Piper PA-24 Comanche Service Manual page 585

•
•
•
PIPER COMANCHE SERVICE MANUAL
Ifound. The lIleenetic fon:e created ill the armature combined with that created in the field wind·
inas belin. to t\lm the armature.
The par eut ee the drive "dof
the
armature sbaftesteads throuch theceer housi:tl. where
it is supported by a roller
~ariDe.
The par
IIl"S
with the teeth of
the
reduction aear that drives
the Bendix shaft. The shaft is keyed to tbe reduction ..ar. Th. Bendix drive is held in position
on the shaft
by
a "splrol." pin. The .hllft i_ lupparted iD the p . hauaiq by a clOHd end roller
bearine aod ill the piaion hou_iDe by a araPbitind bronze beariae.
When the armature tunll the reductiaa .... tbe Beftdix drive piaiOD Ift_hes with the
fly·
wheel rial lear by inertia and actioa of the screw threllds within th. Bendix sleeve. A detent pin
enpees in
a notch in the screw threads which prevents d.eshille if the -line fails to start
when the startine circuit is de-eneflind.
When tbe eline reacbes a predetetmiDed lpeed. ceDtrifucal Ktion forces the detent pin
out of
the
notch in the screw sbit and aUows tbe pinioa
tb
deale.b ftolD the flywheel.
9-77.
M.intenance.
on.
startine circuit should be inspected at repler iDtetvals. the frequency
oi. which sbould
be
determiJled
by
the amoUllt of servic:e and conditions under which the vehicle
is
operated. It
is
teCOIIUIlended that IIlcb inspection be made at le..t twice a year and include
the followinl:
a. The battery should be cbec:ked with a hydrometer to be sure it is fully curced and filled
to the proper level with approved water. A lac tnt should be lIlade to cletemine battery
CCll·
ditioll.
1£
dirt and ccrtOsion have acculllulated
OIl
tbe battery. it should
be
cleaned with a solution
of bUille soda ..d water. Be lute none
of tl,. solution enters the b.tery cells.
b. The startinl circuit wirine should
be
inspected to be swe that aU cOGneetions are clean
aod Heht and that tbe iaulation is sound. A voltace la.s tnt should
be made to locate any hiah.
resistance connections that would affect stertinllllotor efficiency. This test is made with a low-
readinl voltmeter while crankinc the en&ine or
at
approximately 100 ampe:es, and the foUowinl
limits should
be
used:
1. Voltace 10.. ftem insulated battery post to startinelftotor terminal· O.3-volt maximum.
2. Voltale 10" frem battery 1f000d post to Starter frllllte • O.l·volt maximwn.
MOTE
If volta. la.s
ia ereater than the above limitl. additional tests
sholl1d be lIIade over each
part
of
the cUcuit to loc::ate the hiah-
resistarce connections.
c. No lubrication is required on tbe startinelDotor except
lit
the time of overhaul. Then lubri.
eate the entire shaft under Bendix Drive. fill croaves in aallature shaft at drive end and pack
aear box with 1.3 to 2.0 ounces of UmiUII Soap a_e Gte... .:1925 Molytex "0" or equivalent.
d. Tbe startine motor should be operated for a few seeonci. with the lenition switch off to
lIlake SUfe that the pillion eftca,es properly and that it tums freely without bindina or excessive
noise. Then the enaine should
be
started two or three times to see that the pinion disenPles
properly when the an line is turned off.
ELECTRICAL SYSTEM
ISSUED: 8/18/72
3
C15