Fault tracing
A number of symptoms and possible reasons for engine problems are described in the table below. In case of
faults or mishaps which you cannot solve, always contact the Volvo Penta dealership.
In the event of engine interference related to the GAC governor (Generating set engines), refer to the
documentation delivered with the GAC governor.
WARNING! Read the safety precautions for maintenance and service in the chapter: "Safety Information", be-
fore starting work.
Symptoms and possible causes
Starter motor not turning (or turning slowly)
Engine will not start
Engine starts but stops again
Engine difficult to start
Engine does not reach correct speed at wide open throttle (WOT)
Engine knocks
Engine runs unevenly
Engine vibrates
High fuel consumption
Black exhaust smoke
Blue or white exhaust smoke
Low oil pressure
Engine coolant temperature too high
No or poor charging
1. Discharged battery
2. Loose connection / open-circuit
3. Fuse tripped
4. Lack of fuel
5. Fouled fuel filter.
6. Air in the fuel injection system
7. Water / contaminants in the fuel
8. Insufficient air supply
9. Engine coolant temperature too
high
10. Engine coolant temperature is too
low
11. Lubricating oil level too low.
12. Blocked fuel filter
13. Defective engine mounting
14. Worn clutch
15. Too little coolant
16. Radiator blocked
17. Circulation pump defective
18. Defective / incorrect thermostat
19. Lubricating oil level too high
20. Generator drive belt slipping
21. Defective ignition switch / starter
button
22. Defective start relay
1, 2, 3, 21, 22, 23, 24
4, 5, 6, 7, 25, 26, 31
4, 6, 7, 8, 25, 26
4, 5, 6, 7, 25, 26, 31
4, 5, 6, 7, 8, 9, 29, 30, 31
4, 5, 6, 7
4, 5, 6, 7, 8, 9, 31
13, 14
8, 10
8, 28
10, 19, 28
11, 12
15, 16, 17, 18, 27, 28
2, 20
23. Defective starter motor / solenoid
24. Water in the engine
25. Preheating insufficient
26. Starter element defective / not con-
nected
27. Defective temperature gauge / sen-
sor
28. Faulty injection timing
29. Engine overloaded
30. Excessive back pressure in exhaust
system
31. Fault in the GAC unit (generating
set engines)
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