TROUBLESHOOTING 87
11
COMPRESSION &
OIL SYSTEM
zz z Low compression
zz Carbon deposits in the combustion chamber
zz z Incorrect valve clearance
zzz
Low oil pressure/level, oil pump failure, Clogged oil filter
(Pressure switch ON)
zz Insufficient cooling water flow, clogged or defective pump
zz z
Incorrect valve timing (timing velt elongation or incorrect
installation)
zz z Intake/exhaust valve seal failure
zz Excessive wear of piston, piston ring or cylinder
zz Insuffcient tigtening of spark plug
OTHERS
zz Faulty thermostat
zz Cavitations or ventilation
zz Incorrect propeller selection
zz Damaged or bent propeller
z Improper thrust rod position
z Unbalanced load on boat
zz Transom too high or too low
z A great deal of air is contained inside pump
z Insufficient throttle aperture
Difficult to start engine
Engine runs erratically
Low engine speed/
Poor boat speed
Battery will not hold charge
Starter motor will not crank
Power T inoperative
Warning lamp “ON”
Warning buzzer “ON”
Possible cause
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