Engine speed not steady
Cause
Corrective action
Injector defective
u
Speed transmitter defective
u
Contact Service.
Air in fuel system
u
Vent fuel system (→ Page 102).
DDEC defective
u
Contact Service.
Charge-air temperature too high
Cause
Corrective action
Engine coolant treatment
incorrect
u
Check (→ MTU test kit)
Intercooler contaminated
u
Contact Service.
Engine room: Air-intake
temperature too high
u
Check fans and intake/exhaust lines.
Charge-air pressure too low
Cause
Corrective action
Air filter clogged
u
Check signal ring position of contamination indicator (→ Page 107).
Intercooler contaminated
u
Contact Service.
Exhaust turbocharger defective
u
Contact Service.
Coolant leaks at intercooler
Cause
Corrective action
Intercooler leaky, major coolant
discharge
u
Contact Service.
Exhaust gas black
Cause
Corrective action
Air filter clogged
u
Check signal ring position of contamination indicator (→ Page 107).
Injector defective
u
Engine load too high
u
Contact Service.
Exhaust gas blue
Cause
Corrective action
Too much engine oil in the engine
u
Drain engine oil (→ Page 110).
Filter element in oil separator is
clogged
u
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u
Contact Service.
54 | Troubleshooting | MS150049/04E 2017-04
TIM-ID: 0000002542 - 005
