STARTER BRUSH INSPECTION /
REPLACEMENT
1. Release the brush coil spring away.
2. Push the armature out of case.
3. Using an Ohmmeter, measure the resistance between the
cable terminal and the insulated brush. The reading should
be .3 ohms or less. Measure the resistance between the cable
terminal and brush housing. Make sure the brush is not
touching the case. The reading should be infinite (no reading).
4. Remove the brush plate and brushes. Measure the brush
length and replace if worn past the service limit.
Brush Length Service Limit
10 mm (0.40“)
5. Inspect the surface of the communicator for wear or
discoloration. See Armature Test.
4. Be sure that the terminal bolt insulation washer is properly
seated in the housing and the tab on the brush plate engages
the notch in the brush plate housing.
ARMATURE TEST
1. Inspect surface of communicator. Replace if excessively
worn or damaged.
2. Using a digital multi-tester, measure the resistance between
each of the communicator segments. The reading should be
3 ohms or less.
Armature coil resistance Continuity
Less 3Ω
ΩΩ
Ωat 20 °C (68 °F)
4. Measure the resistance between each communicator
segment
(No continuity)
Insulation check
InfiniteΩ
ΩΩ
Ω at 20 °C (68 °F)
5. Check communicator bars for discoloration. Bars discolored
in pairs indicate shorted coils, requiring replacement of the
starter motor.
6. Place armature in a growler. Turn growler on and position
a hacksaw blade or feeler gauge lengthwise 3mm(1/8〃)
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