Engine speed not steady
Component
Probable Cause
Task
Fuel injection equip-
ment
Injector defective
Replace (→ Page 85).
Injection pump defective
Replace (→ Page 82).
Speed sensor
Defective
Contact Service.
Fuel system
Not vented
Vent fuel system (→ Page 94).
Engine Governor
Defective
Contact Service.
Charge-air temperature too high
Component
Probable Cause
Task
Coolant
Incorrect coolant concentration
Check (MTU test kit).
Intercooler
Contaminated
Contact Service.
Engine room
Air-intake temperature too high
Check fans and air supply / ventilation
ducts.
Charge-air pressure too low
Component
Probable Cause
Task
Air supply
Air filter clogged
Check signal ring position of service in-
dicator (→ Page 107).
Intercooler
Contaminated
Contact Service.
Exhaust turbocharger
Defective
Contact Service.
Coolant leaks on intercooler
Component
Probable Cause
Task
Intercooler
Leaking, major coolant discharge
Contact Service.
Exhaust gas black
Component
Probable Cause
Task
Air supply
Air filter clogged
Check signal ring position of service in-
dicator (→ Page 107).
Fuel injection equip-
ment
Injector defective
Replace (→ Page 85).
Injection pump defective
Replace (→ Page 82).
Engine
Overloaded
Contact Service.
Exhaust gas blue
Component
Probable Cause
Task
Engine oil
Too much oil in engine
Drain engine oil (→ Page 110).
Oil separator of crankcase breather con-
taminated
Replace (→ Page 74).
Exhaust turbocharger,
cylinder head, piston
rings, cylinder liner
Defective
Contact Service.
MS15018/02E 2013-09
| Troubleshooting | 65
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