Piper Dakota - Alternator Service Tips; Alternator Service Test Specifications

ALTERNATOR SERVICE TIPS
l. Bearings: These units have a sealed ball bearing at the drive end and a two-piece roller bearing at slip
ring end. Press inner race onto rotor shaft. The rest of bearing is in slip ring end head. When unit is
assembled, inner race aligns with bearing. When bearing is replaced, new inner race must be installed
on rotor shaft.
2. Lubrication: Lubricate slip ring end bearing whenever alternator is disassembled. Clean bearing
thoroughly and repack with Shell Alvania No. 2 or an equivalent bearing lubricant. Pack cavity behind
bearing one-third to one-half full with same lubricant.
3. Brushes: These units have a separate brush holder assembly that is installed after the alternator has
been assembled. The brush holder has a small hole that intersects the brush cavities. Use a pin or a
piece of wire, as shown in figure 24-40 to hold brushes in holder during assembly. Remove pin after
brush holder retaining screws have been tightened. Make a continuity check to be sure brushes are
seated against slip rings.
4. Drive Pulley: Tighten drive pulley retaining nut to a torque of 35 foot-pounds.
ALTERNATOR SERVICE TEST SPECIFICATIONS
CHART 2403. ALTERNATOR SPECIFICATIONS
Alternator Model Prestolite ALY 6422(1) Chrysler 3656624(2)
Chrysler 4l1l810(3)
Voltage 12 volts 12 volts
Rated Output 60 amperes 60 amperes
Ground Polarity Negative Negative
Rotation Bi-Directional Clockwise at
driven end
Rotor:
Current Draw
(70°F to 80°) 2.4 to 4.0 amps @ 12.0 volts 4.5 to 6.5 amps @
12.0 volts
Resistance
(70° F to 80° F) 3.5 to 5.0 ohms l.5 to 2.0 ohms
Output Test (77
0
) 2000 rpm (min.) 4000 rpm (min.) l250 rpm
Volts l4.0 l4.0 l5.0
Amperes Output l3.0 47.0 57.0 (min.)
(1) AIR-CONDITIONED AIRCRAFT
(2) NON-AIR-CONDITIONED AIRCRAFT S/N: 28-7911001 TO 28-7911087
(3) NON-AIR-CONDITIONED AIRCRAFT S/N: 28-7911088 AND UP
24 - 33 - 00
Page - 24 - 35
Reissued: August 1, 1986
1J10
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL