Piper Navajo Chieftain PA-31-350 Service Manual page 505

NAVAJO CHIEFTAIN SERVICE MANUAL
TABLE VIII-IV. TROUBLESHOOTING CHART (ENGINE) (cont)
Trouble
Cause
Remedy
High oil temperature.
Insufficient air cooling.
Check air inlet and outlet
for deformation or ob-
struction.
Insufficient oil supply.
Fill oil sump to proper
level with specified oil.
Low grade of oil.
Replace with oil conforming
to specifications.
Clogged oil lines or
Remove and clean oil
strainers.
strainers.
Excessive blow-by.
Usually caused by worn or
stuck rings.
Failing or failed
Examine sump for metal
bearings.
particles. If found, over-
haul of engine is indicated.
Defective temperature
Replace gauge.
Excessive oil consumption.
gauge.
Low grade of oil.
Failing or failed
bearings.
Worn piston rings.
Incorrect installation
of piston rings.
Failure of rings to seat.
(New nitrided cylinders.)
Fill tank with oil conform-
ing to specifications.
Check sump for metal
particles.
Install new rings.
Install new rings.
Use mineral base oil. Climb
to cruise altitude at full
power and operate at 75%
cruise power setting until
oil consumption stabilizes.
Reissued: 9/23/80
POWER PLANT
2J18