Troubleshooting - MTU 12 V 4000 G73 Operating Instructions Manual

6 Troubleshooting

6.1 Troubleshooting
Engine does not turn when starter is actuated
Component
Battery
Starter
Engine cabling
Engine/generator
control
Engine governor
Engine
Engine turns but does not fire
Component
Starter
Engine cabling
Fuel system
Engine governor
Engine fires unevenly
Component
Fuel injection equip-
ment
Engine cabling
Fuel system
Engine governor
Engine does not reach rated speed
Component
Fuel supply
Air supply
Fuel injection equip-
ment
Cause
Low or faulty
Cable connections defective
Engine wiring or starter defective
Faulty
Secure seating of assemblies or connec-
tors not provided
Plug-in connections are loose
Running gear blocked (engine cannot be
barred manually).
Cause
Poor rotation by starter: Battery low or
defective.
Faulty
Air in fuel system.
Faulty
Cause
Injector faulty.
Faulty
Air in fuel system.
Faulty
Cause
Fuel prefilter clogged.
Easy-change fuel filter clogged
Air filter clogged.
Injector faulty.
Action
Charge or replace (see manufacturer's
documentation).
Check if cable connections are properly
secured (see manufacturer's documen-
tation).
Check if cable connections are properly
secured, contact Service.
Check (→ Page 162).
Perform visual inspection (see manufac-
turer's documentation).
Check plug-in connections (→ Page 165).
Contact Service.
Action
Charge or replace battery (see manufac-
turer's documentation).
Check (→ Page 162).
Vent fuel system (→ Page 105).
Contact Service.
Action
Replace (→ Page 99).
Check (→ Page 162).
Vent fuel system (→ Page 105).
Contact Service.
Action
Replace
Replace (→ Page 106).
Check signal ring position of service in-
dicator (if fitted) .
Replace (→ Page 99).
MS150029/02E 2013-03 | Troubleshooting | 39