Engine speed not steady
Cause
Corrective action
Injector faulty
u
Replace (→ Page 88).
Injection pump faulty
u
Contact Service.
Speed sensor is faulty.
u
Contact Service.
Air in fuel system
u
Vent fuel system (→ Page 94).
Charge-air temperature too high
Cause
Corrective action
Engine coolant treatment
incorrect
u
Check (MTU test kit).
Charge-air cooler is contaminated.
u
Contact Service.
Air inlet temperature in engine
room is too high.
u
Check fan
Check air inlet/outlet ducts.
Charge-air pressure too low
Cause
Corrective action
Air filter clogged.
u
Check signal ring position of contamination indicator (→ Page 116).
Charge-air cooler is contaminated.
u
Contact Service.
Exhaust turbocharger faulty.
u
Contact Service.
Coolant leaks at charge-air cooler
Cause
Corrective action
Major coolant discharge at drain
valve of the charge-air cooler.
Charge-air cooler leaky.
u
Contact Service.
Black exhaust gas
Cause
Corrective action
Air filter clogged.
u
Check signal ring position of contamination indicator (→ Page 116).
Injector faulty.
u
Replace (→ Page 88).
Injection pump faulty.
u
Contact Service.
Blue exhaust gas
Cause
Corrective action
Too much engine oil in the engine
u
Drain engine oil (→ Page 119)
Exhaust turbocharger faulty.
u
Contact Service.
Cylinder head is faulty.
u
Contact Service.
Piston rings are defective.
u
Contact Service.
Cylinder liner defective.
u
Contact Service.
64 | Troubleshooting | MS150119/01E 2016-02
TIM-ID: 0000055288 - 003
