Piper Cherokee Six Service Manual page 384

CAUTION
If cam screw was removed be sure to replace flat wash-
er, lock washer and screw. Torque to 25 inch pounds.
NOTE
On Bendix 1200 and D2000 series magnetos, a new self-locking
cam retaining screw should be installed in place of the old
non-self-locking screw. Torque the self-locking screw from 21
to 25 inch pounds. Refer to latest revision of Lycoming Service
Instructions No. 1400 and Bendix Service Bulletin No. 608 for
additional information.
f . With internal
timing checked the magneto may be timed to the engine.
(Re-
fer to paragraph 7-27.)
7-27.
INSTALLATION AND TIMING PROCEDURE.
(Timing Magneto to Engine)
The magnetos
can be installed
and timed to the engine by the following pro -
cedure:
NOTE
Ascertain that the breakers are correct
for proper in-
ternal timing of magnetos.
a.
Remove the top spark plug from No. one cylinder. Place the thumb of one
hand over the spark plug hole and rotate the crankshaft
in directionof normal ro-
tation until the compression stroke is reached.
The compression stroke is in-
dicated by a positive pressure inside the cylinder
tending to lift the thumb off the
spark plug hole. In this position bothvalves of No. one cylinder are closed.
Turn
the crankshaft
opposite to its normal direction
of rotation until it is approximately
35 degrees BTC on the compression
stroke of No. one cylinder. Rotate the crank -
shaft in its normal
direction of rotation
until the 25 degrees mark on the starter
gear and the crankcase
parting flange are aligned.
b.
Rotate the magneto gear on the right magneto until the chamfered
tooth on
the distributor
gear inside the magneto aligns
with the white pointer as seen
through the window in the magneto cover.
Without allowing the gear to turn from
this position, assemble
the magneto and gasket. Secure magneto
in place with
washers and nuts; tighten the nuts only finger tight.
Revised: 12/15/80 POWER PLANT
2F12
PIPER CHEROKEE SIX SERVICE MANUAL