MTU 12 V 4000 G21R, Operating Instructions Manual

Page: 29 / 117

6 Troubleshooting
6.1 Troubleshooting
Engine does not turn when starter is actuated
Component Probable cause Task
Battery Low or defective Charge or replace (see manufacturer's
documentation).
Cable connections defective Check if cable connections are proper‐
ly secured (see manufacturer's docu‐
mentation).
Starter (electric) Engine wiring or starter defective Check cable connections for secure
seating,
Contact Service.
Starter (compressed
air)
Cabling on starting valve or starter de‐
fective
Check cable connections for secure
seating,
Contact Service.
Engine wiring Defective Check (→ Page 125).
Engine/generator
control system
Secure seating of assemblies or con‐
nectors not provided
Perform visual inspection (see manu‐
facturer's documentation).
Engine Governor Plug-in connections are loose Check plug connections (→ Page 127).
Engine Running gear blocked (engine cannot
be barred manually)
Contact Service.
Engine turns but does not fire
Component Probable cause Task
Starter (electric) Poor rotation by starter: Battery low or
defective
Charge or replace battery (see manu‐
facturer's documentation).
Starter (compressed
air)
Poor rotation by starter: Air pressure
too low
Check compressed air system.
Engine wiring Defective Check (→ Page 125).
Fuel system Not vented Vent fuel system (→ Page 83).
Engine Governor Defective Contact Service.
Engine fires unevenly
Component Probable cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 77).
Engine wiring Defective Check (→ Page 125).
Fuel system Not vented Vent fuel system (→ Page 83).
Engine Governor Defective Contact Service.
48 | Troubleshooting | MS150064/01E 2011-11
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