MTU 12 V 2000 M92 Operating Instructions Manual page 55

Engine speed not steady
Component Probable Cause
Fuel injection equip‐ Injector defective
ment
Speed sensor Defective
Fuel system Not vented
ECU Defective
Charge-air temperature too high
Component Probable Cause
Engine coolant Incorrect coolant concentration
Intercooler Contaminated
Engine room Air-intake temperature too high
Charge air pressure too low
Component Probable Cause
Air supply Air filter clogged
Intercooler Contaminated
Exhaust turbocharger Defective
Coolant leaks on intercooler
Component Probable Cause
Intercooler Leaking, major coolant discharge
Exhaust gas black
Component Probable Cause
Air supply Air filter clogged
Fuel injection equip‐ Injector defective
ment
Engine Overloaded
Exhaust gas blue
Component Probable Cause
Engine oil Too much oil in engine
Oil separator or oil preseparator of
crankcase breather clogged
Exhaust turbocharg‐ Defective
er, cylinder head, pis‐
ton rings, cylinder lin‐
er
Task
Replace (→ Page 77).
Replace.
Vent fuel system (→ Page 80).
Contact Service.
Task
Check.
Contact Service.
Check fans and air supply / ventilation
ducts.
Task
Check signal ring position of service in‐
dicator (→ Page 92).
Contact Service.
Contact Service.
Task
Contact Service.
Task
Check signal ring position of service in‐
dicator (→ Page 92).
Replace (→ Page 77).
Contact Service.
Task
Drain engine oil (→ Page 95).
• Clean preseparator (→ Page 70).
• Replace filter element of oil separa‐
tor (→ Page 71).
Contact Service.
M015700/06E 2012-06 | Troubleshooting | 55