Piper PA-24 Comanche Service Manual page 570

P'PER COMANCHE SERVICE MANUAL
r---,
~I
.
~
•
FIGURE 9·27•• REMOVAL OF DRIVE
IND HEAD
'IGURI 9-27f. REMOVAL OF END
HEAD BlARING
MOTE
The inner race of the slip rilll end bearilll is pressed onto the
rotor shaft. When bearine replacement is nec....ry. always re-
place the complete beatine .lembly. inclllliini the inner r.ce.
f - To remove the drive end head from the rotor shaft. ale a puller that erips on the bearing
retainer plate as shown in Fieure 9-27e. Do not attempt to telllOVe by supportine the end head
.nd prassina on the shaft. as this may Nault in distortion of the end head or sttippine of the
retaimtr plate screws. R.move the three retainer plate screws and press the bearina out of the
end head. (Refer to Filure 9-21f.)
9-61e- In....cti.n Anti T.stin,
Of
eo..
po"e"... Upon completion of the disassembly. all parts
should
be
cleaned and visually
i~pected
for cracks. wear or distortion and any sieftS of
ever-
heatina or mechanical intett.Nllee.
a. Rotor: The rotor shou.ld be tested for erouaded or shorted .indinp. The croWld test can
be made witll tnt probes. COMecttd in series with a lll>voh test lamp. an oIllllllltter or any type
of continuity tester. (R.fer to Fiaurt 9-21,.) Thert lIIait not be any continuity between the slip
rinp and the rotor shaft or poles. To test for sborted turns in the rotor windine. connect a
volt-
meter. ammeter and rheoetat as shown in Fipre 9-27b. or lIIe an ohmmeter. Rotor current draw
and resistance are listed in the individual specification pal"' Exces.ive current dr•• or a low
ohmmeter readina indicates shorted windin.. .
~o
current draw or an infinite ohmmeter reading
wou.ld indicate an open windine.
b. Rectifie,,: A diode rectifier tester will detect and pinpoint open or shorted rectifiers
without IOinl throuah the operation of disl:oMectiDl the stator leads. Ho.ever. if a tester is not
available, test probes and a No.
Si
bulb. connected in series with a 12·Yolt battery. ean be used
in the followina maMer. Touch one test probe to a rectifier heat sink and the other test probe to
ELECTRICAL SYSTEM
ISSUED: 8/18n2
3 824
•
•