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EAS24790
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 diameter
28.0 mm (1.10 in)
Limit
27.0 mm (1.06 in)
a
3. Measure:
• Mica undercut "a"
Out of specification → Cut the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commutator.
Mica undercut (depth)
0.70 mm (0.03 in)
TIP
The mica of the commutator must be undercut to
ensure proper operation of the commutator.
4. Measure:
• Armature assembly resistances (commutator
and insulation)
Out of specification → Replace the starter
motor.
ELECTRIC STARTER
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a. Measure the armature assembly resistances
with the pocket tester.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance "1"
0.025–0.035 Ω
Insulation resistance "2"
Above 1 MΩ
b. If any resistance is out of specification, re-
place the starter motor.
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5. Measure:
• Brush length "a"
Out of specification → Replace the brushes
as a set.
Brush overall length
12.5 mm (0.49 in)
Limit
5.00 mm (0.20 in)
6. Measure:
• Brush spring force
Out of specification → Replace the brush
springs as a set.
5-38
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