Piper Comanche PA-24 Service Manual page 596

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