Engine speed not steady
Cause
Corrective action
Fuel injection: Injector faulty
u
Replace (→ Page 87).
Speed transmitter defective
u
Contact Service.
Air in fuel system
u
Vent fuel system (→ Page 90).
Engine Control Unit defective
u
Contact Service.
Charge-air temperature too high
Cause
Corrective action
Incorrect coolant concentration
u
Check (MTU test kit).
Intercooler dirty
u
Contact Service.
Engine room: Air-intake
temperature too high
u
Check fans and air supply/ventilation ducts.
Charge-air pressure too low
Cause
Corrective action
Air supply: Air filter clogged
u
Check signal ring position of service indicator (→ Page 103).
Intercooler dirty
u
Contact Service.
Exhaust turbocharger defective
u
Contact Service.
Coolant leaks at intercooler
Cause
Corrective action
Intercooler leakíng, major
coolant discharge
u
Contact Service.
Black exhaust gas
Cause
Corrective action
Air supply: Air filter clogged
u
Check signal ring position of service indicator (→ Page 103).
Fuel injection: Injector faulty
u
Replace (→ Page 87).
Engine: Overload
u
Contact Service.
Blue exhaust gas
Cause
Corrective action
Too much oil in engine
u
Drain engine oil (→ Page 106).
Oil separator or oil-preseparator
of crankcase breather clogged
1. Clean preseparator (→ Page 81).
2. Replace oil separator element (→ Page 82).
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u
Contact Service.
66 | Troubleshooting | MS150063/02E 2014-03
TIM-ID: 0000044001 - 001
