Testing Alternator - Piper SENECA II Service Manual

PIPER SENECA II SERVICE MANUAL
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TERMINAL
AUXILIARY
TERMINAL
Figure 11-7. Terminal Assembly
d. After the slip ring end head is completely assembled, the stator and rectifier leads must be
secured to the rectifier mounting plate with epoxy. Make sure the stator leads are positioned so that they
do not interfere with the rotor.
e. Install the slip ring end bearing and oil seal. Make sure the lip of the oil seal is toward the bearing.
Stake the seal in place. Correct assembly of bearing, seal, inner race and spacer as shown in Figure 11-8.
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.
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 Table XI-II.
11-13. TESTING ALTERNATOR. The alternator should be tested to determine if it is capable of
delivering its full rated output.
CAUTION
The flange mounted alternator requires a source of ventilation. Do
not test these alternators at full rated output for more than 30
seconds unless adequate air pressure for cooling is supplied.
a. Wiring connections for bench testing the alternator are shown in Figure 11-9. Output test
specifications are given in Table XI-II. Adjust the carbon pile if necessary to obtain the specified voltage.
b. After bench testing the alternator, install the alternator on the engine, making sure all mounting
surfaces are free of corrosion or foreign materials. Torque the alternator retaining bolts to the specifications
listed in the engine manufacturer's manual.
Reissued: 10/11/79
ELECTRICAL SYSTEM
2G6