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6D-44
1977 PONTIAC SERVICE MANUAL
is worn, dirty, out of round, or has high insulation, the
commutator should be turned down and undercut as
previously described.
Field Coils- The field coils should be checked for
grounds and opens using a test lamp. Typical circuits are
shown in Figure 6D-5 1.
1. Grounds
-
Disconnect field coil ground connections.
Connect one test prod to the field frame and the other to the
field connector.
If the lamp lights, the field coils are grounded and must
be repaired or replaced. This check cannot be made if the
ground connection cannot be disconnected (See Fig. 6D-52).
2. Opens
-
Connect test lamp prods to ends of field coils.
If lamp does not light, the field coils are open (see Fig. 6D-
53).
If the field coils need to be removed for repair or
replacement, a pole shoe spreader and pole shoe screwdriver
should be used. Care should be exercised in replacing the field
coils to prevent grounding or shorting them as they are
tightened into place. Where the pole shoe has a long lip on
the side, it should be assembled in the direction of armature
rotation.
Solenoid- A basic solenoid circuit is shown in Figure
6D-46. Solenoids may differ in appearance, but can be
checked electrically by connecting a battery of the specified
voltage, a switch, and an ammeter to the two solenoid
windings. With all leads disconnected from the solenoid,
make test connections to the soleniod switch terminal and to
ground, or to the second switch terminal, if present, to check
the hold-in winding (Fig. 6D-54). Use the carbon pile across
the battery to decrease the battery voltage to the value listed
in the chart at the end of Section 6D, and compare the
ammeter reading with the specifications. A high reading
indicates a shorted or grounded hold-in winding, and a low
reading excessive resistance. To check the pull-in winding,
connect from the solenoid switch terminal and to the solenoid
motor terminal.
NOTE: If needed to reduce the voltage to the specified
value, connect the carbon pile between the battery and
"M"
terminal as shown in dashed lines instead of across
the battery as shown in solid lines. If not needed, connect
a jumper directly from the battery to the
" M
terminal
as shown in dashed lines.
CAUTION: To prevent overheating, do not leave
the pull-in winding energized more than I5
seconds. The current draw will decrease as the
winding temperature increases. The purpose of the
"R"
terminal is to short out the ignition resistor
during cranking, and thereby provide higher
ignition coil output.
Overrunning Clutch
1. Test overrunning clutch action. The pinion should
turn freely in the overrunning direction. Check pinion teeth
to see that they have not been chipped, cracked, or excessively
worn. Replace assembly if necessary. Badly chipped pinion
teeth may indicate chipped teeth on the ring gear. This should
be checked under such conditions and replaced if necessary.
2. Check the overrunning clutch for slipping by leaving
the clutch attached to the armature, wrap the armature with
a shop towel and clamp the armature in a vice. Using a 15/16
12 point deep socket and torque wrench, put the socket on
the clutch and turn counterclockwise. The clutch should not
slip up to 50 ft. lb. (600 in. lb.) of torque. If it does, replace
the clutch.
Reassembly
1. Place the clutch assembly on the armature shaft. To
facilitate replacing the snap ring and retainer onto the
armature:
a. Place the retainer on the armature shaft with the
cupped surface facing the snap ring groove.
COMMUTATOR
COMMUTATOR
COMMUTATOR
L4, V-6, "U" V 8
"P, 2, K
and L" V8's
"Y
and
R" V8's
241 4
Fig. 60-5 1 Starter Motor Circuits
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