Slip Ring End Bearing Assembly; Testing Alternator - Piper Navajo PA-31 Service Manual

PIPER NAVAJO SERVICE MANUAL
369
370
SEAL-INSTALL
SEAL
WITH LIP
JUMPER WIRE
TOWARD BEARING
INNER RACE
f
E
GREASE
-
CAVITY
SPACER TEST VOLTMETER
BEARING
Figure 11-27.
Slip Ring End Figure 11-28. Testing Alternator
Bearing Assembly
e. Install the slip ring end bearing and oil seal.
Make sure the lip of the oil
seal is toward the bearing.
Correct assembly of bearing,
seal, inner race and
spacer is shown in Figure 11-27. Stake the seal in place.
f. Assemble
the alternator and install the through bolts. Spin the rotor
to
make sure there is no mechanical
interference. Torque the through bolts to 30
to 35 inch pounds. Safety wire should be installed
after the unit has been bench
tested for output.
Install spacer, woodruff key, fan, pulley, lock washer
and
nut. Torque the nut to 35 foot pounds, using a strap wrench to hold the pulley.
Do not install the blast tube assembly until after the unit has been bench tested.
g. Install the brush and holder assembly and retaining
screws. Spin the rotor
and check for interference between the brush holder and rotor.
Check across the
field terminals with an ohmmeter. The ohmmeter must indicate the amount of
rotor resistance listed in Alternator Service Test Specifications paragraph.
11-33. TESTING OF ALTERNATOR.
a. Wiring connections
for bench testing the alternator
are shown in Figure
11-28. Refer to the individual specification
pages for output test figures.
Adjust
the carbon pile. if necessary, to obtain the specified voltage.
b. After bench testing the alternator,
install the safety wire and blast tube and
install
the alternator on the engine.
Reissued: 10/12/79 ELECTRICAL SYSTEM
Effectivity
PRESTOLITE