Engine/Carburetor Troubleshooting - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
TABLE VlIA-IU. TROUBLESHoanNGCHA1lT
(ENGINE) (CAUURETOR)
Trouble
Caauc RCIMdy
Failure of ename to
Lack
of fuel.
Check fuel system for leaks.
start.
FiU fuel tank.
Clan dirty lines. strainers.
or fuel cocks.
Undupriminl·
. Prime with two or three
strOkes of primer.
Overpriminl·
Open throttle a.nd "unload"
enpne.
Incorrect throttle
scttiJ1I.
Open throttle to one-tenth of
its rep.
Defective spark plup. ClCUl and adjUSt or replace
spark plu, or plup. Refer
to Paragraph 7A-81 for
spark plug ,ap adjusanents.
Defective ignition wire.
Check with electric: tester and
replace any defective wires.
Improper operation of
Check iDtcma.l
cimini
of
mapeto to breaker
poinu mapeto. Check points.
Mapctizcd impulse couplint
Dcmapctize impulse couplings.
left mapeto only.
Froze spark plul electrodes.
Replace spark plugs or dry out
removed plur.
Mixture control in ictle cut-
Opcn mixture control.
off.
Internal failure.
Check oil sump screen for metal
particles. If found. complete
overhaul of the engine may be
indicated.
rs-zoo
ma,netOS
only) Broken contact: SPrint.
Replace capacitor.
I
Improper switch wirinl for
Reverse mlflleto switch wires.
left mapeto swtin•.
Shorted ilnition switch or
Check and replace or repau.
loose ground.
POWER PLANT
ISSUED: 8/18172
2
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