Piper PA-24 Comanche Service Manual page 466

PIPER COMANCHE SERVICE MANUAL
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FIGURE
7e·la.
ROTOR HOLDING TOOL
INSTALLED
FIGURE lC-l1. T1MING KIT INSTALLED
c. The retard conuct wembly of the dual-braker mapetos may
be
timed
II
foUows:
1. The retard conract assembly is adjusred co open a predetermined number of degrees after the
main contact assembly opens. The dqree of
mard
for any particu1ar
IDIpctO
is scamped in the bottom of
the breaker compatmleJu.
2. Locate the
exact
point of maiD contact: usembly openiaJ and set the 11-31-409 Poincer
Assembly over the 0 mark
Oil
the 11-3693 Ti.alinc Plate Asser.Ibly. Tum rounn,
rnapet
in
the direction
of normal rotation until pointer indexa with the dqrec of mari.
TiBhten adjult'inl knob of 11-8465
Holdinl Tool and
set
reu:d
contaCt UlCmbly co
ju.st
opa. within ...
f
..cf.
Tilhtcn
Rearin,
screws co
20.26 inch poullds. Loosen adjustiq leaob of holdu., cool and
tum
rotuint mapct until cam foUower is
on
high
pOint of cam lobe. Contact: cleuucc shill be 0.016 t 0.006 inch. If dimension is not within limits.
re-adjust coneact assembly and recheck to be sure chat poina will open within retard degree tolerance.
Remove the 11-8150-1 Tilnint Kit and
twO
sruds from the mapcto.
d. If the distributor block
WII
not removed from the houu" the internal timinl may be checked by
cumin.
the maencto in the
I'lOmW
rotation to number one
fll'inl
position (keyway up and main points just
openinJ). At this position. the reference line on the distributor block should line up between the L and LB
marks
on the
Jftt.
On sinIle contact mqneros the line should favor the L mark and on the dual contact
tnqDCEOS
the line should favor the LB mark. if possible.
e.
If the disaibutor block wu removed from the housinl. the distributor ,ear w,nment and internal
check may be accomplished as foUows:
1. Tum rotuinJ
mapet
in direction of rOtacion until it
is
located in firing position (keyway up
lnd main points just openinl). TiJhten adjustinl knob of 11-8465 Rotor Holding TooL Apply
l
light
coatint of Bendix Grease PIN 10.27165 to teeth of distributor lcu.
if
needed, The large distributor gear
incorporates four
timinl
marks. L and LB for left hand rotarion and R and RB for right band rotation.
2.
With dismbutor par assembled to block. rum ,ear WltU raised rib on block lines up between
the L and LB marks. Assemble block and par iDto housing. meshing the distributor ~
to!mer. For the
dua.! ccnuce assembly mapcto. distributor block rib must aIipI between painted marles. However. the rtb
should favor the LB mark.
if
possible. (Reier to Figure 7C-U.) On the sLnlle
COftUct
magneto the rib
should favor :he L marx.
POWER PLANT
ISSUED: 8118n2
2
H14
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