Component Cause Measure
Engine wiring Faulty Check (→ Page 189).
Engine Overloaded Contact Service.
Engine speed not steady
Component Cause Measure
Fuel injection equip-
ment
Injector faulty. Replace (→ Page 117).
Speed sensor Faulty Contact Service.
Fuel system Air in fuel system. Vent fuel system (→ Page 122).
Engine governor Faulty Contact Service.
Charge-air temperature too high
Component Cause Measure
Coolant Coolant treatment incorrect. Check (MTU test kit).
Intercooler Contaminated Contact Service.
Engine room Inlet air temperature too high. Check fans and air supply / ventilation
ducts.
Charge-air pressure too low
Component Cause Measure
Air supply Air filter clogged. Check
Intercooler Contaminated Contact Service.
Exhaust turbocharger Faulty Contact Service.
Coolant discharge at intercooler
Component Cause Measure
Intercooler Leaking, major coolant discharge. Contact Service.
Blue exhaust gas
Component Cause Measure
Engine oil Too much oil in engine. Drain engine oil (→ Page 155).
Oil separator of crankcase breather con-
taminated.
Replace filter.
Exhaust turbocharger,
cylinder head, piston
rings, cylinder liner
Faulty Contact Service.
White exhaust gas
Component Cause Measure
Engine Not at operating temperature. Run up to operating temperature.
Fuel system Water in fuel. Check fuel system on fuel prefilter.
Drain fuel prefilter.
Intercooler Leaking Contact Service.
36 | Troubleshooting | MS150112/01E 2014-10
TIM-ID: 0000018860 - 005
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