Piper COMANCHE PA-24-180 Service Manual page 425

PIPER COMANCHE SERVICE MANUAL
the timing is correct, both timing lights will be out If the breaker points open too soon, loosn the
magneto mounting nus. and rotate the magneto in a clockwise direction (right magneto). The left mgnero
should lso be routed in a clockwise direction. If points open too late, rum both magnetos in a
counterlockwise direction. When it is cerain both magnetos are set to fuie together. remove timing light
and replace plugs.
CAUTION
When timing reurd breaker magnetos to the engine, only main breaker
point are timed. Never atempt ro ime reard breaker points to the
engine.
7-43. Harnes Assembly.
78-44. Inpection Of Haness.
a.
Check lead assemblies for nicks, cuts, murilated braiding, badly worn section or any other evidence
of physical damage. Inspect spark plug sleeves for chafing or tears and damaged or stipped threads on
coupling nun. Check compression spring o see if it is broken or distorted. Inspect grommet for rears.
Check all mounting brackets and clamps to ee that they are secure and not cracked.
b. Using an ohmmeter, buzzer, or other suitable low voltage device, check each lead for continuiy If
continuity does not exist, wire is broken and must be replaced.
c. Minor repair of the harness assembly, such as replacement of concat springs, spring retainer
assemblies, insulating sleeves or of one lead assembly, can be accomplished with the harness assembiv
mounted on the engine. However. should repair require replacement of more than one lead asembly or of a
cable oudle plate, the harness should be removed from the engine and sent to an overhaul shop
7B145. Removal Of Haness.
a.
Disconnect the clamps thar secure the wires to the engine and accessories.
b. Loosen the coupling nuts at the spark plugs and remove the insulaton from the spark plug barrel
well. Use caution when withdrawing the insulator not to damage the insulator spring.
c.
Place a guard over the harness insulaton.
d. Remove the harness assembly erminal place from the magneto.
e. Remove the engine baffle plate that receives the harness assembly.
f.
Remove the harness from the arplane.
7816. Installation Of Harness. Before installing harness on magneto. check mating surfaces for cleanliness.
Spray entire face of grommer with a light coat of Plastic Mold Spray, SM--0-TH Silicone Spray or
equivalenr. This will prevent harness grommet from sticking to magneto distribuor block.
a.
Place the harness rerminal place on the magneto and tighten nuts around the place alternately to
scat cover squarely on magneto. Torque screws to 18 to 22 inch pounds.
b
Route ignition wires to their respective cylinders.
c. Clamp the harness assembly in position and replace the engine baffle plate.
d. Connect the leads to the spark plugs.
POWER PLANT
ISSUED: 8/18/72
2 F19