MTU 16 V 4000 C21 User Manual

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Operating Instructions

Diesel engine

12 V 4000 C10, C10R, C11, C11R

12 V 4000 C20, C20R, C21, C21R

16 V 4000 C10, C11, C11R

16 V 4000 C20, C20R, C21, C21L

MS150049/02E

Table of Contents

Questions and Answers:

W
Wendy SnyderAug 12, 2025
What to do if MTU 16 V 4000 C21 does not turn when starter is actuated?
- C
  colonandreaAug 13, 2025
  If the MTU Engine does not turn when the starter is actuated, possible causes include a low or faulty battery (in which case you should charge or replace it, refer to the manufacturer's documentation), faulty cable connections (check if they are properly secured, refer to the manufacturer's documentation), faulty engine cabling or starter, faulty assemblies or loose connectors (perform a visual inspection, refer to the manufacturer's documentation), loose plug-in connections (check plug-in connections), or a blocked running gear (in which case you should contact service).
P
Paul PetersonAug 16, 2025
What to do if MTU 16 V 4000 C21 turns but does not fire?
- L
  Laura HowellAug 17, 2025
  If the MTU Engine turns but does not fire, it could be due to poor rotation by the starter because of a low or faulty battery. In this case, charge or replace the battery, referring to the manufacturer's documentation. It could also be due to air in the fuel system, in which case you should vent the fuel system.
D
Donna RandallAug 20, 2025
Why MTU 16 V 4000 C21 produces black exhaust gas?
- C
  Christopher RhodesAug 20, 2025
  If the MTU Engine produces black exhaust gas, it might be due to a clogged air filter (check the signal ring position of the service indicator) or a faulty injector.
M
Michael McmahonAug 25, 2025
What to do if MTU 16 V 4000 C21 fires unevenly?
- C
  Christine WilsonAug 25, 2025
  If the MTU Engine fires unevenly, it could be due to a faulty injector (replace it). Another cause may be air in the fuel system, so vent the fuel system.
R
Rebecca SimsAug 27, 2025
How to increase MTU 16 V 4000 C21 Engine speed to rated?
- E
  Elizabeth MelendezAug 27, 2025
  If the MTU Engine does not reach rated speed, the fuel prefilter might be clogged (clean or replace the filter element).
R
rwarrenAug 31, 2025
How to troubleshoot white exhaust gas from MTU 16 V 4000 C21 Engine?
- J
  Jason SimmonsAug 31, 2025
  If the MTU Engine emits white exhaust gas, it may not be at operating temperature, so run the engine to reach operating temperature. Another cause might be water in the fuel; in that case, drain the fuel prefilter.
V
vbellSep 4, 2025
Why is charge air temperature too high in MTU 16 V 4000 C21 Engine?
- J
  Jeffrey WyattSep 4, 2025
  If the charge air temperature is too high in your MTU Engine, the engine coolant treatment may be incorrect, so check it using the MTU test kit. Also, the air-intake temperature may be too high, so check the fans and intake/exhaust lines.
L
Lisa JohnsonSep 8, 2025
What causes blue exhaust gas from MTU 16 V 4000 C21?
- Z
  Zachary BushSep 8, 2025
  If the MTU Engine emits blue exhaust gas, it could be due to too much oil in the engine, so drain some engine oil. Another cause could be a clogged filter element in the oil separator, so replace it.

MTU 16 V 4000 C21 Specifications

General

Brand	MTU
Model	16 V 4000 C21
Category	Engine
Language	English

Summary

Safety

Important provisions for all MTU engines or systems

General information on correct use, modifications, and spare parts.

Personnel and organizational requirements

Requirements for personnel qualifications, training, and protective equipment.

Safety regulations for maintenance and repair work

Safety measures to be taken before, during, and after maintenance.

General Information

Engine – Overview

Diagram and list of major engine components.

Technical Data

Engine data 12 V 4000 C10, C10R, C11, C11R

Technical specifications and operating data for specific 12V 4000 engine models.

Engine data 16 V 4000 C10, C11, C11R

Technical specifications and operating data for specific 16V 4000 engine models.

Engine data 12 V 4000 C20, C20R, C21, C21R

Technical specifications and operating data for other 12V 4000 engine models.

Engine data 16 V 4000 C20, C20R, C21, C21L

Technical specifications and operating data for other 16V 4000 engine models.

Engine – Main dimensions

Physical dimensions of the engine models.

Operation

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

Procedures for restarting an engine after a long period of inactivity.

Starting the engine in manual mode

Step-by-step guide for starting the engine manually.

Stopping the engine in manual mode

Procedure for safely shutting down the engine manually.

Maintenance

Maintenance task reference table [QL1]

Reference table linking maintenance tasks to specific procedures and page numbers.

Troubleshooting

Troubleshooting

Guide for diagnosing and resolving common engine problems.

Fault messages from DDEC engine governor

Interpreting fault codes and messages from the DDEC system.

Task Description

Cylinder liner – Endoscopic examination

How to perform an endoscopic examination of cylinder liners.

Valve clearance – Check and adjustment

Procedure for checking and adjusting valve clearance.

Injector – Removal and installation

Detailed steps for removing and installing injectors.

Fuel filter – Replacement

How to replace the fuel filter.

Engine oil – Level check

How to check the engine oil level.

Engine oil – Change

Procedure for changing the engine oil.

Engine oil filter – Replacement

How to replace the engine oil filter.

Engine coolant – Level check

How to check the engine coolant level.

Engine coolant – Change

Procedure for changing the engine coolant.

Battery-charging generator – Removal and installation

Procedure for removing and installing the battery-charging generator.

Appendices

Abbreviations

List of abbreviations used in the manual with their meanings.

Special Tools

List of special tools required for maintenance procedures.

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