PIPER
COMANCHE
SERVICE
MANUAL
!'OTE
"0
attempt
should be made
to
stone
or
dress
contact
point,
Should
contact
a>sembl\
ha\e
bad
points
or
show excessive wear. the
complete
contact
assembly
should
be replaced.
e
Chec~
the
condition
of the
cam
follower felt. Squee7e felt tightly between
thumb
and
forefinger.
If fingers are not moistened with oil. re-oil using 2
or
3
drops
of
Scintilla 10-86527 lubricant
Allowapproxi-
matelv
30 minutes for felt
to
absorb
the
oil Blot
off
the excess with a clean cloth.
Too
much oil
mav
foul
contact
points
and
cause
excessive
burning
.
78-39.
Removal
Of
Magneto.
a.
Loosen fasteners
and
lift
the
cowling side panel
b. Disconnect
high tension leads
(short
center lead)
from
the
transformer
c. Remove
the
four screws securing the harness bloCk
to
the
magneto
and
remo\e
block
d Disconnect
"p.
lead from
magneto
and retard lead if removing left
magneto
e Remove
nuts
and
clamps securing
magneto
to
engine
and
remo\e
magneto
78-40
Adjustment
Of
Magneto
Breaker
Points,
If
it
is
cenain
that
the
cam
has
not been mO\'ed since
manufacture
or
overhaul.
the
contact
assembly points can be
adiusted
by setting
them
at
0019
inch
(magnetos
5 "
01-27
and
up
are
adjusted
to
0016;!;
0002)
clearance
on
the high point
of
any
cam lobe
If the
cam
has been disturbed
or
if it
is
not
known
that
cam
has
been
moved. time
magneto
using the
follow
ing procedure
!'OTE
Magnetos
of
late
manufacture
have a
brown
strip
of
glyptal painted
across
the cam retaining nut
and
the
cam
flange which
makes
it
possible
10
determine
If
the
cam
has been
disturbed
since
manu-
facture
or
o\erhaul
a The S700
magneto
has raised
timing
marks
as
shown
in Figure 7B,8.
The
center timing
mark
is
the
reference
or
beginning
point
for proper timing
and
represents
the
full register posit ion of the rota ting magnet.
The
"R"
and
"L" identify the two
additional
marks
to
be used for timing
either
a right-hand
or
left-hand
rotating
magneto
The
first
mark.
in
the
desired direction
of
rotation.
identifies
the
27°
paq
full register
instant
of
main
contact
assembly
opening
The
second
mark,
7-1
2°
later. identifies the instant of retard
contact
a"embly
opening
on retard
contact
assembly
magnetos
b Loosen
cam
securing nut
and
run
nut up flush with end
of
shaft.
Loo,en
nut
on
dri\e
end
of
rotor
shaft
Remove main
and
retard
contact assemblies
and
capacitor
from
breaker
support
assembl\" Rework a
plain
washer as shown in Figure 7B-9 Slide inSIde diameter
of
washer
against
rotor
shaft between
cam
and
breaker
support
assembly Tighten nut
on
drive end
of
magneto
until
cam
is
loose
on
rotor
shaft RemO\e
reworked
washer from housing.
ISSl"ED:
8/18/72
2F13
POWER
PLA"T
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