Figure 11-13. Slip Ring End Bearing Assembly
Figure 11-14 Testing Alternator
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, wing a strap wrench to hold the pulley.
g. Install the brush and holder assembly and retaining screws. Spin the rotor and check for interference
between the brush holder and rotor. Check between the field terminal and ground with an ohmmeter. The
ohmmeter must indicate the amount of rotor resistance listed in Paragraph 11-16 and Table XI-II.
11-13. TESTING OF ALTERNATORS.
Service Test Specification paragraph for output test figures. Adjust the carbon pile if necessary. to obtain the
specified voltage. The alternator is not to be run more than 2 minutes for each test point.
b. After bench testing the alternator, install the safety wire and install the alternator on the engine.
—NOTE—
Always refer to the appropriate alternator and starter schematic wiring
diagram when installing the alternator or testing the alternator.
11-14. PRECAUTIONS. The following precautions are to be observed when testing or servicing the electrical
system.
a. Disconnect the battery before connecting or disconnecting test instruments, except voltmeter, or before
removing or replacing any unit or wiring. Accidental grounding or shorting at the regulator, alternator, ammeter
or accessories, will cause severe damage to the units and/or wiring.
369
SEAL - INSTALL SEAL
WITH LIP TOWARD
BEARING
GREASE
CAVITY
BEARING
INNER RACE
SPACER
370
BATTERY
TEST VOLTMETER
TEST AMMETER
CARBON PILE
JUMPER WIRE
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
ELECTRICAL SYSTEM
2D6