Piper PA-24 Comanche Service Manual page 316

PIPER CO\1ASCHE SERVICE MASl:AL
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9
1 CONTACT SPRING
2 RETAINING SPRING
3
DISTRIBUTOR BLOCK
4
BREAKER COMPARTMENT
5
LEAD WIRE
6 CAPACITOR
7 BREAKER ASSEMBLY
8 BREAKER CAM
9 IMPULSE COUPLING
10 FLYWEIGHTS
FIGl'RE 7·8, MAGNETO INSPECTION
11. RIVETS
12 LEAD CIRCUIT
13 CONTACT SPRING
14 INSULATOR
15 VENT PLUG
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i.
Inspect impulse coupling 121 magneto) flyweights for excessive looseness of the axles. Design
couplings having .917 inch thick body should be checked with I 8 inch drill. Couplings \\ ith .974 inch
thick body are checked" ith a \0. I R drill. If drill fits between cam and flyweight the fit is too loose and
coupling should be replaced. (Refer to Figure 7-10.)
j.
Check impulse coupling for excess wear on the contact edges of body and flyweights.
k. Check that the impulse coupling flyweight axle rivets are tight and there are no cracks in body.
I.
Check lead conduits for frayed or broken areas of braid due to excessive wear and replace where
deemed necessary.
m. Check the springs for breaks. corrosion, or deformation. If possible. check continuity from block
with tester or light.
n. Check insulators for cracks. breaks or deterioration due to age. Ascertain insulators are clean.
o. Timing and ventilator plugs. Ventilator has drilled holes and should be in lowest hole in magneto
to sene also as drain for excess water or oil. Solid plug is used in other hole - or in location exposed to rain
or water.
!'OTE
REVISED: 4/10/81
The magneto service instructions in this manual are to cover minor
repairs and timing. For further repairs and adjustments of the
magnetos. it is recommended that the manufacturer's service
instructions be followed.
2B8
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POWER
PLA~T