MTU 12 V 2000 M72 Operating Instructions Manual page 62

Engine speed not steady
Component
Fuel injection equip‐
ment
Speed sensor
Fuel system
ECU
Charge-air temperature too high
Component
Engine coolant
Intercooler
Engine room
Charge air pressure too low
Component
Air supply
Intercooler
Exhaust turbocharger Defective
Coolant leaks on intercooler
Component
Intercooler
Exhaust gas black
Component
Air supply
Fuel injection equip‐
ment
Engine
Exhaust gas blue
Component
Engine oil
Exhaust turbocharg‐
er, cylinder head, pis‐
ton rings, cylinder lin‐
er
62 | Troubleshooting | M015650/03E 2011-10
Probable Cause
Injector defective
Defective
Not vented
Defective
Probable Cause
Incorrect coolant concentration
Contaminated
Air-intake temperature too high
Probable Cause
Air filter clogged
Contaminated
Probable Cause
Leaking, major coolant discharge
Probable Cause
Air filter clogged
Injector defective
Overloaded
Probable Cause
Too much oil in engine
Oil separator or oil preseparator of
crankcase breather clogged
Defective
Task
Replace (→ Page 85).
Replace.
Vent fuel system (→ Page 88).
Contact Service.
Task
Check.
Contact Service.
Check fans and air supply / ventilation
ducts.
Task
Check signal ring position of service in‐
dicator (→ Page 100).
Contact Service.
Contact Service.
Task
Contact Service.
Task
Check signal ring position of service in‐
dicator (→ Page 100).
Replace (→ Page 85).
Contact Service.
Task
Drain engine oil (→ Page 103).
• Clean preseparator (→ Page 78).
• Replace filter element of oil separa‐
tor (→ Page 79).
Contact Service.