Piper PA-24 Comanche Service Manual page 332

PIPER COMANCHE SERVICE MANUAL
TABLE \'11-111.
TROVBLESHOOTI~G
CHART
(P";GI1I\E) (cont)
•
PO\\ER PL
2B24
ISSlED.8/18/72
Trouble
Cause
Remedy
High oil temperature.
Insufficient air cooling.
Check air inlet and outlet
deformation or obstruction.
Insufficient oil supply.
Fill oil sump to proper lev el.
Clogged oil lines or
Remove and clean oil screens,
screens.
Failing or failed bearing.
Examine sump for metal
particles and. if found.
overhaul engine.
Defective thermostats.
Replace.
Defective temperature gauge.
Replace gauge.
Excessive blow-by,
Usually caused by weak or
stuck rings. Overhaul.
Improper engine operation.
Check entire engine.
Excessive oil con-
Failing or failed bearing.
Check sump for metal particles
sumption.
and. if found. overhaul of
engine is indicated.
Worn or broken piston
Install new rings.
rings.
Incorrect installation of Install new rings.
piston rings.
•
External oil leakage.
Check engine carefully for
leaking gaskets. "0"
rings or sand holes.
Leakage through engine fuel
Replace fuel pump "0" ring.
pump vent.
Engine breather or vacuum
Check engine and overhaul or
pump breather. replace pump.
Inaccurate pressure Cold weather.
In extremely cold weather oil
readings.
pressure readings up to
100 pounds do not necessarily
indicate malfunctioning.
Overprirning.
Cold weather. Open throttle and unload engine.
Inaccurate pressure
Cold weather. High or low pressure readings
readings. due to extremelv cold weat her
are not necessarilv a mal-
function. Small and long oil
lines will not transfer pres-
sure readings accurately until
engine is quite warm.
1 ~.