52
TROUBLESHOOTING
11
Engine falling to start
Engine starting but stopping soon
Poor idling
Poor acceleration
Engine speed abnormally high
Engine speed abnormally low
Boat speed low
Overheating of engine
Warning lamp ON
Possible cause
COMPRESSION
& OIL SYSTEM
● ● ● ● ●
Low compression
● ●
Carbon deposits in the combustion chamber
● ●
Incorrect valve clearance
●
Low oil pressure/level
ENGINE OIL SYSTEM
● ● ●
Low oil level
● ●
Use of improper oil
● ● ●
Oil deterioration
● ● ●
Clogged oil strainer
● ● ●
Faulty oil pump
OTHERS
● ● ● ● ●
Incorrect adjustment of throttle link
● ●
Insufficient cooling water flow, clogged or defective pump
● ● ●
Faulty thermostat
● ● ● ●
Cavitation or ventilation
● ● ● ● ●
Incorrect propeller selection
● ● ● ● ● ●
Damaged or bent propeller
● ● ● ●
Improper thrust rod position
● ● ● ● ●
Unbalanced load on boat
● ● ● ● ●
Transom too high or too low
OM_E_4HP_body_111213.indd 52 11/12/13 13:21
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