ELECTRICAL
5.13
3. Remove brush plate and brushes. Measure
length of brushes and replace if worn past the
service limit.
Brush Length
5/16”
Brush Length Service Limit:
5/16² (.8 cm)
4. Inspect surface of commutator for wear or
discoloration. See steps 3-6 of armature testing.
5. Install a new carbon brush assembly in the brush
housing. NOTE: Be sure that the terminal bolt
insulating washer is properly seated in the
housing, and the tab on the brush plate engages
the notch in the brush plate housing.
ARMATURE TESTING
1. Remove armature from starter casing. Note
order of shims on drive end for reassembly.
2. Inspect surface of commutator. Replace if
excessively worn or damaged.
3. Using a digital multitester, measure the
resistance between each of the commutator
segments. The reading should be .3 ohms or
less.
4. Measure the resistance between each
commutator segment and the armature shaft.
The reading should be infinite (no continuity).
5. Check commutator 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 1/8² (.3 cm) above armature coil
laminates. Rotate armature 360°. If hacksaw
blade is drawn to armature on any pole, the
armature is shorted and must be replaced.
7. Inspect permanent magnets in starter housing.
Make sure they are not crackedor separated from
housing.
CAUTION:
Use care when handling starter housing. Do not drop
or strike the housing as magnet damage is possible.
If magnets are damaged, starter must be replaced.
STARTER REASSEMBLY
1. Place armature in field magnet casing.
2. Install case sealing O-Ring. Make sure O-Ring is
in good condition and not twisted on the case.
Lubricate the ends of the armature shaft and oil
seal with a light film of grease, and install housing.
3. Install O-Ring on the other end of field magnet
casing. Make sure it is in good condition and not
twisted on the case.
4. Install housing, pushing back brushes while
installing shaft in bushing.
5. Reinstall starter motor housing bolts. Make sure
O-Rings are in good condition and seated in
groove.
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