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

SERVICE MANUAL NUMBER 22

Low Oil Pressure

1. Low oil level in crankcase
2. Defective oil pressure gauge and/or
sender
3. Thin or diluted oil
4. Oil pump
5. Oil leak can be internal or external
6. Excessive bearing clearance

High Oil Pressure

IMPORTANT: Oil pressure slightly higher than normal does not always indicate a
problem. Oil viscosity, and weather conditions could cause high oil pressure.
1. Oil too thick
2. Defective oil pressure gauge and/or
sender
3. Clogged or restricted oil passage
4. Oil pump relief valve stuck closed
90-860074--1 FEBRUARY 2002
Cause
Cause
Special Information
2. Verify with an automotive test gauge.
3. Oil broken down; contains water or
fuel; wrong viscosity; engine running too
hot or too cold; excessive idling in cold
water (condensation)
4. Relief valve stuck open; pickup tube
restricted; worn parts in oil pump; air leak
on suction side of oil pump or pickup oil
tube
5. Oil passage plugs leaking, cracked or
porous cylinder block
6. Cam bearings, main bearings, rod
bearings
Special Information
1. Wrong viscosity, oil full of sludge or tar
2. Verify with an automotive test gauge
TROUBLESHOOTING
Page 1C-25