8 - 25
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ELEC
STARTER MOTOR
EAS00770
CHECKING THE STARTER MOTOR
1. Check:
• commutator
Dirt
→
Clean with 600 grit sandpaper.
2. Measure:
• commutator diameter
a
Out of specification
→
Replace the starter
motor.
Commutator wear limit
27 mm (1.06 in)
3. Measure:
• mica undercut
a
Out of specification
→
Scrape the mica to
the proper measurement with a hacksaw
blade that has been grounded to fit the
commutator.
NOTE:
_
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
Mica undercut
0.7 mm (0.03 in)
4. Measure:
• armature assembly resistances (commuta-
tor and insulation)
Out of specification
→
Replace the starter
motor.
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a. Measure the armature assembly resis-
tances with the pocket tester.
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