Piper PA-24 Comanche Service Manual page 431

•
•
•
P1P':R COMANCHE SERVICE MANUAL
TABLE VllB1J, TJlOUBLESHOOTING r.HAJtT
(ENGINE) (coat)
Trouble
Cau.
Remedy
Failure of engine to Incorrect idle adjusmaent Aaj\lSt throttle itoI' to obtain
idle' properly. comet idle.
Insufficient fuel pressure. Check fuel strainer and pump
pressure adj\&$unent.
Clogcd injector nodes, Remove and flush with acetone.
810w throulh orifice with
compressed. air' 100 psi.
Leak in induction system. rithten all connections in
the induction system. Re-
place any defective partS.
Low cylinder compression. ClMck condition of piston
rinp
and valve seaa.
Faulty iptition system. Check entire ipition system.
Low power and uneven Mixture tOO rich; indicated
lnjeaor may need recall-
runnint·
by slugish CftIine opu- bration by authorized
adon, red exha\I.R flame pctSOnnei.
It ni,ht, Exacme cases
indicated by blac:k smoke
from exhaust.
."lixture tOO lean; indicated Check fuel supply. Check
by ovcrbeatinJ or back-
fuel lines for obstnlccio ns
firing.
or nmrietions.
Leaky nozzle.
Remove nozzle and blow
intO
it. Air escapin, through
the nozzle valve indicates
leakin,. Replace nozzle.
Cloacd injector nozzles.
Remove and flush with acetone.
Blow through orifice with
compmsed
lit·
100 psi.
Din
in inlcr screen. Remove screen and flush with
acetone. Blow with
compressed air.
Dirt in "T"
fittinJ.
Remove "T" fittin,lt distri-
buter. clean in acetone.
Blow throu,h orifice with
compressed ait ' 100 psi.
Fuel supply pressure
Check fuel pump pressure.
excessively hiJh.
POWER PLANT
ISSUED: 8/18/72
2
63