Piper Cherokee Six - Page 386

PIPER
CHEROKEE
SIX
SERVICE
MANUAL
fore
top dead
center.
Tighten
the two
mounting
nuts
and replace
magneto
inspec-
tion plug.
e. Install
the
impulse
coupling
magneto
adapter
and gasket
on
the left
magneto
mounting
pad of the
accessory housing.
CAUTION
The impulse
coupling
magneto
can
be used
only
on
the
left
side of
the engine
(as viewed
from
rear).
f . Remove
inspection
plug,
depress
pawl
on impulse
coupling
shaft
and turn
im -
pulse
coupling
on
left magneto
until
the
white
beveledtooth
(or
middle
tooth,
if tim
-
ing
gear has
three beveled
teeth)
alignswith
the timing
pointer.
Without
allowing
the
magneto
gear
to turn
from
this
position,
assemble
the left
magneto
to the
ac-
cessoryhousing
and
securewithwashersand
nuts.
Tighten
nuts
only
finger
tight.
g. Connect
the other
positive
wire of the
timing light
to a suitable
terminal
con -
nection
of
the left
magneto
and
time
the magneto
in
the same
manner
as
described
for the
right magneto.
h.
After both
magnetos
have
been timed,
leave
the timing
light
wires
connected
and recheck
magneto
timing
as previouslydescribedto
make
sure that
both
mag-
netos
are
set to
fire
together.
If timing
is
correct,
both
timing
lights
will
go on
simultaneously
when
the 25
degree mark
aligns
with
the centerline
of
the crank-
case.
If the
breaker
points
open
too
early,
loosen
the mounting
nuts
and rotate
the magneto
clockwise.
If the
breaker
points open
too late,
rotate
the magneto
counter-clockwise.
Remove
timing
light
and ignition
timing
pointer,
and
replace
timing
inspection
plug
in magneto.
i .
After
the magnetos
have
been properly
timed,
clean
the
breaker
points
to
remove
any
trace of
oil or dirt.
Replace
breaker
cover
and lock
the
retaining
screws
together
with
lockwire.
NOTE
The crankshaft
should
not be
rotated more
than 10
de-
grees in
direction opposite
normal
rotation
as the pawl
on
the impulse
coupling
will
engage
with
the stop
pin
and
late timing
will be
indicated through
the
impulse
coupling
mechanism.
If
this should
happen,
rotate
crankshaft
in normal
direction
until
sharp click
is
heard;
this will
indicate
that
the impulse
coupling
has
passed
through
firing
position.
Turn
crankshaft
in
di-
rection
opposite
normal
rotation
to approximately
35
degrees
BTC
and
proceed
with
timing
check.
POWER
PLANT
Issued:
8/17/72
2F14