MTU 12 V 2000 G25 Operating Instructions Manual page 65

Engine speed not steady
Component Probable Cause
Fuel injection equip- Injector defective
ment
Injection pump defective
Speed sensor Defective
Fuel system Not vented
Engine Governor Defective
Charge-air temperature too high
Component Probable Cause
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
Injection pump defective
Engine Overloaded
Exhaust gas blue
Component Probable Cause
Engine oil Too much oil in engine
Oil separator of crankcase breather con-
taminated
Exhaust turbocharger, Defective
cylinder head, piston
rings, cylinder liner
Task
Replace (→ Page 85).
Replace (→ Page 82).
Contact Service.
Vent fuel system (→ Page 94).
Contact Service.
Task
Check (MTU test kit).
Contact Service.
Check fans and air supply / ventilation
ducts.
Task
Check signal ring position of service in-
dicator (→ Page 107).
Contact Service.
Contact Service.
Task
Contact Service.
Task
Check signal ring position of service in-
dicator (→ Page 107).
Replace (→ Page 85).
Replace (→ Page 82).
Contact Service.
Task
Drain engine oil (→ Page 110).
Replace (→ Page 74).
Contact Service.
MS15018/02E 2013-09 | Troubleshooting | 65