Piper Navajo PA-31 Service Manual page 521

TABLE VIII-II.
Trouble
High oil pressure. (cont.)
High oil temperature.
PIPER NAVAJO SERVICE MANUAL
TROUBLESHOOTING CHART (ENGINE) (cont.)
Cause
Remedy
Incorrect pressure relief
Replace with correct pressure
spring being used.
relief spring.
Relocating oil pressure take-
Use only the approved O.P.
off point on engine.
takeoff point on the engine.
Oil temperature too cold.
Allow oil temperature to
increase before increasing
throttle.
Insufficient air cooling.
Check air inlet and outlet for
deformation or obstruction.
Insufficient oil supply.
Fill oil sump to proper level
with specified oil.
Improper grade of oil.
Replace with oil conforming
to specifications.
Clogged oil lines, strainers,
Remove and clean oil strainers,
or cooler.
lines and cooler.
Excessive blow-by.
Usually caused by worn or
stuck rings.
Failing or failed bearings.
Examine sump for metal
particles. If found, overhaul
of engine is indicated.
Faulty thermostatic by-pass
Replace valve.
I
Excessive oil consumption.
valve.
Defective temperature gauge.
Excessive oil leaks.
Oil level too high.
Improper grade of oil.
Failing or failed bearings.
Replace gauge.
Inspect external portion of
engine for leaks; repair leaks.
Maintain oil at proper level.
Fill tank with oil conforming
to specifications.
Check sump for metal parti-
cles. Replace bearings if
necessary.
Revised: 9/24/81
POWER PLANT
2J23