Engine does not reach full load speed
Cause Corrective action
Fuel supply blocked. u Completely open shutoff valve upstream of fuel prefilter.
Fuel prefilter clogged. u Replace filter element (→ Page 179).
Easy-change fuel filter clogged. u Replace (→ Page 173).
Air filter clogged. u Check signal ring position of contamination indicator
(→ Page 184).
Injector faulty. u Replace (→ Page 163).
Injection pump faulty. u Replace (→ Page 160).
Engine wiring faulty. u Check (→ Page 214).
Overload. u Contact Service.
Vessel too heavy. u Check load.
Reduce load.
Trim position incorrect. u Trim vessel.
Marine growth on hull, propeller
shaft, propeller, rudder.
u Clean components.
Rudder position incorrect. u Align rudder.
Propeller too big after
replacement.
u Install suitable propeller.
Engine speed not steady
Cause Corrective action
Injector faulty. u Replace (→ Page 163).
Injection pump faulty. u Replace (→ Page 159).
Speed sensor is faulty. u Contact Service.
Air in fuel system. u Vent fuel system (→ Page 171).
Engine control unit ECU is
defective.
u Contact Service.
Charge-air temperature too high
Cause Corrective action
Incorrect engine coolant
concentration.
u Check (MTU test kit).
Charge-air cooler is
contaminated.
u Contact Service.
Air inlet temperature in engine
room is too high.
u Check fan
Check air inlet/outlet ducts.
Charge-air pressure too low
Cause Corrective action
Air filter clogged. u Check signal ring position of contamination indicator
(→ Page 184).
Charge-air cooler is
contaminated.
u Contact Service.
Exhaust turbocharger faulty. u Contact Service.
MW15406/17E 2014-05 | Troubleshooting | 131
TIM-ID: 0000042073 - 001
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