Piper PA-24 Comanche Service Manual page 423

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PIPER COMANCHE SERVICE MANUAL
the cimini is eerreet. both timinl LiJhts will be out. If the breakCT points open too soon, loosen the
mqneto mounting nua, aad roate the m2pleto in a clockwise direction (right ma,ntto). The left
"I~rr.eto
should also be routed in a clockwise liirection. If points open too late. 'tum both mqnetos
in
a
counterclockwise direction. When it is eena.iJI both mqrlctos
arc
set
to
rue
tOJemer, remove timing LiJht
&nd replace plugs.
CAUTION
Whm
timinlretard
breaker mapetos
to
the enpc. only main breaker
poina
are
timed.
Never
attempt to time rewd breaker poina to the
etlJine.
i8-43. Hamcu Assembly.
7844.
Inspection
Of
Hamcu.
a. Check lead assemblies for nicks,
CUtl,
mutilated bnidifttJ, badly wom section or &ny other evidence
of physical damage. Inspect spark plug sleeves for chafing or tean and damaged or stripped threads on
couplinJ nuts. Check compression sprina
to
sec if it is broken or distorted. Inspect grommet for tean.
Cheek all mounting brac:kcu and clamps to see that they ate secure and not cracked.
b. Using an ohmmeter, buzzer. or other suitable low voltage device, check
e~h
lead for continuity. If
continuity does not exist, wire
is
brakeD and must be replaced.
c. Minor
repair
of the harness assembly. such as replacement of conact springs. spring retainer
assemblies, insulating sleeves or of one lead assembly, an be accomplished with the harness assembiy
mounted on the engine. However. should repair require replacement of mote than one lead asscmbly or of a
cable outlet ?late, the harness should be removed from the enline and sent to an overhaul shop.
7B45. Removal Of HIlDCSI.
a. DiscoMect the clamps that
SCCUtc
the wires to the e"line and accessories.
b. Loosen the coupling nuts at the spark plugs and remove the insulatOrs from the spark ?lug barrel
well. Usc caution whm withdtawi"l the insulator not to d.a.mlle the insulator spring.
c. Place
Ii
guard oyer the harness insulators.
d. Remove the harness assembly tcnninal plate from the magneto.
e. Remove the eqine baffle plate that receives the harness usembl)'.
f.
Remove the harness from the airplane.
7B46. Installation Of Harness. Before installing harness on lna§neto. check mating surfaces for cleanliness.
Spray entire face of grommet with a tilht coat of Plastic Mold Spray. SM.Q.Q·TH Silicone Spray or
equivalent. This will prevent harness grommet from sticking to magneto distributor block.
a. Place the harness temunal plate onthe magneto and tighten nuts around the plate alternarelv to
scat cover squarely on magneto. Torque screws to 18 to 12 inch pounds.
b. Route ignition wires to their respective
cylinders,
c. Clamp the harness assembly in position and replace the engine baffle ?late.
d. Connect the leads to the spark plugs.
POWER PLANT
ISSUED: 8/18/72
2
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