Mercury MerCruiser D2.8L D-Tronic Service Manual page 657

SERVICE MANUAL NUMBER 22
Troubleshooting Charts (Continued)
CONDITION
LUBRICATING
OIL PRESSURE
TOO HIGH
LUBRICATING
OIL LOSS
90-860074--1 FEBRUARY 2002
POSSIBLE CAUSES
1. Pressure switch/gauge not
operating properly.
2. Engine operating too cold.
3. Oil viscosity too thick.
4. Oil pressure relief valve stuck
closed or binding.
1. External leaks.
2. Crankcase being overfilled.
3. Incorrect oil specification or
viscosity.
4. Oil Cooler leak.
5. High blow-by forcing oil out
the breather.
6. Turbocharger leaking oil to
the air intake.
7. Piston rings not sealing (oil
being consumed by the
engine).
EDI DIAGNOSIS
CORRECTION
1. Verify the pressure switch is
functioning correctly. If not,
replace switch/gauge.
2. Refer to
Temperature Below Normal."
3. Make sure the Correct oil
being used, (Refer to Group,
Lubrication
Maintenance).
4. Check and replace valve.
1. Visually inspect for oil leaks.
Repair as required.
2. Verify that the correct
dipstick and/or correctly
marked dipstick is being
used.
3. (A) Make sure the correct oil
is being used.
(B) Look for reduced
viscosity from dilution with
fuel.
(C) Review/reduce the oil
change intervals.
4. Check and replace the oil
cooler.
5. Check the breather tube area
for signs of oil loss. Perform
the required repairs.
6. Inspect intercooler for
evidence of oil transfer
Repair as required.
7. Perform compression check.
Repair as required.
"Coolant
and
Page 5E-89