Piper PA-24 Comanche Service Manual page 391

•
•
•
PIPER COMANCHE SERVICE MANUAL
TABU VIlA-IB.
TROUBLESHOOTING
CHART
(ENGINE) (CAUIJR.E'TOR)
(coat)
Trouble CauIC
Remedy
HiJh oil cempcraC\lre.
Insuff'icicut air cooliq.
Check
air
inlet and
oudet defomation or
ObsauetiOD.
Insufficient oil supply. F ill oil sump to proper
ind.
Cloged oillina or Remove and clean oil
screens.
screens.
Failint or failed beariDl. Examine sump for metal
particles and. if found.
overhaul enJine.
Defective thmnostus.
Replace.
Defective
CClftpeTatutC . . .
Replace , • .
Excessive blow-tty.
Usually caused by weak or
stuck
rinp.
Overhaul.
Improper enpIe operation.
Check entire engine.
Excnsive oil con-
F
ailinJ
or failed beariftl. Check sump for metal par-
sumptlon.
tides aDd. if found.
overhaul of engine is
indicated.
Worn or broken piston
rings.
Install new finis.
Incorrect installation of InsWl new rings.
piscon rings.
External oilleakace.
Check engine carefully for
leaking
,wen.
"0"
rings or SUld holes.
Leuqe throUJh engine
Replace fuel pump "0"
fuel pump vent. ring.
Engine breather or vacuum
Check entine and overhaul
pump breather.
or replace pump.
(naccurate pressure
Cold weather.
In extremely cold weather
readings.
oil pressure readings up
to 100 pounds do not
necessarily indicate
malfunctioning.
Overpriming.
Cold weather.
Open thrortle and unlo~d
engine.
POWER PLANT
ISSUED: 8/18/72
2 Ell