Chevrolet 1977 10 Series, Repair Manual, Page: 226 / 468

6D-4
OVERHAUL MANUAL
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Fig. 6 D -5 S --A rm a tu re G rou n d T est
Field Coil Replacement
Field coils may be removed from the field frame using
a pole shoe screwdriver and a pole shoe spreader. The
spreader prevents distortion of the field frame. Careful
installation of field coils is necessary to prevent shorting or
grounding of the field coils as the pole shoe screws are
tightened in place. Form ed insulators are used to protect the
field leads from grounding to the frame and m ust be replaced
with assembly.
Loose Electrical Connections
When an open soldered connection of the arm ature to
com m utator leads is found during inspection, it may be
resoldered provided resin flux is used for soldering. Acid flux
should never be used on electrical connections.
When inspection shows com m utator roughness, it
should be cleaned as follows:
Fig. 6D-6S--Field Coil Open C ircuit Test
Fig. 6D -7S --F ie ld C o il G ro u n d Test
Turning The Commutator
1. T urn down com m utator in a lathe until it is
thoroughly cleaned.
CAUTION:
Some starter m otor models use a
molded armature commutator design and no
attempt to undercut the insulation should be made
or serious damage may result to the commutator.
Undercutting reduces the bonding o f the molding
material which holds the com- mutator bars and
since the molding material is softer than the copper
bars, it is not necessary to undercut the material
between the bars o f the molded commutator.
2. U ndercut insulation between com m utator bars 1/32".
This undercut m ust be the full w idth of insulation and flat
at the bottom ; a triangular groove will not be satisfactory.
After undercutting, the slots should be cleaned out carefully
to remove any dirt and copper dust.
3. Sand and the com m utator lightly with No. 00
sandpaper to remove and slight burrs left from undercutting.
4. Recheck arm ature on growler for short circuits.
Brush Holder Replacement
If brush holders are damaged, they can be replaced by
special service units.
Overrunning Clutch
The overrunning clutch (roll clutch design) used in the
various starting m otors is (fig. 6D-8S) designed to be serviced
as a complete unit.
A S S E M B L Y
A fter all parts have been thoroughly tested and
inspected and worn or dam aged parts replaced, the starter
should be reassembled.
1. Assemble brush rigging to field frame.
a. Assemble brushes to brush holders.
b. Assemble insulated and grounded brush holder
together with the "V" spring and position as unit on the
support pin. Push holders and spring, to bottom of support
and rotate spring to engage the "V" in slot in support.
c. A ttach ground wire to grounded brush and field lead