Fault handling
Fault Tracing
Symptoms and possible causes
Engine can’t be stopped. 1, 2, 3, 5,
Starter motor does not rotate or rotates slowly 1, 2, 3, 4, 5
Engine does not start. 6, 7, 8, 9, 28
Engine starts then stops 7, 8, 9, 13
Engine is difficult to start 7, 8, 9, 13
Engine does not reach correct speed at wide open
throttle (WOT)
7, 8, 9, 10, 11, 12, 13, 18
Engine knocks 14
Engine Runs Rough 7, 8, 9, 13, 14
Engine vibrates 18, 19
High fuel consumption 10, 11, 13, 15
Engine exhaust smoke is black 13, 15, 18
Engine exhaust smoke is blue or white 14, 15, 26
Oil pressure is too low 16, 17
Coolant temperature too high 20, 21, 22, 23, 24, 25, 26
No or poor charging 2, 27
1 Flat / poor batteries
2 Poor contact/open circuit in electrical wiring
3 Main switch turned off
4 Engine control not in neutral
5 Check fuses at engine.
6 Check fuel level
7 Blocked fuel filter/supply pump
8 Air in the fuel system.
9 Water in fuel indicator
10 Boat abnormally loaded
11 Fouled hull/propeller
12 Engine speed control wrongly adjusted
13 Insufficient air supply
14 Coolant temperature too high
15 Low coolant temperature
16 Oil level too low.
17 Blocked oil filter
18 Defective/wrong propeller
19 Faulty engine mounting
20 Coolant water level is too low
21 Air in fresh water system
22 Blocked seawater filter or sea water intake
23 Slipping or broken drive belt for circulation pump.
24 Worn or broken impeller in seawater pump
25 Defective thermostat
26 Oil level too high
27 Water in the fuel pre-filter
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