MTU 12V4000G34F User Manual (English)

Questions and Answers:

A
Adam SmithAug 17, 2025
Why MTU 12V4000G34F Engine does not turn when starter is actuated?
- P
  Preston MedinaAug 17, 2025
  If your MTU Engine doesn't turn over when you try to start it, several things could be the culprit. It could be due to a low or faulty battery, so you should charge or replace it. Also, check the cable connections to ensure they are secure. For electric starters, the engine cabling or starter itself might be faulty, so check the cable connections. For compressed air starters, the starting valve cabling or the starter could be defective, so check whether cable connections are properly secured. Other potential issues include faulty engine wiring, loose assemblies or connectors in the engine/generator control, or loose plug-in connections in the engine governor. If none of these resolve the issue, contact service.
B
Brittany WilliamsonAug 20, 2025
What to do if MTU 12V4000G34F Engine turns on starting but does not fire?
- V
  Virginia WagnerAug 20, 2025
  If your MTU Engine turns on starting but does not fire, it could be due to several reasons. If you have an electric starter, a low or faulty battery could cause poor rotation, so charge or replace the battery. If you have an air starter, low pressure could be the issue, so check the compressed air system. Other potential causes include faulty engine wiring or air in the fuel system. You can vent the fuel system. If the engine governor is defective, contact service.
K
Kimberly CharlesAug 23, 2025
Why MTU Engine emits black exhaust gas?
- J
  Jose BallAug 23, 2025
  Black exhaust gas from your MTU Engine can be caused by a few issues. The air filter might be clogged, so check the signal ring position of the service indicator. Also, the injector could be defective and may need replacement. In case of engine overload, contact service.
U
uscottAug 26, 2025
What causes MTU 12V4000G34F Engine to fire unevenly?
- M
  Michael WilkersonAug 26, 2025
  Uneven firing in your MTU Engine can stem from a few sources. A defective injector could be the cause, so check and replace it if necessary. Faulty engine wiring can also lead to this issue. Additionally, air in the fuel system might be the problem, so vent the fuel system. If none of these resolve the issue, the engine governor might be defective, and it's best to contact service.
G
George StewartAug 28, 2025
How to fix if MTU 12V4000G34F does not reach nominal speed?
- D
  Devin QuinnAug 28, 2025
  If your MTU Engine isn't reaching its nominal speed, several factors could be responsible. A clogged fuel prefilter (either switchable or non-switchable) is a common cause, so replace it. A clogged fuel filter can also restrict performance, so replace it. Check the signal ring position of the service indicator, as it may indicate a clogged air filter. Other potential issues include a defective injector (replace it), faulty engine wiring. In case of engine overload, contact service.
J
Jessica VaughnAug 31, 2025
What causes high charge-air temperature in MTU 12V4000G34F Engine?
- M
  Madison GarciaAug 31, 2025
  High charge-air temperature in your MTU Engine can be attributed to a few reasons. The engine coolant treatment might be incorrect, so check it using the MTU test kit. Additionally, a dirty intercooler can cause this issue. Also, check the fans and intake/exhaust lines, as the engine room air-intake temperature may be too high.
L
Lisa AdamsSep 2, 2025
Why is MTU Engine speed not steady?
- A
  Ashley LevySep 3, 2025
  Unsteady engine speed in your MTU Engine can arise from several causes. A defective injector could be the culprit, so replace it. The speed transmitter might also be defective, so contact service. Air in the fuel system can also lead to this issue, so vent the fuel system. If none of these steps resolve the problem, the engine governor might be defective, and you should contact service.
S
Stephanie McconnellSep 5, 2025
What causes low charge-air pressure in MTU 12V4000G34F Engine?
- J
  Joseph OrtegaSep 5, 2025
  Low charge-air pressure in your MTU Engine can be due to several factors. Leaking air pipework is a common cause, so check the air pipework for leakage. A clogged air filter can also restrict pressure, so check the signal ring position of the service indicator. Other potential issues include a dirty intercooler or a defective exhaust turbocharger, so contact service.
C
Chase ReidSep 8, 2025
Why MTU Engine emits white exhaust gas?
- B
  Brittany PrestonSep 8, 2025
  White exhaust gas from your MTU Engine can indicate several issues. The engine may not be at its operating temperature, so run the engine to reach it. Water in the fuel can also cause this, so check the fuel system on the fuel prefilter and drain water from the fuel prefilter (both switchable and non-switchable types). Also, the intercooler might be leaky, so contact service.
M
Michael ParkerSep 12, 2025
What does blue exhaust gas from MTU 12V4000G34F Engine mean?
- S
  Stephanie MorrisonSep 12, 2025
  Blue exhaust gas from your MTU Engine can point to a few problems. There might be too much engine oil in the engine, so drain some oil. The oil separator of the crankcase breather could be contaminated, so replace the filter. In case of a defective exhaust turbocharger, cylinder head, piston rings, or cylinder liner, contact service.

MTU 12V4000G34F Specifications

General

Engine Model	12V4000G34F
Engine Type	Diesel
Configuration	V12
Speed	1800 rpm
Bore	170 mm
Compression Ratio	16.5:1
Aspiration	Turbocharged and Intercooled
Cooling System	Liquid Cooled
Emission Standards	IMO Tier II

Summary

Safety

Important provisions for all products

General safety instructions and nameplate information for all products.

Important requirements for Power Generation application products

Requirements for operational environment, residual hazards, hot surfaces, and noise.

Gendrive engines – Intended use

Personnel and organizational requirements

Specifies requirements for personnel qualification and protective equipment.

Safety regulations for initial start-up and operation

Safety measures for initial startup, operation, and emergency stops.

Safety regulations for assembly, maintenance, and repair work

Safety procedures for assembly, maintenance, repair, lifting, and cleaning.

Fire and environmental protection, fluids and lubricants

Guidelines for fire prevention, noise, environmental protection, and handling fluids.

Transport

Functional Description

Fuel system with Common Rail injection

Description of the fuel system and its low and high-pressure components.

Lube oil system

Description of the lube oil system, including pumps, filters, and heat exchangers.

Cooling system

Overview of the high-temperature and low-temperature coolant circuits.

Engine management and monitoring

Explanation of the engine monitoring system and the ECU 9 governor.

Operation

Putting the engine into operation after extended out-of-service periods (>3 months)

Procedure for bringing the engine back into operation after long periods of inactivity.

Putting into operation after scheduled out-of-service-period

Starting the engine in manual mode (test run)

Procedure for starting the engine in manual mode for test runs.

Re-starting the engine following an automatic safety shutdown

Instructions for safely restarting the engine after an automatic shutdown.

Safety system – Override

Description of the override function for safety systems and emergency starts.

Operational monitoring

Guidelines for monitoring engine operation and key parameters.

Emergency engine start (Override mode)

Procedure for starting the engine in emergency situations using override mode.

Stopping the engine in manual mode (test run)

Procedure for stopping the engine in manual mode after a test run.

Emergency engine stop

Procedure for performing an emergency engine stop.

Maintenance

Maintenance task reference table [QL1]

Table listing maintenance tasks, items, options, and page references.

Troubleshooting

Guides for diagnosing and resolving engine issues.

Fault messages of the ADEC (ECU 9) engine governor for Series 4000 genset engines

Lists fault messages and corrective actions for the ADEC ECU 9.

Task Description

Engine – Barring manually

Engine – Cranking on starting system

Engine – Test run

Procedure for performing an engine test run.

Injection Pump / HP Pump

HP fuel pump – Filling with engine oil

Procedure for filling the HP fuel pump with engine oil.

Injector

Injector – Replacement

General instructions for injector replacement.

Injector – Removal and installation

Detailed steps for removing and installing injectors.

Injector rings – Replacement

Procedure for replacing injector rings.

Fuel Filter

Fuel filter – Replacement

Procedure for replacing the fuel filter.

Additional fuel filter – Replacement

Procedure for replacing the additional fuel filter.

Fuel prefilter – Filter element replacement

General instructions for replacing fuel prefilter elements.

Fuel prefilter (switchable) – Filter element replacement

Procedure for replacing the filter element of a switchable fuel prefilter.

Fuel prefilter (non-switchable) – Filter element replacement

Procedure for replacing the filter element of a non-switchable fuel prefilter.

Air Filter

Air filter ‒ Replacement

Procedure for removing and installing a new air filter.

Lube Oil System, Lube Oil Circuit

Engine oil – Change

Procedure for changing the engine oil, including draining and filling.

Engine oil level – Check

Oil Filtration / Cooling

Engine oil filter – Replacement

Coolant Circuit, General, High-Temperature Circuit

Engine coolant – Level check

Engine coolant – Change

Engine coolant – Draining

Engine coolant – Filling

Low-Temperature Circuit

Charge-air coolant level – Check

Charge-air coolant – Change

Charge-air coolant – Draining

Charge-air coolant – Filling

Accessories for (Electronic) Engine Governor / Control System

Parameters for drift correction (CDC) – Resetting with DiaSys®

Appendix A

Tightening specifications for screws, nuts and bolts

Specifications for tightening torques of various screws, nuts, and bolts.

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MTU 12V4000G34F User Manual

Table of Contents

Questions and Answers:

MTU 12V4000G34F Specifications

Summary

Safety

Important provisions for all products

Important requirements for Power Generation application products

Gendrive engines – Intended use

Personnel and organizational requirements

Safety regulations for initial start-up and operation

Safety regulations for assembly, maintenance, and repair work

Fire and environmental protection, fluids and lubricants

Transport

Functional Description

Fuel system with Common Rail injection

Lube oil system

Cooling system

Engine management and monitoring

Operation

Putting the engine into operation after extended out-of-service periods (>3 months)

Putting into operation after scheduled out-of-service-period

Starting the engine in manual mode (test run)

Re-starting the engine following an automatic safety shutdown

Safety system – Override

Operational monitoring

Emergency engine start (Override mode)

Stopping the engine in manual mode (test run)

Emergency engine stop

Maintenance

Maintenance task reference table [QL1]

Troubleshooting

Troubleshooting

Fault messages of the ADEC (ECU 9) engine governor for Series 4000 genset engines

Task Description

Engine – Barring manually

Engine – Cranking on starting system

Engine – Test run

Injection Pump / HP Pump

HP fuel pump – Filling with engine oil

Injector

Injector – Replacement

Injector – Removal and installation

Injector rings – Replacement

Fuel Filter

Fuel filter – Replacement

Additional fuel filter – Replacement

Fuel prefilter – Filter element replacement

Fuel prefilter (switchable) – Filter element replacement

Fuel prefilter (non-switchable) – Filter element replacement

Air Filter

Air filter ‒ Replacement

Lube Oil System, Lube Oil Circuit

Engine oil – Change

Engine oil level – Check

Oil Filtration / Cooling

Engine oil filter – Replacement

Coolant Circuit, General, High-Temperature Circuit

Engine coolant – Level check

Engine coolant – Change

Engine coolant – Draining

Engine coolant – Filling

Low-Temperature Circuit

Charge-air coolant level – Check

Charge-air coolant – Change

Charge-air coolant – Draining

Charge-air coolant – Filling

Accessories for (Electronic) Engine Governor / Control System

Parameters for drift correction (CDC) – Resetting with DiaSys®

Appendix A

Tightening specifications for screws, nuts and bolts

Related product manuals