Miscellaneous; Oil Pressure - Mercury MerCruiser D2.8L D-Tronic Service Manual

SERVICE MANUAL NUMBER 22

Miscellaneous

1. Hissing
2. Whistle
3. Squeaks or squeals

Oil Pressure

1. Measuring oil pressure
2. Check engine oil level with boat at rest
in the water
3. Oil level in crankcase above FULL
mark
4. Oil level in crankcase below ADD mark 4. Low oil pressure; oil pressure gauge
5. Change in oil pressure
90-860074--1 FEBRUARY 2002
Location
Item
Possible Causes
A. Leaking exhaust (manifolds or
pipes)
B. Loose cylinder heads
C. Blown head gasket
2. A. Vacuum leak
B. Dry or tight bearing in an
accessory
3. A. Drive belt slipping
B. Dry or tight bearing in an
accessory
C. Parts rubbing together
Special Information
1. Use a good automotive oil pressure
test gauge. Do not rely on the oil pressure
gauge in the boat.
2. Oil level should be between the ADD
and FULL marks
3. May cause loss of engine rpm, oil
pressure gauge fluctuation, drop in oil
pressure, and hydraulic valve lifter noise
at high rpm
fluctuation; internal engine noise and/or
damage
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.
TROUBLESHOOTING
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