Piper COMANCHE PA-24-180 Service Manual page 393

Excessive oil con-
PIPER COMANCHE SERVICE MANUAL
TABLE VItA4n. TROUBLESHOOTING CHART
(ENGINE) (CARBURETOR) (coat)
Clue
Trouble
Remedy
High oil empenrure.
Insuffcient ir cooling.
lnsufficient oil supply.
Clogged oil lines or
screens.
Failing or failed bearng.
Defective thermostas.
Defective temperature gage.
Excesive blow-by.
Improper engme operation.
Check air inlet and
ouder deformation or
obstruction.
Fill oil sump to proper
level.
Remove and clean oil
screens.
Examine sump for metal
paricles and, if found,
overhaul engine.
Replace.
Replace gage.
Usually caused by weak or
stuck rings. Overhaul.
Check entire engine.
Failing or failed bearing.
Worn or broken piston rings.
Incorrect ustallaion of
puiston rings.
External oil lekage.
Leakage through engine
fuel pump vent.
Engine breather or vacuum
pump breather.
Check sump for metal par-
tides and, if found,
overhaul of engine is
indicated.
Install new rings.
Install new rings.
Check engine carefully for
leaing gaskers, "0"
rings or sand holes.
Replace fuel pump "O"
nng.
Check engine and overhaul
or replace pump.
Inaccurute pressure
readings.
Cold weather In extremely cold weather
oil pressure readings up
to 100 pounds do nor
necessu ly indicate
malfunctoning.
Overpnming.
Cold weather. Open thrortle and unload
engine.
POWER PLANT
ISSUED: 8/18/72
2 Ell