Piper Comanche PA-24 Service Manual page 717

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PIPER COMANCHE SERVICE MANUAL
FIGURE 9-2911. TURNING STARTING
MOTOR COIolMUT nOR
9-83. Fi.ld Coils •
FIGURE 9-29 •• TESTING MOTOR
ARIolA TUR! FOR SHORTS
•. Check the field coils fo< ""Wlds (Refer to Fieure 9-29d)
by
placiDg eme test probe
the frame and the other on the starter terminlli. Be sure the brushes are nCl accidentally touchin&
the frame. If the lamp liiht., the fields are gro""ded. Repair or replace.
b. Inspect all cOlUlections to .. ake sure they are clean and ti&ht ODd inspect insulation for
deterioration .
9-84. Br ••
h
H.ld ....
a. To test brush holders, touch one test probe to the brush plate and the other to each brush
holder.
b.
The test lamp should light when the grounded brush holders are touched and should not
light .. hen the insulated brush holders are touched.
9-85. Gear Ana Pinion H .. ling. 1a.spect housings for cracks and bearings for excessive
wear.
Remove ruSt, paint
01'
grease from lDountinl surfaces.
9-86. B.ndix Dri ••• The Bendix Drive should be wiped clean with. dry clClb. The pinion
FIGURE 9-29d. TESTING MOTOR
FIELDS FOR GROUNDS
abc~l1c1. tum smoothly in oae cHrectiCll and
should lock in the other direction. Replace
dri ye
if it fails to check
as aboye or if the
pinioa teeth are excessively wom or damaged.
9-87. A ..... bly.
So
When assembling the starting motor
I
always use an arbor press and the proper
bellini arbor for installing graphitiZed bronze
and roller hearings. The Bendix shaft should
have a thin film o[ L..l.lbriplate ;777 or equiva-
lent on the Bendix portion of the shaft. End
3 C17
ELECTRICAL SYSTFIoI
ISSUED: 8118n2