Piper Comanche PA-24 Service Manual page 450

PIPER COMANCHE SERVICE MANUAL
TABLE VII-III TROUBLESHOOTING CHART
(
ENGINE ) (cont)
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 le\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
I mproper 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.
Overpriming. Cold weather.
Open throttle and unload engine.
Inaccurate pressure Cold weather. High or low pressure readings
readings. due to extremely cold weather
are not necessarilv a mal-
function. Small and long oil
lines will not transfer pres-
sure readings accurately until
engine is quite warm.
ISSUED: 8/18/72
2B24
POWER PL_