PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
7A-30. INSTALLATION AND TIMING
PROCEDURE. (Timing Magneto to Engine.)
Although only the left magneto is equipped with
an impulse coupling, the timing procedure, in
the following paragraphs, is the same for both
magnetos.
a.
Remove the spark plug from No. 1 cylinder
and place a thumb over the spark plug hole.
Rotate the crankshaft in direction of normal
rotation until the compression stroke is
reached, this is indicated by a positive
pressure inside the cylinder tending to push
the thumb off the spark plug hole. Continue
rotating the crankshaft in direction of
normal rotation until the advance timing
mark of 25° on the front face of the starter
ring gear is in exact alignment with the
small hole located at the two o’clock
position on the front face of the starter
housing. (Refer to Figure 7A-13
NOTE: The advance timing mark on the top face of the starter ring gear is marked at both 20° and
25° BTC. When timing the magnetos to the engine, use the BTC degrees stamped on the
engine data plate.
NOTE: If the crankshaft is accidently turned in the direction opposite normal rotation, repeat the
above procedure as accumulated backlash will make the final timing incorrect.
b.
At this point, the engine is ready for assembly of the magnetos. Remove the inspection plugs from
both magnetos and turn the drive shafts in direction of normal rotation until the first painted
chamfered tooth on the distributor gear is aligned in the center of the inspection window. (Refer to
Figure 7A-14.) Being sure that the gear does not move from this position, install gaskets and
magnetos on the engine. Secure with washers and nuts; tighten only finger tight.
Figure 7A-13. Engine Timing Marks
VIIA - POWER PLANT
07/15/06
(PA-32-300/32R-300)
2H4
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