TROUBLESHOOTING
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 1C-23
Miscellaneous
Location Possible Causes
1. Hissing A. Leaking exhaust (manifolds or
pipes)
B. Loose cylinder heads
C. Blown head gasket
2. Whistle 2. A. Vacuum leak
B. Dry or tight bearing in an
accessory
3. Squeaks or squeals 3. A. Drive belt slipping
B. Dry or tight bearing in an
accessory
C. Parts rubbing together
Oil Pressure
Item Special Information
1. Measuring oil pressure 1. Use a good automotive oil pressure
test gauge. Do not rely on the oil pressure
gauge in the boat.
2. Check engine oil level with boat at rest
in the water
2. Oil level should be between the ADD
and FULL marks
3. Oil level in crankcase above FULL
mark
3. May cause loss of engine rpm, oil
pressure gauge fluctuation, drop in oil
pressure, and hydraulic valve lifter noise
at high rpm
4. Oil level in crankcase below ADD mark 4. Low oil pressure; oil pressure gauge
fluctuation; internal engine noise and/or
damage
5. Change in oil pressure 5. This may be a normal condition. Oil
pressure may read high in the cooler times
of the day, and when engine is not up to
operating temperature. As the air
temperature warms up and engine is
running at normal opening temperature, it
is normal for oil pressure to drop.
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