Piper Comanche PA-24 Service Manual page 549

PIPER COMANCHE SERVICE MANUAL
the timing is cornet, both
timinI
llg/Its will be out. If the breaker poiDts open '00 IOOD, loosen 'he
mapetO mounting nuts, and roa. .. the mape,o iD a <loc:kwise directioD
(riIb'
mapeto). The left mape,o
should also be rou,ed iD a clockwix olireotion. If points open
'00
Ia,e, •
tum
both mapeto. in a
countercloclcwiK cliteotiOD. When i, is c:eruiD both magneto. an:
let
to
rift
,.,..mer, remove timinlligh,
and replaoe PIU,..
CAUTION
When
timinJ
mard breaker mll"eros
'0
the engine, only maiD breaker
poiDts "" timed. Never manp'
to
time mard breaker poiDts
'0
the
eneine.
71-43. Hamal AJoembly.
71-14. l!llpCcUoD Of Hamcu,
a,
Check lead uscmblies for niclcs, <uts, mutila,ed braiclini, badly worn .... ion or any other evidence
of physical damage. lasp ... spark plug .Ieev .. for chafing or
tears
and damaged or .tripped thread. on
coupling nuts. Checlc compression spring
to ..
e if i,
is
brokeD or dis,orted. Inspe .. gromme, for ,ears.
Check all mounting brackets and clamps
to ...
that they are .. cure and no, cracked.
b. Using an
ohmmerer, buzzer, or other Nitable low VOltage devie<, checlc each lead for continuity If
continuity does not exist. wire
is broken and must be replaced.
c.
MiDor repair of the harness .... mbly, Ncb as replaeemen, of concact sprinp, .pring retainer
.... mbli .. , in.ula'ing
sleeves
or of one lead .... mbly,
can
be accompliahed with the harness .... mbiy
mounted on the engine. HoweveT. should repair require replacement of more than onc lead assembly or of a
cable outlet ?Iate, 'he ham ... should be removed from the engine and .. n'
'0
an overhaul .hop
7845. Removal Of Ham ... ,
a.. Disconnect the clamps cha.e seaate the wires to the engine and accessories.
b. Loosen the coupling nuts at the spark plugs and remove the irlsulaton from the spark plug barrel
well. Use caution when withdrawing the insulator not to damq:e the insulator spring.
c. Place a guard oyer the harness inJulaton.
d.. Remove the harness assembly tenninal place from the magneto.
e. Remove che engIne baffle plate that receiYes the harness assembly.
f. Remove the h.arness from the airplane.
7B46. InJaUadon Of Harness. Before installing harness on l'T1.I.!l1eto. check maring surfaces for cleanliness.
Spray entire face of grommet with a light coat of Plastic .\told Spray. SM.Q.Q-TH Silicone Spray or
equi\·alent. This Will prevent harness grommet from sticking to magneto distributor block.
a. Ptace the harness termUlal plate on the magneto and tighten nuts around the plate :llternately to
scat cover squarely on magneto. Torque sc:rews to 18 to 22 inch pounds.
b Route ignition wires to their respective
~ylindcn.
c. Clamp the harness assembly in position and replace the engIne baffle plate.
d. Connect 'he leads to the spark plugs.
POWER PLANT
ISSUED: 8/18172
2 F19