault; automatic engine shutdown	Shutdown	Replace ECU.
150	L1 AD-TEST3 SUPPLY	Internal electronic fault; automatic engine shutdown	Warning	Replace ECU.
151	AD-TEST3 ECU DEFECT	Internal electronic fault; automatic engine shutdown	Shutdown	Replace ECU.
173	MODULE WRITE LIMIT REACHED	EEPROM write limit reached.	Info	Contact Service.
176	AL LifeData Not Avail	No (appropriate) LifeData backup system available, ECU reset after expiration of time-out period	Warning	Contact Service.
177	AL LifeData restore incomplete	CRC faulty during a data upload to ADEC	Warning	Contact Service.
180	AL CAN1 Node Lost	Connection to one node on CAN bus 1 failed.	Warning	Contact Service.
181	AL CAN2 Node Lost	Connection to one node on CAN bus 2 failed.	Warning	Contact Service.
182	AL CAN Wrong Parameters	Incorrect parameter values entered in data record	Warning	Contact Service.
183	AL CAN No PU-Data	CAN mode selected requiring communication with PU data module; required PU data module not available or not valid	Warning	Contact Service.
184	AL CAN PU-Data Flash Error	Programming error when copying a received PU data module into the Flash module	Warning	Contact Service.
186	CAN1 BUS OFF	Severe fault on Default CAN bus; automatic change-over to Redundant CAN bus.	Warning	Contact Service.
187	AL CAN1 Error Passive	CAN controller 1 has signalled a warning	Warning	1. Inspect CAN bus for short circuit and rectify. 2. Check shielding. 3. Contact Service.
188	AL CAN2 Bus Off	CAN controller 2 is in Bus-Off status; automatic changeover to CAN 1; short circuit, massive interference or Baud rate incompatibility	Warning	1. Inspect CAN bus for short circuit and rectify. 2. Check shielding. 3. Contact Service.
189	AL CAN2 Error Passive	CAN controller 2 has signalled a warning	Warning	1. Inspect CAN bus for short circuit and rectify. 2. Check shielding. 3. Contact Service.

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

Procedures

Valve clearance - Check and adjustment adjustment

Tools: Feeler gauge Y20010128, Torque wrench 60-320 Nm F30047446, Ring socket, 24 mm F30039526

Remove cylinder head cover
Install barring tool
Rotate crankshaft until marking OT-A1 and pointer are aligned
Check TDC position of piston in cylinder A1
Check valve clearance with cold engine: inlet 0.2 mm, exhaust 0.5 mm
Check all valve clearances at two crankshaft positions
Use feeler gauge to determine distance between valve bridge and rocker arm
If deviation exceeds 0.1 mm, adjust valve clearance
Release locknut and set adjusting screw with Allen key
Tighten locknut to 90 +9 Nm holding adjusting screw firm

Cylinder liner - Endoscopic examination diagnostic

Tools: Rigid endoscope Y20097353

Remove cylinder-head cover
Remove injector
Turn crankshaft until crankpin of cylinder to be tested has reached BDC
Insert endoscope into cylinder liner through injector seat
Compile endoscopy report using the table
Depending on findings: no action, further examination, or contact Service (liner replacement)
Install injector
Install cylinder-head cover

Air filter - Removal and installation maintenance

Loosen clamp.
Remove air filter and clamp from flange of intake housing.
Verify that there are no objects in the flange of the intake housing and clean it.
Place new air filter with clamp onto intake housing.
Tighten clamp.
Reset signal ring of service indicator.

Air filter removal and installation maintenance

Loosen clamp
Remove air filter and clamp from flange of intake housing
Verify no objects in flange and clean it
Place new air filter with clamp onto intake housing
Tighten clamp
Reset signal ring of service indicator

Battery-charging generator drive - Drive belt replacement maintenance

⚠ Spring/circlip/tensioning roller preload. Risk of injury!

Remove guard cover
Slacken screws (1) and (2) by half a turn
Place socket adapter or box wrench on screw (3) and press belt tensioner as far as it will go
Tighten screw (2), remove used drive belt and fit new drive belt
Slacken screw (2) by half a turn so tensioner tensions the belt
Tighten screw (1) to 42 Nm and screw (2) to 60-65 Nm
Install guard cover
Readjust belt tension after 30 minutes and after 8 hours engine runtime

Centrifugal oil filter - Cleaning and filter-sleeve replacement maintenance

⚠ Hot oil. Oil can contain combustion residues which are harmful to health.

⚠ Compressed air. Risk of injury!

Tools: Torque wrench 6-50 Nm F30027336

Remove clamp, release Tommy nut and take off cover
Lift rotor, allow oil to drain and remove from housing
Release rotor cover nut and take off rotor cover
Remove filter sleeve and measure thickness of oil residues
If maximum layer thickness exceeds 45 mm, shorten maintenance interval
Disassemble rotor tube, conical disk and rotor base, wash with cleaner and blow out with compressed air
Check sealing ring, fit new one if necessary
Insert new filter sleeve with smooth paper surface facing the wall
Mount rotor cover with sealing ring and tighten rotor cover nut to 35-45 Nm
Fit cover, tighten Tommy nut by hand, fit clamp and tighten 8-10 Nm, tighten cover nut 5-7 Nm

Crankcase breather - Oil separator replacement, diaphragm check and replacement maintenance

⚠ Hot oil. Oil can contain combustion residues which are harmful to health.

Tools: Torque wrench 6-50 Nm F30027336

Remove cover with O-ring
Remove filter element from housing
Insert new filter element in housing
Fit cover with new O-ring
Tighten screws of cover to 10 Nm -2 Nm
Checking diaphragm: remove cover, take off spring, seal and diaphragm
Check diaphragm for damage, fit new if damaged
Mount diaphragm on housing
Install new seal and spring with cover and tighten screws to 10 Nm -2 Nm

ECU - Checking plug-in connections maintenance

Verify that all plug-in connections are securely seated
Secure loose connectors and latch

Engine - Barring manually maintenance

⚠ Unguarded rotating and moving engine components. Risk of serious injury - danger to life!

Tools: Barring tool F6555766, Ratchet F30006212

Remove guard plate
Engage barring tool with ring gear and mount on flywheel housing
Set ratchet onto barring tool
Rotate crankshaft in engine direction of rotation
No abnormal resistance apart from normal compression resistance
For removal follow reverse sequence

Engine - Barring with starting system maintenance

⚠ Unguarded rotating and moving engine components. Risk of serious injury - danger to life!

Release latch of connector X4
Disconnect connector from ECU
Bar engine in unloaded condition: press START button
Let crankshaft rotate until oil pressure is indicated
If starting period expires, re-start after approx. 20 seconds
Connect connector X4 to ECU and latch in position

Engine coolant - Filling maintenance

⚠ Coolant is hot and under pressure. Risk of injury and scalding!

⚠ Cold coolant in hot engine can cause thermal stress.

Turn breather valve of filler neck counterclockwise to first stop and allow pressure to escape
Continue to turn breather valve counterclockwise and remove
Filling with pump: connect pump with hose to drain valve, open it and pump coolant in at 0.5 bar minimum
Fill expansion tank until overflow edge is reached
Close drain valve and fit breather valve
Start engine, run unloaded 10 seconds, stop engine
Check coolant level and top up if required
Alternatively fill coolant through filler neck until level at top edge of filler neck remains constant

Engine oil - Change maintenance

⚠ Hot oil. Oil can contain combustion residues which are harmful to health.

Tools: Torque wrench F30027337, Ratchet adapter F30027341

Provide container to collect oil
Remove drain plug(s) and drain oil
Install drain plug(s) with new sealing ring
Extract all oil from oil pan using hand pump (if used)
Remove drain plug and drain approx. 7 liters from oil heat exchanger and oil filter
Remove drain plugs (2) and (3): approx. 12 liters and approx. 5 liters
Replace engine oil filter
Tighten drain plugs (2) and (3) to 100 Nm +10 Nm
Fill with new oil at filler neck up to max. mark
Bar engine with starting system after oil change and filter replacement

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	Notes
208V	3	12 LEAD WYE	Example from MTU 4R0063 GS30
240V	1	12 LEAD	Example from MTU 4R0063 GS30 SYSTEM RATINGS connection row
240V	1	4 LEAD	Example from MTU 4R0063 GS30
240V	3	12 LEAD DELTA	Example from MTU 4R0063 GS30
380/400/415			Standard scope voltage, 50 Hz (S1600/S2000/S4000)
380/440/480			Standard scope voltage, 60 Hz (S1600/S2000/S4000)
380V	3	12 LEAD WYE	Example from MTU 4R0063 GS30
400/230			Standard scope voltage, 1600 series, 50 Hz
440/480			Alternator voltages, 60 Hz
480/277			Standard scope voltage, 1600 series, 60 Hz
480V	3	12 LEAD WYE	Example from MTU 4R0063 GS30
600V	3	4 LEAD WYE DOUBLE DELTA	Example from MTU 4R0063 GS30

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 MTU 12V4000 family

Part #	Description	Category
WM00076	Air filter element	Air filter
WM00086	Easy-change fuel filter	Fuel filter
WM00067	Oil filter element	Oil filter
3082751	Reman engine	Service part / kit

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

0035352531 Amazon eBay FridayParts $365.68 0035352731 Amazon eBay FridayParts $250.20

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

Fuel filter: Donaldson P550849 Wix 33763 Baldwin PF7928

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

Also used in

Hitachi EH3000 — Haul Truck
Hitachi EH3500 — Haul Truck

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 MTU 12V 4000 G23?

The MTU 12V 4000 G23 engine has an oil capacity of 260.0 liters.

What is the displacement of the MTU 12V 4000 G23?

The MTU 12V 4000 G23 has a displacement of 57.2 liters with 16 cylinders.

Which generators use the MTU 12V 4000 G23 engine?

The MTU 12V 4000 G23 powers 7 generator set(s), including Kohler 1500REOZDD, MTU 12 V 4000 G23, MTU 12V4000 DS1750, MTU DP 1670 D5S FW, MTU DS 1880 D5S FW.

What fuel filter does the MTU 12V 4000 G23 use?

The MTU 12V 4000 G23 uses fuel filter part numbers Donaldson P550849, Wix 33763, Baldwin PF7928.

What is a common problem with the MTU 12V 4000 G23 engine?

A commonly reported issue on generators using the MTU 12V 4000 G23 is: LO P-Fuel (Common Rail pressure < reference value; DBR fuel limitation, start of injection readjusted towards late; suction restrictor of HP fuel block jamming or HP fuel control block wiring faulty.. Fix: Contact Service..