Engine speed not steady
Cause Corrective action
Fuel injection: Injector defective u Replace (→ Page 80).
Speed transmitter defective u Contact Service.
Air in fuel system u Vent fuel system (→ Page 83).
Engine Control Unit defective u Contact Service.
Charge-air temperature too high
Cause Corrective action
Incorrect coolant concentration u Check (MTU test kit).
Charge-air cooler clogged 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 96).
Charge-air cooler contaminated u Contact Service.
Exhaust turbocharger defective u Contact Service.
Coolant leaks at charge-air cooler
Cause Corrective action
Charge-air cooler leaking, 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 96).
Fuel injection: Injector defective u Replace (→ Page 80).
Engine: Overload u Contact Service.
Blue exhaust gas
Cause Corrective action
Too much engine oil in the engine u Drain engine oil (→ Page 99).
Oil separator or oil pre-separator
of crankcase breather clogged
1. Clean preseparator (→ Page 73).
2. Replace oil separator element (→ Page 74).
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u Contact Service.
58 | Troubleshooting | MS150063/03E 2016-02
TIM-ID: 0000044001 - 002
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