FIGURE
7C·10.
ROTOR
HOLDING
TOOL
INSTALLED
PIPER
COMANCHE
SERVICE
MANUAL
...
FIGURE
7C-11.
TIMING
KIT
INSTALLED
c.
Th.
retud
conuct
usanbly
of
the dual-breaker
mapetos
may be timed
as
foUows,
1.
Th.
retard
conuct
....
mbly
is
adjused
to
open a predetermined nwnber
of
dopecs
aft.r
the
main COnUct
....
mbly opens.
Th.
dqr
..
of
retud
for Uly particular magnetO
is
stamped in the
bottom
of
the breaker
compuanent.
2.
Locat.
the
euct
point
of
main
CODlact
assembly openiDJ Uld
let
the
11-8101-9
Pointer
Assembly over the
0
marl<
aD
the 11-8693 Timinc
Plat.
Assembly.
Tum
routing
magnet in
the
direction a
of
DOnna!
ralation
until pointer index
..
with the d
.....
of
retard.
Tisht.n
adjusting knob
of
11-8465 _
Holding
Tool
and
Set
retard
CODUct
....
mbly
to
just
open. within
.t'
.if.
Tight.n
securing screws to
2D-26 inch pouDds. Loosen adjusting knob
of
holding tool and
tum
rotating magn.t until cam follower
IS
aD
hiJh
point
of
cam lobe. Conlact clearance sball be
0.016
j:
0.006
inch. If dim.nsion
is
not
within limits.
r
...
djust contact
....
mbly and
r.ch
..
k
to
be
sur.
that points will open within retard
dope.
tolerance.
Remove
the
11-815D-l Timing Kit and
twO
sruds from the magneto. .
d.
If the distributor block was not remo..,d from the housing. the internal timing may be checked by
turning the
map.tO
iD
the
DOnna!
rotation to Dumber
on.
firing position (k.yway up and main points
jUst
op.ning). At this position. the reference line on the distributor block sbould line
up
between the L and
LB
marks
on
the
gear.
On singl. contact
magnetOS
the
lin.
should favor the L mark and
on
the dual contact
magnetOS
the
lin.
should favor the
LB
mark. if possibl
•.
•.
If the distributor block
was
remo..,d from the housing. the distributor gear alignm.nt and internal
check
may be accomplish.d
as
follows,
1.
Tum rotating
magnet
in
din:ction
of
rotation until
it
is
located
in
firing position (keyway
up
and main poiDts
just
opening). Tighten adjusting knob of 11-8465
Rotor
Holding Tool.
Apply.
light
coating
of
B.ndix Gr
....
PIN 10·27165
to
teeth
of
distributor gear.
if
needed. The large
dismbutor
gear
incorporat
..
four timing marks. L
ODd
LB
for left hand rotation
ODd
R
ODd
RB
for
nght
hand
toution.
2.
With
distributor gear
....
mbl.d
to block.
tum
gear until taised rib on block lin
..
up betWe.n
the
L and
LB
marks. Assemble block and gear
iDto
housing. meshing the distributor g
....
together. For the
dual
CODtact
assembly mogneto. distributor block rib must align betWeen pointed marks. How.ver. the rib
should favor
the
LB
mark.
if
possible.
(R.i.r
to Figure 7C·12.) On the
SlOgle
conuct
mogn.to the rib
should favor
the L mark.
POWER
PLANT
ISSUED:
8118m
2
H14
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