Assembly - Piper 6X Maintenance Manual

(c) Test the positive diodes by connecting one ohmmeter lead to the BAT terminal on rectifier
and other lead to each stator lead connection of rectifier momentarily. Reverse ohmmeter
leads and check in the opposite direction. Meter must show continuity in one direction and
infinity (no needle movement) in other direction.
(d) If continuity is observed in both directions, the diode(s) is shorted.
(e) If no continuity is observed in both directions, the diode(s) is open.
(f) Replace the rectifier assembly if open or shorted diodes are found.
(8) Assembly (Refer to Figures 18, 19, 20, and 21.)
(a) Clean all parts with a lint free cloth.
(b) Position the front bearing in the front housing and install the bearing retainer screws.
(c) Install spacer on rotor shaft and slide rotor shaft through housing and bearing.
(d) Install spacer, fan, pulley, flat washer, lock washer and nut. Tighten the nut to 60-100 ft.-
lbs. A special tool similar to that shown in Figure 18 is required to torque nut.
(e) If the rear bearing was removed, press a new bearing into place from inside the housing.
Apply pressure to the outer race only. Install dust cover over bearing end of housing.
(f) Install radio suppressor capacitor in rear of housing and install retainer screw.
(g) Install springs and brushes into brush holder. Install short length of 0.040 wire through
brush holder to retain brushes in place. Wire should be long enough to extend through
hole in housing for removal after housings are assembled.
(h) Install two retainer screws in brush assembly and housing. Hold down on brush assembly
while tightening screws, to prevent breaking brush assembly attachment brackets.
(i) Install insulator on BAT post of rectifier assembly and install insulators (2) in place in the
rear housing for mounting bolts in positive BAT side of rectifier.
(j) Carefully install rectifier and stator into rear housing. Ensure insulators are in place. Install
BAT post insulator and nut and GRD post retainer and nut, finger tight.
(11) Install the 4 rectifier retainer bolts (check insulators on positive side) finger tight. Install
suppression capacitor lead to rectifier and tighten screw.
(12) Tighten BAT and GRD retainer nuts then 4 rectifier retainer bolts.
(13) Install the 3 stator winding leads to rectifier posts and solder with 100 watt iron (to prevent
overheating of connection) and resin core solder. Solder stator terminal lead to diode

assembly.

(14) Position the front and rear housings together, align scribe marks on housings and stator,
and install four thru-bolts in housings. Alternately tighten each thru-bolt around alternator
until a preliminary torque of 15 to 25 inch-pounds is reached for each bolt. Final torque
each thru-bolt alternately around the alternator until each bolt is torqued 45 to 60 inch-
pounds.
(15) Spin pulley to ensure that alternator is free of binding or noise.
(16) Pull retainer wire from brush assembly and seal hole in housing with EP-711 sealant or
equivalent. (Available from Coast Pro-Seal Compton, California or equivalent.)
PAGE 18 24-30-00
Jun 1/03
THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
2G18