Engine does not reach rated speed
Component
Cause
Measure
Fuel supply
Fuel inlet blocked
Completely open shutoff valve up‐
stream of fuel prefilter.
Fuel prefilter clogged
Replace (→ Page 117).
Easy-change fuel filter contaminated
Replace (→ Page 110).
Air supply
Air filter clogged
Check signal ring position of contami‐
nation indicator (→ Page 121).
Fuel injection equip‐
ment
Injector faulty
Replace (→ Page 102).
Injection pump defective
Replace (→ Page 98).
Engine wiring
Faulty
Check (→ Page 144).
Engine
Overloaded
Contact Service.
Engine speed not steady
Component
Cause
Measure
Fuel injection equip‐
ment
Injector faulty
Replace (→ Page 102).
Injection pump defective
Replace (→ Page 98).
Speed sensor
Faulty
Contact Service.
Fuel system
Air in fuel system
Vent fuel system (→ Page 109).
Engine governor
Faulty
Contact Service.
Charge-air temperature too high
Component
Cause
Measure
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
Measure
Air supply
Air filter clogged
Check signal ring position of contami‐
nation indicator (→ Page 121).
Intercooler
Contaminated
Contact Service.
Exhaust turbocharger Faulty
Contact Service.
Coolant leaks at intercooler
Component
Cause
Measure
Intercooler
Leaking, major coolant discharge
Contact Service.
62 | Troubleshooting | MS150025/02E 2012-10
TIM-ID: 0000002536 - 002
