Piper Cherokee Six - 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