Piper Cherokee Six - Page 437

RED
PAINTED
TOOTH
Figure
7A-31.
Painted
Tooth
Centered
Figure
7A-32.
Timing
Mark
on
Rotor
in
Timing
Window
Aligned
with
Pointer
1.
When
the
final
timing
check
is
done,
back
the
engine
up
approximately
10
degrees;
then
carefully
bump
the
engine
forward
and
observe
the
position
that
the
breakers
open.
The
first
breaker
should
open
at
the
No.
1
engine
firing
position
and
the
late
breaker
must
open
within
3
engine
degrees
from
the
first
breaker
opening.
It
makes
no
difference
which
breaker
opens
first.
m.
Repeat
Step
k
if
necessary
until
conditions
of
Step
1
are
met.
If
the
late
breaker
opens
more
than
3
degrees
from
the
early
one,
the
internal
timing
of
the
magneto
must
be
rechecked.
(Refer
to
Internal
Timing,
Paragraph
7A-40.)
n.
Torque
the
magneto
securing
clamps
to
150
inch-pounds.
Recheck
timing
once
more
and
if
satisfactory
disconnect
the
timing
light
and
remove
the
adapter
leads.
o.
Reinstall
the
plugs
in
the
timing
inspection
holes
and
torque
to
12-15
inch-pounds.
Loosely
install
the
harness
with
clamps
and/or
brackets.
7A-40.
MAGNETO
TIMING
PROCEDURE
(INTERNAL
TIMING).
a.
Remove
magneto
cover.
b.
Loosen
flange
clamps
and
remove
magneto
from
engine.
c.
Check
condition
of
points;
replace
if
necessary.
d.
Rotate
the
magneto
drive
shaft
until
a
main
cam
lobe
touches
the
follower
of
the
left
main
breaker
assembly
and
adjust
the
breaker
points
to
an
initial
opening
of
.016
inch.
Wire
feeler
gauge
is
recommended.
e.
Adjust
right
main
breaker
contact
assembly
to
an
initial
point
opening
of
.016
inch
just
as
in
Step
d.
f.
Fixed
contact
support
may
be
bent
to
adjust
clearance.
If
support
is
bent,
main
breaker
contact
must
be
rechecked.
Torque
breaker
securing
screws
to
20-25
inch-pounds.
POWER
PLANT
Revised:
7/28/75
PIPER
CHEROKEE
SIX
SERVICE
MANUAL
2H17