Pontiac FIREBIRD 1972 Service Manual page 788

6E-26 1972 PONTIAC SERVICE MANUAL
grounded heat sink and base of the same terminal. If both
readings are the same, replace the rectifier bridge. A good
rectifier bridge will give one high and one low reading.
Repeat this same procedure between the grounded heat
sink and the other two terminals, and between the in-
sulated heat sink and each of the three terminals. If at least
one pair of readings is the same, the rectifie~ bridge must
be replaced.
NOTE: It is important that the rectifier bniige
be completely insulated to perfom the above
test.
CAUTION: Do not use high voltage, such as a
110 volt test lamp, to check this unit.
To replace the rectifier bridge, proceed as follows:
1. Remove the attaching screw and the "BAT" terminal
screw.
2. Disconnect the capacitor lead.
3. Remove rectifier bridge. Note the insulator between
the insulated heat sink and end frame (Fig. 6E-36).
BRUSHES AND/OR VOLTAGE REGULATOR (SI
AND 1 0 DN)
1. Remove two brush holder screws and one diode trio
lead strap attaching screw. Note the position of all
insulator washers for reassembly (Fig. 6E-32 and 6E-
33).
2. Inspect brush holder screws for broken or cracked
insulation.
3. Remove brush holder and brushes. The voltage
regulator (SI) or terminal and spacer assembly (10
DN) may also be removed at this time. Carefully note
stack-up of parts (Fig. 6E-36A) for reassembly.
INSULATING SCREW
(GROUNDED 10 DNI
INSULATING SCREW
Fig. 6E-36A Brush Holders
4. Inspect brush springs for evidence of damage or cor-
rosion.
5. Inspect brushes for wear or contamination.
6. If old brushes are to be reused, they must be
thoroughly cleaned with soft dry cloth and must be
completely free of oil.
7. If there is any doubt about condition of brush springs,
they should be replaced.
8. Install springs and brushes into brush holder (they
should slide in and out without binding). Insert
straight wood or plastic toothpick (to prevent
scratching brush face) into hole at bottom of holder
to retain brushes.
NOTE: Should any of the brush holder assem-
bly parts require replacement, it will be neces-
sary to replace the entire brush holder
assembly. Individual parts are not serviced for
this particular assembly.
9. Replace voltage regulator (SI) or terminal and spacer
assembly (10 DN).
10. Attach brush holder into end frame, noting carefully
stack-up of parts as shown in Fig. 6E-36. Allow wood
or toothpick to protrude through hole in end frame
and install stator or diode trio lead strap attaching
screw and washer.
1 1. Tighten remaining two screws securely.
VOLTAGE REGULATOR (SI ONLY)
For removal and replacement of voltage regulator in the
integrated circuit generator, see BRUSHES AND/OR
VOLTAGE REGULATOR.
The voltage regulator test must be made before the genera-
tor is removed from the car. (Refer to SI Diagnosis Figs.
6E-17, 6E-18, 6E-19 and 6E-20.)
SLIP RING END FRAME BEARING AND SEAL (SI
and 1 0 DN)
1. With stator removed, press out bearing and seal with
tube or collar that just fits inside end frame housing.
Press from outside ofhousing toward inside. Support
inside of frame with hollow cylinder to allow seal and
bearing to pass through.
2. ~ h k bearings in the generator are permanently lu-
bricated and require no lubrication during life of
bearing. If a dry bearing is encountered, do not at-
tempt to lubricate, as improper lubricant or excessive
amount of lubricant may burn bearing, or be thrown
off and contaminate inside of generator. Replace dry,