Engine speed not steady
Cause Corrective action
Injector is faulty. u Replace (→ Page 88).
Injection pump is faulty. u Replace (→ Page 84).
Speed sensor is faulty. u Contact Service.
Air in fuel system u Vent fuel system (→ Page 100).
Engine governor is faulty. u Contact Service.
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 fans and air supply / ventilation ducts.
Charge-air pressure too low
Cause Corrective action
Air filter clogged. u Check signal ring position of contamination indicator (→ Page 114).
Charge-air cooler is contaminated. u Contact Service.
Exhaust turbocharger is 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 114).
Injector is faulty. u Replace (→ Page 88).
Injection pump is faulty. u Replace (→ Page 84).
Overload. u Contact Service.
68 | Troubleshooting | MS15018/03E 2016-02
TIM-ID: 0000066976 - 001
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