Pontiac tempest 1968 Service Manual page 356

E N G I N E E L E C T R I C A L
6 E - 7
4. Route battery cable and connect cable to bat­
tery post.
CHARGING CIRCUIT
GENERATOR
PERIODIC SERVICE
The generator does not require periodic lubrica­
tion. The rotor shaft is mounted on ball bearings at
drive end and roller bearing at slip ring end, and
each has a permanent grease supply which eliminates
need for periodic lubrication. At periodic intervals,
check mounting bolts for tightness and belt for
proper alignment, wear and tension.
CAUTION: When applying belt tension, apply
pressure at center of generator, never against
either end frame.
SERVICE PRECAUTIONS
Since both the generator and regulator in the
standard system and the C S I generator-regulator in
the integrated circuit are designed for use on only
one polarity system (negative ground) the following
precautions must be observed when working on
charging circuit. Failure to observe these pre­
cautions will result in serious damage to electrical
equipment.
1. Do not attempt to polarize generator. It is not
necessary since there are no permanent magnets.
2. Do not short across or ground any terminals
on generator.
3. Never operate generator on open circuit (with
field terminal connected and output terminal dis­
connected). Make absolutely certain all connections
in circuit are secure. If generator is operating on
open circuit, extremely high voltages may result
that are both dangerous and damaging to generator.
4. When installing battery, make absolutely sure
negative post is attached to ground strap.
CAUTION: Never reverse battery leads, even for
an instant, as reverse polarity current flow will
damage diodes in generator.
5. When connecting booster battery, make certain
to connect negative battery terminals together and
positive battery terminals together.
6. When connecting charger to battery, connect
charger positive lead to battery positive terminal
and charger negative lead to battery negative
terminal.
CHECK IN CAR
If electrical system is not charging properly,
follow the in-car checks outlined in Charging Circuit
Preliminary Checks, Figs. 6E-19 and 6E-21 in the
Diagnosis Manual, prior to removing generator.
Remove generator as follows:
REMOVE FROM CAR
1. Disconnect positive battery terminal.
CAUTION: Failure to observe this step may
result in an injury from hot battery lead at
generator.
2. Remove two leads at generator.
3. Loosen adjusting bolts.
4. Remove generator drive belt.
5. Remove bolts which retain generator.
6. Remove generator from car.
DISASSEMBLE GENERATOR
1. If rotor, drive end frame bearings or pulley
and fan need replacement, remove and replace shaft
nut using Allen wrench.
2. Scribe a mark between two halves of generator
to help locate parts in same position during
assembly.
3. Remove four through bolts.
4. Separate drive end frame and rotor assembly
from stator assembly by prying apart with screw­
driver at stator slot. The fit between the two is not
tight and the two can be separated easily.
NOTE: The separation is to be made between
stator assembly and drive end frame.
CA UTION: As rotor and drive end frame assem­
bly is separated from slip ring frame assembly,
the brushes will fall down onto shaft and come in
contact with lubricant. Brushes which come in
contact with shaft should be cleaned immediately
to avoid contamination by oil, or they will have
to be replaced.
INSPECTION AND REPAIR
ROTOR
The rotor may be checked electrically for ground­
ed, open or short- circuited field coils as follows: