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MTU 20 V 4000 G23 Engine

Name: MTU 20 V 4000 G23 Engine
Brand: MTU

The MTU 20 V 4000 G23 is a 95.4 L 20-cylinder exhaust turbocharging (etc) with charge-air cooling (cac) engine rated at 1500 rpm, producing up to 2200 kW. It powers generator sets from MTU, including the 20V4000 DS2750, DP 2610 D5S, DP 2610 D5S FW and DS 2870 D5S. It holds 390 L (103.0 gal) of oil and 205 L (54.2 gal) of coolant.

Also known as: MTU 20 V 4000 G23, 20V 4000 G23

Part of the MTU 20 V 4000 engine family — 3 variants share parts & fitment.

95.4 L

Displacement

Cylinders

1500 rpm

Rated speed

2200 kW

Gross power

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

Engine specifications

Oil capacity	390.0 L
Coolant capacity	205.0 L
Displacement	95.4 L
Cylinders	20
Aspiration	Exhaust turbocharging (ETC) with charge-air cooling (CAC)
Rated speed	1500 rpm
Gross power	2200 kW

Generator sets powered by this engine

MTU 20V4000 DS2750MTU DP 2610 D5SMTU DP 2610 D5S FWMTU DS 2870 D5S MTU DS 2870 D5S FW

How to read your MTU engine serial & model number →

Troubleshooting

Fault codes

Code	Meaning	Remedy
99	Lube-oil temperature before engine, shutdown
101	Lube-oil temperature before engine, shutdown
401	Lube oil pressure before engine, shutdown
SEO03	Nd11 231	Contact Service.
003	HI T-Fuel	Contact Service.
004	SS T-Fuel	Contact Service.
005	HI T-Charge Air	1. Reduce power, 2. Check intercooler.
006	SS T-Charge Air	1. Reduce power, 2. Check intercooler.
009	HI T-Coolant Intercooler	Reduce power.
010	SS T-Coolant Intercooler	Reduce power.
015	LO P-Lube Oil
016	SS P-Lube Oil	1. Check oil level, top up as necessary (> Page 169). 2. Attempt to restart engine (-» Page 55).
019	HI T-Exhaust A	1. Check cabling (— Page 194). 2. Contact Service.
020	SS T-Exhaust A	1. Check cabling (— Page 194). 2. Contact Service.
021	HI T-Exhaust B	1. Check cabling (— Page 194). 2. Contact Service.
022	SS T-Exhaust B	1. Check cabling (> Page 194). 2. Contact Service.
023	LO Coolant Level	Check coolant level in expansion tank (— Page 176).
025	HI P-Diff Lube Oil	Replace oil filter (— Page 173).
026	HI P-Diff Lube Oil	Replace oil filter (— Page 173).
027	HI Leak Fuel Level	1. Check fuel system. 2. Contact Service.
029	HI ETC 2 idle speed	Contact Service.
030	SS Engine Speed	1. Acknowledge alarm. 2. Attempt to restart engine.
031	HI ETC 1 overspeed	Contact Service.
032	SS ETC 1 overspeed	1. Automatic power reduction by engine control system. 2. Check air filters (— Page 164).
033	HI P-Diff-Fuel	Replace fuel filter (— Page 153).
034	SS P-Diff-Fuel	Replace fuel filter (— Page 153).
036	HI ETC 2 Overspeed	1. Reduce power. 2. Contact Service.
037	SS ETC 2 Overspeed	1. Reduce power. 2. Contact Service.
038	AL ETC Speed Deviation	1. Reduce power. 2. Contact Service.
039	AL ETC 2 Cutin Failure	1. Reduce power. 2. Contact Service.
044	LO Coolant Level Intercooler	Check coolant level (— Page 184).
051	HI T-Lube Oil	Reduce power.
052	SS T-Lube Oil	1. Reduce power. 2. Check engine oil level (— Page 169).
057	LO P-Coolant	Check coolant circuit.
058	SS P-Coolant	1. Automatic engine shutdown. 2. Check coolant level (— Page 176).
059	SS T-Coolant L3	1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Contact Service.
060	SS T-Coolant L4	1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Contact Service.
063	HI P-Crankcase	1. Reduce power. 2. Replace oil separator element (— Page 138).
064	SS P-Crankcase	1. Replace oil separator element (— Page 138). 2. Contact Service.
065	LO P-Fuel	Clean fuei prefilter (— Page 154). Flush fuel prefiiter (+ Page 158). Replace filter element of fuel prefilter (> Page 160). Replace fuel filter (=> Page 153).
066	SS P-Fuel	Clean fuei prefilter (— Page 154). Flush fuel prefiiter (+ Page 158). Replace filter element of fuel prefilter (> Page 160). Replace fuel filter (=> Page 153).
067	Hi T-Coolant	Reduce power.
068	SS T-Coolant	1. Allow engine to cool down; 2. Check coolant cooler, clean if necessary; 3. Restart engine (— Page 59). 4. Contact Service.
081	AL Rail Leakage	Contact Service.
082	HI P-Fuel (Common Rail)	Contact Service.
083	LO P-Fuel (Common Rail)	Contact Service.
085	HI T-Recirculation	Reduce power.
086	HI T-Recirculation	Reduce power.
089	SS Engine Speed too Low	Check for additional messages.
090	SS Starter Speed Not Reached	Contact Service.
091	SS Release Speed Not Reached	Contact Service.
092	SS Starter Speed Not Reached	Contact Service.
093	SS T-Preheat	Check preheater.
094	LO T-Preheat	Check preheater.
095	AL Prelubrication Fault	Check oil priming system.
102	AL Consumption Meter Faulty	Contact Service.
104	AL Eng Hours Counter Defect	Contact Service.

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

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter	Dry		—
Fuel filter			—
Oil filter			—
Battery			—
Belt			—
Coolant		205.0 l	—
Oil		390.0 l	—
Spark plug			—

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

Repair guides

Drive Belt Condition Check

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

Service intervals

Item	Action	Hours	Months	Notes
Centrifugal oil filter	Clean	500 hr	24 mo	Check oil residue layer thickness, clean, replace filter sleeve
Fuel filter	Replace	1000 hr	24 mo	Task W1001; limit 2 years
Belt drive	Check	1600 hr	24 mo	Check drive belt condition and tension, replace/adjust if necessary; Task W1003
Valve gear	Check	1500 hr		Check valve clearance; Task W1002
Cylinder chambers	Inspect	5000 hr	48 mo	Endoscope cylinder chambers
Fuel injectors	Replace	5000 hr
Exhaust turbocharger	Other	6000 hr		3D application group: overhaul exhaust turbochargers
Component maintenance	Other	10000 hr		Drain coolant and flush coolant circuits; clean air line; clean intercooler and check leak-tightness; replace HP fuel sensor; check engine coolant thermostat and replace thermostat element; check charge-air coolant thermostat and replace thermostat element; check centrifugal oil filter for wear; overhaul starter; overhaul charge-air coolant pump; replace sealing materials on all dismantled components; overhaul engine coolant pump; check vibration dampers; overhaul engine coolant preheater
Crankcase breather	Replace	10000 hr		Replace filter or filter element
Cylinder head	Other	10000 hr		Overhaul cylinder heads
Fuel delivery pump	Replace	10000 hr
Air filter	Replace	3000 hr	36 mo	Task W1005; limit 3 years
Engine oil filter	Replace		24 mo	Replace when changing engine oil or when 2-year interval reached; Task W1008
Engine operation	Test		1 mo	Perform test run, min. duration until steady-state temperature reached, not below 1/3 load (monthly)
Extended component maintenance	Other	10000 hr	216 mo	Limit 18 years; complete engine disassembly; Task W3000

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 max oil residue layer thickness	45	mm
Clearance	Valve clearance adjustment deviation limit	0.1	mm	cold engine
Clearance	Valve clearance deviation requiring adjustment	0.1	mm	exceeds reference value
Other	Coolant antifreeze content, max.	50	%
Other	Coolant pump permissible coolant discharge at relief bore	up to 10	drops/hour
Other	Coolant pump permissible oil discharge at relief bore	up to 5	drops/hour
Other	Engine weight, dry	9640	kg	basic engine configuration
Other	Main engine height (C)	2490	mm	approx.
Other	Main engine length (A)	3520	mm	approx.
Other	Main engine width (B)	1620	mm	approx.
Other	Permissible coolant discharge, engine coolant pump relief bore	10	drops/hour
Other	Permissible oil discharge, engine coolant pump relief bore	5	drops/hour
Other	Site altitude above sea level reference	100	m
Pressure	Barometric pressure reference	1000	mbar
Pressure	Charge air pressure before cylinder, BL	2.5 to 3.6	bar abs	varies by model
Pressure	Final compression pressure	24 to 28	bar	at 120 rpm
Pressure	Final compression pressure at 120 rpm	24 to 28	bar	at 120 rpm
Pressure	Fuel prefilter differential pressure (flush threshold)	0.3	bar	engine at full load / rated power
Pressure	Fuel prefilter differential pressure flush limit	0.3	bar	flush filter element if differential pressure >=
Pressure	Fuel pressure at engine inlet connection, max during starting	1.5	bar
Pressure	Fuel pressure at engine inlet connection, min during starting	-0.1	bar
Pressure	Lube-oil operating pressure before engine, from	4.5 to 5.0	bar	varies by model
Pressure	Lube-oil operating pressure before engine, to	7.3 to 7.8	bar	varies by model
Speed	Firing speed	80 to 120	rpm
Speed	Firing speed, from	80	rpm
Speed	Firing speed, to	120	rpm
Temperature	Cold start capability air temperature (w/o start aid, w/o preheating)	10	°C	case A
Temperature	Cold start capability air temperature (without start aid/preheating)	10	°C
Temperature	Coolant preheating temperature (min.)	32	°C
Temperature	Coolant temperature (design value)	100	°C	at engine outlet to cooling equipment
Temperature	Coolant temperature after engine (alarm)	102	°C
Temperature	Coolant temperature after engine (shutdown)	104	°C
Temperature	Coolant temperature after engine, alarm	102	°C
Temperature	Coolant temperature after engine, shutdown	104	°C
Temperature	Coolant temperature before intercooler (LT circuit)	45	°C	at engine inlet from cooling equipment
Temperature	Intake air temperature reference	25	°C
Temperature	Jacket water heater adjustable thermostat	32 to 55	°C
Temperature	Lube-oil temperature before engine, alarm	99	°C
Temperature	Lube-oil temperature before engine, shutdown	101	°C
Torque	Battery-charging generator drive belt screw (1)	42	Nm
Torque	Battery-charging generator drive belt screw (2)	60 to 65	Nm
Torque	Belt tensioner screw (1)	42	Nm
Torque	Belt tensioner screw (2)	60 to 65	Nm
Torque	Centrifugal oil filter clamp	8 to 10	Nm
Torque	Centrifugal oil filter cover nut	5 to 7	Nm
Torque	Centrifugal oil filter rotor cover nut	35 to 45	Nm
Torque	Crankcase breather cover screw	10	Nm	tolerance -2 Nm, lubricant engine oil
Torque	Crankcase breather cover screws	10 -2	Nm
Torque	Cylinder head cover screws	42	Nm
Torque	HP fuel line, injector side	20 +5	Nm
Torque	HP fuel line, rail side	30 +5	Nm
Torque	Injector adapter preload	5 to 10	Nm	engine oil
Torque	Injector adapter tightening	100	Nm	tolerance +10 Nm
Torque	Injector hold-down clamp screw and adapter	100 +10	Nm
Torque	Injector hold-down screw M12 preload	5 to 10	Nm	engine oil
Torque	Injector hold-down screw M12 tightening	100	Nm	tolerance +10 Nm
Torque	Injector pretightening (hold-down screw and adapter)	5 to 10	Nm
Torque	Jacketed HP fuel line union nut / thrust screw	40	Nm	tolerance +5 Nm
Torque	Nuts (6) on screws (5) transport locking device	30	Nm	tolerance +3 Nm, lubricant engine oil
Torque	Oil drain plugs (2),(3)	100	Nm	tolerance +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 Specifications A001061/..	205.0 liters	Engine coolant capacity, engine side (without cooling equipment)
Engine oil		MTU Fluids and Lubricants Specifications A001061/..	390.0 liters	Total engine oil capacity at initial filling (standard oil system); oil pan capacity at dipstick mark min 245 L, max 340 L
Fuel	Diesel fuel	MTU Fluids and Lubricants Specifications A001061/..		Fuel pressure at engine inlet connection min -0.1 bar, max 1.5 bar during engine starting

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	HI T-Coolant Intercooler	Preliminary warning: Coolant pressure in intercooler too low.	Warning	Reduce power.
010	SS 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.
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.
019	HI T-Exhaust A	Preliminary warning: Exhaust temperature (A-side) too high.	Warning	Check cabling; contact Service.
020	SS T-Exhaust A	Main warning: Exhaust temperature (A-side) too high; Engine stop.	Shutdown	Check cabling; contact Service.
021	HI T-Exhaust B	Preliminary warning: Exhaust temperature (B-side) too high.	Warning	Check cabling; contact Service.
022	SS T-Exhaust B	Main warning: Exhaust temperature (B-side) too high; Engine stop.	Shutdown	Check cabling; contact Service.
023	LO Coolant Level	Coolant level too low (limit value 1).	Warning	Check coolant level in expansion tank.
024	SS Coolant Level	Coolant level too low (limit value 2).	Shutdown	Check coolant level in expansion tank.
025	HI P-Diff. Lube Oil	Preliminary warning: Oil filter differential pressure too high.	Warning	Replace oil filter.
026	HI P-Diff. Lube Oil Limit 2	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	Reduced fuel injection	Shutdown	Acknowledge alarm; attempt to restart engine.
031	HI ETC 1 overspeed	Speed of primary turbocharger too high	Warning	Contact Service.
032	SS ETC 1 overspeed	Speed of primary turbocharger too high.	Shutdown	Automatic power reduction; check air filters.
034	SS P-Diff-Fuel	Fuel filter differential pressure too high	Shutdown	Replace fuel filter.
036	HI ETC 2 overspeed	Preliminary warning: Speed of secondary turbocharger too high.	Warning	Reduce power; contact Service.
037	SS ETC 2 overspeed	Speed of secondary turbocharger too high; fuel limitation to a fixed value.	Shutdown	Reduce power; contact Service.
038	AL ETC Synchro Fault	Synchronization error between ETCs 1 and 2.	Warning	Reduce power; contact Service.
039	AL ETC 2 cut-in failure	ETC2 failed to cut in.	Warning	Reduce power; contact Service.
044	L1 Coolant Level Intercooler	Intercooler coolant level too low (limit value 1).	Warning	Check coolant level.
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.
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 fuel injection.	Shutdown	Automatic engine shutdown; check coolant level.
063	HI P-Crankcase	Preliminary warning: Crankcase pressure too high.	Warning	Reduce power; replace oil separator element.
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 fuel filter.
066	SS P-Fuel	Main warning: Fuel supply pressure too low; Engine stop.	Shutdown	Check fuel lines; clean fuel prefilter; replace prefilter element and 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; 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 > set-point value; DBR reduction, start of injection moved to late; suction restrictor jamming or wiring of suction restrictor faulty	Warning	Contact Service.
083	LO P-Fuel (Common Rail)	Rail pressure > set-point value; DBR reduction, suction restrictor faulty or leak 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.	Shutdown	Reduce power.
089	SS Engine Speed too Low	Engine speed too low.	Warning	Check for additional messages.
090	SS Starter Speed Not Reached	Idling speed was not attained.	Shutdown	Contact Service.
091	SS Release Speed Not Reached	Runup speed was not attained.	Shutdown	Contact Service.
092	SS Starter Speed Not Reached	Starter speed was not attained; termination of starting sequence.	Shutdown	Contact Service.
093	SS T-Preheat	Preheating temperature too low; 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	Supply voltage too low	Warning	Check ECU supply voltage; contact Service.
119	LOLO ECU Supply Voltage	Supply voltage too low	Shutdown	Check ECU supply voltage; contact Service.
120	HI ECU Supply Voltage	Supply voltage too high	Warning	Check ECU supply voltage; contact Service.
121	HIHI ECU Supply Voltage	Supply voltage too high	Shutdown	Check ECU supply voltage; contact Service.
122	HI T-ECU	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.
142	BANK1 ECU DEFECT	Power output stage for control of solenoid valves on bank 1 faulty; engine does not start.	Shutdown	Replace ECU.
144	BANK2 ECU DEFECT	Power output stage for control of solenoid valves on bank 2 faulty; engine does not start.	Shutdown	Replace ECU.
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.
186	AL CAN1 Bus Off	CAN controller 1 is in Bus-Off status.	Warning	Inspect CAN bus for short circuit; check shielding; contact Service.
188	AL CAN2 Bus Off	CAN controller 2 is in Bus-Off status; automatic changeover to CAN 1.	Warning	Inspect CAN bus for short circuit; check shielding; contact Service.
201	SD T-Coolant	Coolant temperature sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (B6), replace as necessary. Error cleared after restarting the engine.
202	SD T-Fuel	Fuel temperature sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (B33), replace as necessary. Error cleared after restarting the engine.
203	SD T-Charge Air	Charge-air temperature sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (B9), replace as necessary. Error cleared after restarting the engine.
204	SD Level Lube Oil	Lube-oil level sensor faulty; short circuit or wire break	Warning	Check sensor and cabling, replace as necessary.
205	SD T-Exhaust A	Exhaust temperature sensor on A-side faulty; short circuit or wire break.	Warning	Check sensor and cabling (B4.21), replace as necessary.
206	SD T-Exhaust B	Exhaust temperature sensor on B-side faulty; short circuit or wire break.	Warning	Check sensor and cabling (B4.22), replace as necessary.
207	SD T-Exhaust B	Exhaust temperature sensor on B-side faulty; short circuit or wire break	Warning	Check sensor and cabling (B4.22), replace as necessary. Error cleared after restarting the engine.
208	SD P-Charge Air	Charge-air pressure sensor faulty; short circuit or wire break	Warning	Check sensor and cabling (B10), replace as necessary. Error cleared after restarting the engine.
211	SD P-Lube Oil	Lube-oil pressure sensor faulty; short circuit or wire break	Warning	Check sensor and cabling (B5), replace as necessary. Error cleared after restarting the engine.
212	SD P-Coolant	Coolant pressure sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (B16), replace as necessary. Error cleared after restarting the engine.
213	SD P-Coolant Intercooler	Coolant pressure sensor of intercooler faulty; short circuit or wire break	Warning	Check sensor and cabling (B43), replace as necessary. Error cleared after restarting the engine.
214	SD P-CrankCase	Crankcase pressure sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (B50), replace as necessary. Error cleared after restarting the engine.
215	SD P-HD	Rail pressure sensor faulty; HP regulator in emergency mode.	Warning	Check sensor and cabling (B48), replace as necessary. Error cleared after restarting the engine.
216	SD T-Lube Oil	Lube-oil temperature sensor faulty; short circuit or wire break	Warning	Check sensor and cabling (B7), replace as necessary. Error cleared after restarting the engine.
219	SD T-Intake Air	Intake air temperature sensor faulty; short circuit or wire break	Warning	Check sensor and cabling (B3), replace as necessary. Error cleared after restarting the engine.
220	SD Coolant Level	Coolant level sensor faulty; short circuit or wire break.	Warning	Check sensor and cabling (F33), replace as necessary. Error cleared after restarting the engine.

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

⚠ Engine coolant temperature max. 40 °C.

⚠ Valves must be closed.

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 clearances at firing and overlap TDC per diagram.
If deviation exceeds 0.1 mm, adjust.
Release locknut, set adjusting screw, tighten locknut to 90 +9 Nm.

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 valve clearance with cold engine.
Inlet valves (long rocker arm) = 0.2 mm.
Exhaust valves (short rocker arm) = 0.5 mm.
Adjust if deviation exceeds 0.1 mm.
Release locknut, set adjusting screw, tighten locknut to 90 +9 Nm.

Air filter removal and installation maintenance

Loosen clamp.
Remove air filter and clamp from flange of intake housing.
Verify flange is clean and free of objects.
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 of intake housing 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; only use specified tool and equipment.

Remove guard cover.
Slacken screws (1) and (2) by half a turn.
Press belt tensioner fully using socket adapter on screw (3).
Tighten screw (2).
Remove used drive belt.
Fit new drive belt.
Slacken screw (2) by half a turn.
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 runtime.

Battery-charging generator drive — Drive belt replacement maintenance

⚠ Spring/circlip/tensioning roller preload. Risk of injury. Only use specified tool and equipment.

Tools: Socket adapter or box wrench

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 fully.
Tighten screw (2).
Remove used drive belt.
Fit new drive belt.
Slacken screw (2) by half a turn.
Tighten screw (1) to 42 Nm and screw (2) to 60 Nm up to 65 Nm.
Install guard cover.
Readjust belt tension after 30 minutes and again after 8 hours engine runtime.

Centrifugal oil filter – Cleaning and filter-sleeve replacement maintenance

⚠ Hot oil: wear protective clothing, gloves, goggles.

⚠ Compressed air: do not direct jet at persons; wear goggles and ear protectors.

Tools: Torque wrench 6-50 Nm F30027336

Remove clamp.
Release Tommy nut and take off cover.
Lift rotor, allow oil to drain, remove from housing.
Release rotor cover nut, take off rotor cover.
Remove filter sleeve and measure oil residue thickness; if >45 mm shorten interval.
Disassemble rotor tube, conical disk and rotor base; wash with cleaner.
Blow out with compressed air.
Check/renew sealing rings.
Assemble rotor tube, conical disk and rotor base with sealing ring.
Insert new filter sleeve with smooth paper surface facing wall.
Mount rotor cover with sealing ring and tighten rotor cover nut 35-45 Nm.
Place rotor in housing and check ease of movement.
Fit sealing ring, cover, Tommy nut by hand; fit clamp 8-10 Nm and cover nut 5-7 Nm.

Centrifugal oil filter — Cleaning and filter-sleeve replacement maintenance

⚠ Hot oil. Wear protective clothing, gloves, goggles. Avoid contact with skin. Do not inhale oil vapor.

⚠ Compressed air: do not direct jet at persons; wear protective goggles/safety mask and ear protectors.

Tools: Torque wrench 6-50 Nm F30027336

Remove clamp.
Release Tommy nut and take off cover.
Carefully lift rotor, allow oil to drain and remove from housing.
Release rotor cover nut.
Take off rotor cover.
Remove filter sleeve.
Measure thickness of oil residues on filter sleeve.
Assemble with new filter sleeve and sealing rings; tighten rotor cover nut 35-45 Nm, clamp 8-10 Nm, cover nut 5-7 Nm.

Charge-air coolant – Draining maintenance

⚠ Coolant is hot and under pressure.

Provide suitable container.
Turn breather valve counterclockwise to first stop and remove.
Draw off segregated corrosion inhibitor oil in expansion tank.
Open drain valves/plugs and drain coolant at LT coolant pump and LT thermostat housing.
Drain residual coolant at intercooler.
Close all drain valves and install drain plugs with new sealing rings.
Place breather valve on filler neck and close.

Charge-air coolant – Filling maintenance

⚠ Coolant is hot and under pressure.

⚠ Fill/top up coolant only into cold engine.

Turn breather valve counterclockwise to first stop and remove.
Connect pump to drain valve; open and pump coolant at 0.5 bar minimum.
Fill expansion tank until overflow edge reached.
Close drain valve and fit breather valve.
Start engine, run unloaded 10 seconds, stop engine.
Check coolant level and top up if required; repeat as necessary.

Crankcase breather – Oil separator replacement, diaphragm check maintenance

⚠ Hot oil: wear protective clothing, gloves, goggles; avoid skin contact and inhalation.

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 cover screws to 10 Nm -2 Nm.
For diaphragm: remove cover, take off spring, seal and diaphragm.
Check diaphragm for damage, fit new if damaged.
Mount diaphragm, install new seal and spring with cover.
Tighten cover screws to 10 Nm -2 Nm.

Cylinder head cover – Remove and install maintenance

Tools: Torque wrench 10-60 Nm F30510423

Clean very dirty covers prior to removal.
Remove screws.
Remove cover with gasket.
Clean mating faces.
Check gasket, replace if necessary.
Place gasket and cover on cylinder head.
Install screws and tighten to 42 Nm.
Use new gasket when installing.

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
380/400/415				Standard scope voltage, 50 Hz (S1600/S2000/S4000)
380/440/480				Standard scope voltage, 60 Hz (S1600/S2000/S4000)
400/230				Standard scope voltage, 1600 series, 50 Hz
440/480				Alternator voltages, 60 Hz
480/277				Standard scope voltage, 1600 series, 60 Hz

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 20 V 4000 family

Part #	Description	Category
5240150417	ACHSE	axle
700223016000	HOHLSCHRAUBE	banjo_screw
700222016000	RINGSTUECK	banjo_union
5241800080	KURBELWELLENLAGER KUPPLUNGSGEGENSEITE	bearing
X00037029	RIEMENSCHEIBE	belt_pulley
X00039375	RIEMENSCHEIBE	belt_pulley
0029923501	BUCHSE	bushing
X00040005	ANSCHLUSSTEILE F.KRAFTSTOFFLEITUNG	connecting_hardware_for_fuel_line
X00032042	ANSCHLUSSSTUECK	connecting_piece
X00043177	PLEUELSTANGE	conrod
X00039295	KURBELWELLE	crankshaft
X00039437	KURBELWELLE	crankshaft
X59603100001	KURBELWELLE	crankshaft
X52608300013	FILTERKOPF FUER KRAFTSTOFF	filter_head
5280310745	FLANSCH FUER ABTRIEB KGS	flange
X00010945	KST-FOERDERPUMPE	fuel_delivery_pump
X00035929	KST-RUECKLAUFLEITUNG	fuel_return_line
X00040965	KST-RUECKLAUFLEITUNG	fuel_return_line
X00040962	KST-ZULAUFLEITUNG	fuel_supply_line
5501871280	GASKET	gasket
5240500705	ZWISCHENRAD	gear
5240521002	ZWISCHENRAD	gear
700327022000	TUELLE	grommet
304017008079	SECHSKANTSCHRAUBE	hex_bolt
304017008088	SECHSKANTSCHRAUBE	hex_bolt
304017008014	SECHSKANTMUTTER	hex_nut
X00034289	SCHWG-DAEM-GEHAEUSE	housing
735080018204	RUECKSCHLAGVENTIL	non_return_valve
700429024000	O-RING	o-ring
700429037000	O-RING	o-ring
700429048000	O-RING	o-ring
700429083000	O-RING	o-ring
700429150000	O-RING	o-ring
700429290000	O-RING	o-ring
700429032003	O-RING	o_ring
735221029000	O-RING	o_ring
000912008115	M 8 X 16 DIN912 SCREW PC	other_service
000912018008	M 18 X180 DIN912 SCREW PC	other_service
5240110111	CRANKSHAFT BRG CAP PC	other_service
5240110172	NUT PC	other_service
5240110440	STRIP PC	other_service
5240110570	STUD PC	other_service
5240510110	CAMSHAFT BEARING SIZE 0-0 M PC	other_service
5249970020	COVER PC	other_service
5550110259	SEAL LOWER LINER $4000	other_service
700425000161	PLATE PC	other_service
700425000169	PLATE	other_service
700425000170	PLATE	other_service
700521018201	18.2 MMN521 WASHER PC	other_service
X00007644	CRANKCASE COVER PC	other_service
X00023912	IDENTIFICATION PLATE SELF-ADHESIVE PC	other_service
X00027830	CYLINDER LINER SIZE 0 NN PC	other_service
X00028699	CRANKCASE X00028699	other_service
X00028720	CRANKCASE FOR 20V PC	other_service
X00030264	CRANKCASE X00030264	other_service
X00032068	KRAFTSTOFFLEITUNG	other_service
XS528010.00008	INSPECT PORT COVER FOR OIL DIPSTICK XS528010.00008	other_service
700325028100	ROHRKLEMMENHAELFTE	pipe_clamp_half
700325028200	ROHRKLEMMENHAELFTE	pipe_clamp_half
X00028069	KOLBEN	piston
5242370435	PLATTE	plate
000908026005	VERSCHLUSSSCHRAUBE	plug
000908052003	VERSCHLUSSSCHRAUBE	plug
735210014000	VERSCHLUSSSCHRAUBE	plug
X00040872	HALTER	retainer
X00044448	HALTER	retainer
000931012056	SECHSKANTSCHRAUBE	screw
007603014102	COPPER SEALING RING	seal
5289970045	O-RING 1657X5 O-RING PC	seal
700429018005	18 X 4 MMN429 O-RING PC	seal
700429020003	SEAL RING, 20 X 4	seal
915005016000	CAP, SEALING 16 N	seal
007603026104	DICHTRING	sealing_ring
007603052101	DICHTRING	sealing_ring
000472048000	SICHERUNGSRING	snap_ring
735186016000	VERSCHRAUBUNG	union
915013020002	STUTZEN	union
915001016004	MUTTER	union_nut
0001800015	DRUCKMINDERVENTIL	valve
5241800015	DRUCKVENTIL	valve
5280350000	SCHWINGUNGSDAEMPFER	vibration_damper
X00022366	SCHWINGUNGSDAEMPFER OHNE NEBENABTRIEB	vibration_damper
007349008002	SCHEIBE	washer
735151010100	SCHEIBE	washer

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.

Common questions

What is the oil capacity of the MTU 20 V 4000 G23?

The MTU 20 V 4000 G23 engine has an oil capacity of 390.0 liters.

What is the displacement of the MTU 20 V 4000 G23?

The MTU 20 V 4000 G23 has a displacement of 95.4 liters with 20 cylinders.

Which generators use the MTU 20 V 4000 G23 engine?

The MTU 20 V 4000 G23 powers 5 generator set(s), including MTU 20V4000 DS2750, MTU DP 2610 D5S, MTU DP 2610 D5S FW, MTU DS 2870 D5S, MTU DS 2870 D5S FW.