MTU 12V 2000 C66 Operating Instructions Manual page 39

Engine speed not steady
Component Cause
Fuel injection equip‐ Injector faulty
ment
Speed sensor Faulty
Fuel system Air in fuel system, if fault occurs after
filling the system.
Engine governor Faulty
Charge-air temperature too high
Component Cause
Engine coolant Engine coolant treatment incorrect
Intercooler Contaminated
Engine room Air-intake temperature too high
Charge-air pressure too low
Component Cause
Air supply Air filter clogged
Intercooler Contaminated
Exhaust turbocharger Faulty
Coolant leaks at intercooler
Component Cause
Intercooler Leaking, major coolant discharge
Black exhaust gas
Component Cause
Air supply Air filter clogged
Fuel injection equip‐ Injector faulty
ment
Engine Overloaded
Blue exhaust gas
Component Cause
Engine oil Too much oil in engine
Oil mist fine separator of crankcase
breather clogged
Exhaust turbocharger Faulty
Cylinder head
Piston rings
Cylinder liner
Action
Replace (→ Page 48).
Contact Service.
Vent fuel system (→ Page 56).
Contact Service.
Action
Check (MTU test kit).
Contact Service.
Check fan;
check air inlet/outlet ducts.
Action
Replace air filter (see manufacturer's
documentation).
Contact Service.
Contact Service.
Action
Contact Service.
Action
Replace air filter (see manufacturer's
documentation).
Replace (→ Page 48).
Contact Service.
Action
Drain engine oil (→ Page 70).
Replace (→ Page 43).
Contact Service.
MS150094/01E 2012-08 | Troubleshooting | 39