Operating instructions

Engine speed not steady
Component Cause Action
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 48).
Speed sensor Faulty Contact Service.
Fuel system Air in fuel system, if fault occurs after
filling the system.
Vent fuel system (→ Page 56).
Engine governor Faulty Contact Service.
Charge-air temperature too high
Component Cause Action
Engine coolant Engine coolant treatment incorrect Check (MTU test kit).
Intercooler Contaminated Contact Service.
Engine room Air-intake temperature too high Check fan;
check air inlet/outlet ducts.
Charge-air pressure too low
Component Cause Action
Air supply Air filter clogged Replace air filter (see manufacturer's
documentation).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Faulty Contact Service.
Coolant leaks at intercooler
Component Cause Action
Intercooler Leaking, major coolant discharge Contact Service.
Black exhaust gas
Component Cause Action
Air supply Air filter clogged Replace air filter (see manufacturer's
documentation).
Fuel injection equip‐
ment
Injector faulty Replace (→ Page 48).
Engine Overloaded Contact Service.
Blue exhaust gas
Component Cause Action
Engine oil Too much oil in engine Drain engine oil (→ Page 70).
Oil mist fine separator of crankcase
breather clogged
Replace (→ Page 43).
Exhaust turbocharger
Cylinder head
Piston rings
Cylinder liner
Faulty Contact Service.
MS150095/01E 2012-08 | Troubleshooting | 39
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