Engine does not reach full-load speed
Component Probable Cause Task
Fuel supply Shut off Open shut-off valve before fuel prefilter
completely.
Fuel prefilter clogged Replace (→ Page 110).
Fuel filter clogged Replace (→ Page 104).
Air supply Air filter clogged Check signal ring position of service in‐
dicator (→ Page 115).
Fuel injection equip‐
ment
Injector defective Replace (→ Page 94).
Injection pump defective Replace (→ Page 91).
Engine wiring Defective Check (→ Page 145).
Vessel Overloaded Contact Service.
Exceeding weight Check vessel's loading condition;
Reduce load.
Vessel's trim position Trim vessel.
Marine growths on hull, propeller shaft,
propeller, rudder
Clean.
Rudder Rudder position Align rudder.
Propeller After propeller replacement: Propeller
is too big.
Replace.
Engine speed not steady
Component Probable Cause Task
Fuel injection equip‐
ment
Injector defective Replace (→ Page 94).
Injection pump defective Replace (→ Page 90).
Speed sensor Defective Contact Service.
Fuel system Not vented Vent fuel system (→ Page 102).
ECU Defective Contact Service.
Charge-air temperature too high
Component Probable Cause Task
Coolant Incorrect coolant concentration Check (MTU test kit).
Intercooler Contaminated Contact Service.
Engine room Air-intake temperature too high Check fans;
Check air supply / ventilation ducts.
Charge air pressure too low
Component Probable Cause Task
Air supply Air filter clogged Check signal ring position of service in‐
dicator (→ Page 115).
Intercooler Contaminated Contact Service.
Exhaust turbocharger Defective Contact Service.
68 | Troubleshooting | MW15407/14E 2012-02
TIM-ID: 0000002556 - 002
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