Piper Comanche PA-24 User Manual

PIPER COMANCHE SERVICE MANUAL
grall.d. The mapetic fOlCe created in the armalUre cCIDbimtd with tlsat created in the field wind-
ings basins to t1Im the armature.
The p .. cut 011 the citive eadof the armatllre shaftestellds throlllh the gear housi"ll,where
it is supported by a roller be_I. The .... mates with the teetb of the reduction lear that drives
tlse Bendiz shaft. The shaft is \asyed to the redueliCII 18". The Bendil< drive is beld ill position
CII the sbaft by a "spiral" pill. The shaft is sappaned in the .... housinl by a closed end roller
beariDl and in the piuion boa_ina by a """hitized brasH bearilli. -
When tlse _ature tllrllS the redactiOll 18", the Bendix drive pinion mesh .. with tbe fly-
wbeel riIIl Ie .. by inertia and actioa of the oc ... threads witbin the Bendix sleeve. A detent pin
enpge. ill a notcb ill the s ..... w threads which prevents d .... eshing if the eniPlle fails to start
wben the stertinl circuit is de-ene'liZed.
When tbe enpne reaches a predetermined speed, centrifugal action falCes tbe detent pill
out of the notcb ill the sctew shaft and allows the pinion to demesb frOID the f1ywhee I.
9-77. Waintenanc •• The statting circuit IhouLd be inspected at relU~ .. intervals, the frequency
of which .bould be determined by the amount cI. service alld conditions under which the vehicle
is operated. It is recommended that such iMpection be lIIade at least twice a year and include
the following:
a. The
bettery should be checked with a hyd .... et.r to be sure it is fully charged and filled
to the proper
level witls approved water. A load t.st should be made to detennine battery con-
dition. If dirt and corrosion have accumulated 011 the battery, it sbould be cleaned with a solution
of
builll loda cd ... ater. Be lure noae of the solution enters the battery cells.
b. The stutinl circuit wirina sbould t:. inspected to be sure that aU connections are clean
and !ilht and that the ill8u1atioa i. sound. A voltage lass test sbould be made to locate any high-
resistaace connections that W'DI.dd affect starting motor efficiency. This test is made with 8 low-
reading
voltmeter .. bile cranki", the engine or at approximately 100 ampe:e., and the follow,ng
IilOits Ihould be used:
1. Voltage loss from insulated battery post to starting motor terminal - O.3-volt maxunwo.
2. Voltage loss from battery ground post to .tarter &ame - O.l-volt maximum.
HOTE
U voltap 101. is greater than the above limits, additional tests
should be made over each part of the circuit to locate the high-
resistalEe connections.
c. No lubrication is required on the starting 100tor except II! the time of overhaul. Then lubri-
cate the entire shaft under Bendix Drive, fill crooves in amlature shaft at drtve end and pack
lear box w,th 1.3 to 2.0 ounces of Lithium Soap Base Grea .... 1925 Molyte. "0" or equivalent.
d. The
stutinl 1D0tor should be operated for a few seeoods with the ignition switch off to
lDake swe that the pinion. engages properly and that it tums freely without binding or excessive
noise. Then the engine sbould be started two or three times to see that the pinion disengages
properly .,hen the ealine is turned off.
3 C15
ELECTRICAL SYSTEM
ISSUED: 8/18/72

Piper Comanche PA-24 Specifications

General

Manufacturer	Piper Aircraft
Model	Comanche PA-24
Type	Light aircraft
First Flight	May 24, 1956
Number Built	4, 857
Seating Capacity	4
Engine	Lycoming O-360
Wingspan	36 ft (11 m)
Length	24 ft 8 in (7.5 m)
Stall Speed	62 mph (100 km/h, 54 kn)
Height	7 ft 6 in (2.3 m)