MTU 12V4000Bx4 User Manual (English)

Questions and Answers:

H
Holly HughesAug 19, 2025
How to fix an MTU 12V4000Bx4 that won't turn over?
- J
  julia67Aug 20, 2025
  If your MTU Engine doesn't turn over when you try to start it, here are a few things to check: * Make sure the battery isn't low or faulty by charging or replacing it. * Check the cable connections to make sure they are secure. * For electric starters, verify the engine cabling or starter isn't faulty and that cable connections are properly secured. If issues persist, contact Service. * For compressed air starters, check the starting valve or starter cabling and ensure connections are secure. If problems continue, contact Service. * Inspect the engine wiring. Also, check the engine/generator control assemblies and connectors for looseness, and the engine governor plug-in connections. If the running gear is blocked, contact Service.
J
john58Aug 21, 2025
What to do if my MTU 12V4000Bx4 turns over but won't start?
- R
  rachel52Aug 21, 2025
  If your MTU Engine turns over but doesn't fire, consider these potential causes: * A low or faulty battery can cause poor rotation with an electric starter; charge or replace the battery. * Low pressure can cause poor rotation with an air starter; check the compressed air system. * Also, the engine wiring may be faulty. If these aren't the cause, contact Service.
D
davislauraAug 23, 2025
Why my MTU 12V4000Bx4 Engine does not reach nominal speed?
- A
  Angel AndersonAug 25, 2025
  If your MTU Engine isn't reaching its nominal speed, it could be due to several reasons: * A clogged fuel prefilter (either switchable or not switchable) or fuel filter. * A clogged air filter; check the service indicator. Also, the engine wiring may be faulty. If these aren't the cause, contact Service.
L
Lauren BriggsAug 26, 2025
How to troubleshoot unsteady MTU Engine speed?
- J
  Jennifer FlemingAug 26, 2025
  If your MTU Engine speed is unsteady, here are some potential causes: * A defective injector. * Air in the fuel system. If these aren't the cause, contact Service.
R
Richard MitchellAug 28, 2025
Why is my MTU 12V4000Bx4 producing black exhaust gas?
- P
  Patricia WangAug 28, 2025
  Black exhaust gas from your MTU Engine can be caused by: * A clogged air filter; check the service indicator. * A defective injector. If these aren't the cause, contact Service.
J
Joseph RossAug 29, 2025
What causes high charge-air temperature in an MTU 12V4000Bx4 Engine?
- L
  Lindsey HumphreyAug 30, 2025
  High charge-air temperature in your MTU Engine can result from: * Incorrect engine coolant treatment; check using the MTU test kit. * High air-intake temperature in the engine room; check fans and intake/exhaust lines. If these aren't the cause, contact Service.
W
William HallAug 31, 2025
What to do if MTU Engine fires unevenly?
- K
  kristintownsendAug 31, 2025
  If your MTU Engine is firing unevenly, consider these potential causes: * A defective injector. * Faulty engine wiring. * Air in the fuel system. If these aren't the cause, contact Service.
G
gina91Sep 3, 2025
Why is the charge-air pressure too low in my MTU 12V4000Bx4?
- G
  greenewayneSep 3, 2025
  Low charge-air pressure in your MTU Engine could be due to: * Leaking air pipework; check for leakage. * A clogged air filter; check the service indicator. If these aren't the cause, contact Service.
M
Miranda NealSep 5, 2025
Why is my MTU 12V4000Bx4 emitting white exhaust gas?
- A
  Alyssa RobinsonSep 5, 2025
  White exhaust gas from your MTU Engine can be caused by: * The engine not being at operating temperature; run the engine until it reaches operating temperature. * Water in the fuel; check the fuel system and drain water from the fuel prefilter (both switchable and non-switchable types). If these aren't the cause, contact Service.
C
Connie ParksSep 6, 2025
What causes blue exhaust gas from an MTU 12V4000Bx4?
- S
  Stephen WareSep 7, 2025
  Blue exhaust gas from your MTU Engine could indicate: * Too much engine oil; drain the engine oil. * A contaminated oil separator of the crankcase breather; replace the filter. If these aren't the cause, contact Service.

MTU 12V4000Bx4 Specifications

General

Brand	MTU
Model	12V4000Bx4
Category	Engine
Language	English

Summary

Safety

Important provisions for all products

General safety guidelines, nameplates, and emission specifications for all products.

Gendrive engines – Intended use

Defines the intended use and operational parameters for Gendrive engines.

Personnel and organizational requirements

Outlines requirements for personnel, training, and organizational measures for safe operation.

Safety regulations for initial start-up and operation

Safety guidelines for initial start-up, operation, malfunctions, and emergency stops.

Safety regulations for assembly, maintenance, and repair work

Safety regulations for work prior to, during, and after assembly, maintenance, and repair.

Transport

Technical Data

Product data 12V4000B14S, application 3A; 12V4000B24F, application 3A; 12V4000B24S, application 3A

Product data 12V4000G14F, application 3B

Product data 12V4000G14F, application 3E

Product data 12V4000G14F, application 3F

Product data 12V4000G14F, application 3G

Product data 12V4000G14RF, application 3B

Product data 12V4000G14S, applications 3B, 3F, 3G

Product data 12V4000G24F, application 3B

Product data 16V4000B24F, application 3A; 16V4000B14S, application 3A; 16V4000B24S, application 3A

Operation

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

Steps to put the engine into operation after extended periods of inactivity (over 3 months).

Starting the engine in manual mode (test run)

Instructions for starting the engine in manual mode for testing purposes.

Re-starting the engine following an automatic safety shutdown

Procedure for safely restarting the engine after an automatic safety shutdown.

Emergency engine start (Override mode)

Steps for initiating an emergency engine start using the override mode.

Operational monitoring

Guidelines for monitoring engine operation, checking various systems and components.

Engine – Stopping in Manual mode (test run)

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

Engine – Emergency stop

Procedure for performing an emergency engine stop from the LOP.

Maintenance

Maintenance task reference table [QL1]

Troubleshooting

Lists common engine problems, their causes, and corrective actions for various scenarios.

Fault messages of Engine Control Unit ECU9 for Series 4000, genset applications

Details fault messages from ECU9, including possible engine responses and corrective actions.

Task Description

Engine – Test run

Steps for performing an engine test run, including starting, load, checks, and stopping.

Valve clearance – Check and adjustment

Procedure for checking and adjusting valve clearance at two crankshaft positions.

Injector – Removal and installation

Detailed steps for removing and installing injectors, including safety precautions and tool usage.

Injector rings – Replacement

Procedure for replacing injector rings, including special tools, materials, and safety warnings.

Fuel filter – Replacement

Steps for replacing the engine oil filter, including tools, materials, and safety warnings.

Fuel prefilter (non-switchable) – Filter element replacement

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

Fuel prefilter (switchable) – Filter element replacement

Steps for replacing the filter element in the switchable fuel prefilter.

Air filter ‒ Replacement

Steps for removing and installing a new air filter and resetting the service indicator.

Engine oil – Change

Steps for changing the engine oil, including preconditions, special tools, and draining procedures.

Engine oil level – Check

Procedure for checking the engine oil level after extended standstill and immediately after engine stop.

Engine oil – Sample extraction and analysis

Oil Filtration / Cooling

Engine coolant – Level check

Procedures for checking the engine coolant level at the remote cooler and via the level sensor.

Engine coolant – Change

Engine coolant – Draining

Procedure for draining engine coolant, including identification of drain points and safety precautions.

Engine coolant – Filling

Charge-air coolant level – Check

Charge-air coolant – Change

Charge-air coolant – Draining

Procedure for draining charge-air coolant from various points and cleaning surfaces.

Charge-air coolant – Filling

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MTU 12V4000Bx4 User Manual

Table of Contents

Questions and Answers:

MTU 12V4000Bx4 Specifications

Summary

Safety

Important provisions for all 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

Transport

Technical Data

Product data 12V4000B14S, application 3A; 12V4000B24F, application 3A; 12V4000B24S, application 3A

Product data 12V4000G14F, application 3B

Product data 12V4000G14F, application 3E

Product data 12V4000G14F, application 3F

Product data 12V4000G14F, application 3G

Product data 12V4000G14RF, application 3B

Product data 12V4000G14S, applications 3B, 3F, 3G

Product data 12V4000G24F, application 3B

Product data 16V4000B24F, application 3A; 16V4000B14S, application 3A; 16V4000B24S, application 3A

Operation

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

Starting the engine in manual mode (test run)

Re-starting the engine following an automatic safety shutdown

Emergency engine start (Override mode)

Operational monitoring

Engine – Stopping in Manual mode (test run)

Engine – Emergency stop

Maintenance

Maintenance task reference table [QL1]

Troubleshooting

Troubleshooting

Fault messages of Engine Control Unit ECU9 for Series 4000, genset applications

Task Description

Engine – Test run

Valve clearance – Check and adjustment

Injector – Removal and installation

Injector rings – Replacement

Fuel filter – Replacement

Fuel prefilter (non-switchable) – Filter element replacement

Fuel prefilter (switchable) – Filter element replacement

Air filter ‒ Replacement

Engine oil – Change

Engine oil level – Check

Engine oil – Sample extraction and analysis

Oil Filtration / Cooling

Engine coolant – Level check

Engine coolant – Change

Engine coolant – Draining

Engine coolant – Filling

Charge-air coolant level – Check

Charge-air coolant – Change

Charge-air coolant – Draining

Charge-air coolant – Filling

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