Engine speed not steady
Cause
Corrective action
Injector faulty.
u
Replace (→ Page 80).
Injection pump faulty.
u
Contact Service.
Speed sensor is faulty.
u
Contact Service.
Air in fuel system.
u
Vent fuel system (→ Page 83).
Charge-air temperature too high
Cause
Corrective action
Incorrect engine coolant
concentration.
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 95).
Charge-air cooler is
contaminated.
u
Contact Service.
Exhaust turbocharger faulty.
u
Contact Service.
Coolant leaks at intercooler
Cause
Corrective action
Major coolant discharge at
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 95).
Injector faulty.
u
Replace (→ Page 80).
Injection pump faulty.
u
Contact Service.
Overload.
u
Contact Service.
58 | Troubleshooting | MS150119/00E 2014-08
TIM-ID: 0000055288 - 001
