Engine speed not steady
Component
Probable Cause
Action
Fuel injection equip-
ment
Injector faulty
Replace (→ Page 48).
Injection pump faulty
Contact Service.
Speed sensor
Faulty
Contact Service.
Fuel system
Air in fuel system
Vent fuel system (→ Page 58).
Engine governor
Faulty
Contact Service.
Charge air temperature too high
Component
Probable Cause
Action
Engine coolant
Engine coolant treatment incorrect
Check (MTU test kit).
Intercooler
Contaminated
Contact Service.
Engine room
Air-intake temperature too high
Check fans and intake/exhaust lines.
Charge-air pressure too low
Component
Probable Cause
Action
Air supply
Air filter clogged
Check signal ring position of service in-
dicator (→ Page 68).
Intercooler
Contaminated
Contact Service.
Exhaust turbocharger
Faulty
Contact Service.
Coolant leaks at intercooler
Component
Probable Cause
Action
Intercooler
Leaking, major coolant discharge
Contact Service.
Black exhaust gas
Component
Probable Cause
Action
Air supply
Air filter clogged
Check signal ring position of service in-
dicator (→ Page 68).
Fuel injection equip-
ment
Injector faulty
Replace (→ Page 48).
Injection pump faulty
Contact Service.
Engine
Overloaded
Contact Service.
Blue exhaust gas
Component
Probable Cause
Action
Engine oil
Engine oil level too high
Drain engine oil (→ Page 72).
Oil separator of crankcase breather con-
taminated
Replace (→ Page 44).
Exhaust turbocharger,
cylinder head, piston
rings, cylinder liner
Faulty
Contact Service.
40 | Troubleshooting | MS150111/01E 2014-05
TIM-ID: 0000051898 - 001
