Engine speed not steady
Cause Corrective action
Fuel injection: Injector faulty u Replace (→ Page 92).
Speed transmitter defective u Contact Service.
Air in fuel system u Vent fuel system (→ Page 95).
Engine Control Unit defective u Contact Service.
Charge-air temperature too high
Cause Corrective action
Incorrect coolant concentration u Check (MTU test kit).
Intercooler dirty 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 108).
Intercooler dirty u Contact Service.
Exhaust turbocharger defective u Contact Service.
Coolant leaks at intercooler
Cause Corrective action
Intercooler leakíng, 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 108).
Fuel injection: Injector faulty u Replace (→ Page 92).
Engine: Overload u Contact Service.
Blue exhaust gas
Cause Corrective action
Too much oil in engine u Drain engine oil (→ Page 111).
Oil separator or oil-preseparator
of crankcase breather clogged
1. Clean preseparator (→ Page 86).
2. Replace oil separator element (→ Page 87).
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u Contact Service.
M015650/05E 2014-03 | Troubleshooting | 71
TIM-ID: 0000044001 - 001
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