Engine does not reach nominal speed
Cause
Corrective action
Fuel prefilter (not switchable)
clogged
u
Fuel prefilter (switchable) clogged.
u
Fuel filter clogged
u
Air filter clogged
u
Check signal ring position of service indicator (→ Page 149).
Injector defective
u
Engine wiring faulty
u
Engine: Overload
u
Contact Service.
Engine speed not steady
Cause
Corrective action
Injector defective
u
Speed transmitter defective
u
Contact Service.
Air in fuel system
u
Vent fuel system (→ Page 123).
Engine governor defective
u
Contact Service.
Charge-air temperature too high
Cause
Corrective action
Engine coolant treatment
incorrect
u
Check (→ MTU test kit).
Intercooler dirty
u
Contact Service.
Engine room: Air-intake
temperature too high
u
Check fans and intake/exhaust lines.
Charge-air pressure too low
Cause
Corrective action
Air pipework leaking
u
Check air pipework for leakage.
Air filter clogged
u
Check signal ring position of service indicator (→ Page 149).
Intercooler dirty
u
Contact Service.
Exhaust turbocharger defective
u
Contact Service.
Coolant discharge at intercooler
Cause
Corrective action
Leaking, major coolant discharge
u
Contact Service.
Black exhaust gas
Cause
Corrective action
Air filter clogged
u
Check signal ring position of service indicator (→ Page 149).
Injector defective
u
Engine: Overload
u
Contact Service.
62 | Troubleshooting | MS15058/04E 2018-12
TIM-ID: 0000074300 - 001
Summary of Contents for 20V4000G44F
Page 4: ......