Engine speed not steady
Cause
Corrective action
Fuel injection: Injector faulty
u
Replace (→ Page 143).
Speed transmitter defective
u
Contact Service.
Engine governor 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 172).
Intercooler dirty
u
Contact Service.
Exhaust turbocharger defective
u
Contact Service.
Coolant leaks at intercooler
Cause
Corrective action
Intercooler leaky, 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 172).
Fuel injection: Injector faulty
u
Replace (→ Page 143).
Engine: Overload
u
Contact Service.
Blue exhaust gas
Cause
Corrective action
Too much oil in engine
u
Drain engine oil (→ Page 175).
Oil separator or oil-preseparator
of crankcase breather clogged
u
Replace.
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u
Contact Service.
MS150035/01E 2013-11 | Troubleshooting | 99
TIM-ID: 0000010520 - 004
