MTU 16V4000C21 - Page 54

Engine speed not steady
Cause Corrective action
Injector defective u Replace (→ Page 96).
Speed transmitter defective u Contact Service.
Air in fuel system u Vent fuel system (→ Page 102).
DDEC defective u Contact Service.
Charge-air temperature too high
Cause Corrective action
Engine coolant treatment
incorrect
u Check (→ MTU test kit)
Intercooler contaminated 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 filter clogged u Check signal ring position of contamination indicator (→ Page 107).
Intercooler contaminated u Contact Service.
Exhaust turbocharger defective u Contact Service.
Coolant leaks at intercooler
Cause Corrective action
Intercooler leaky, major coolant
discharge
u Contact Service.
Exhaust gas black
Cause Corrective action
Air filter clogged u Check signal ring position of contamination indicator (→ Page 107).
Injector defective u Replace (→ Page 96).
Engine load too high u Contact Service.
Exhaust gas blue
Cause Corrective action
Too much engine oil in the engine u Drain engine oil (→ Page 110).
Filter element in oil separator is
clogged
u Replace (→ Page 81).
Exhaust turbocharger, cylinder
head, piston rings, cylinder liner
defective
u Contact Service.
54 | Troubleshooting | MS150049/04E 2017-04
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