ELECTRIC STARTER
5-47
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.
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.
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
• Armature assembly resistances (commu-
tator and insulation)
Out of specification → Replace the
starter motor.
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a. Measure the armature assembly resis-
tances with the digital circuit tester.
b. If any resistance is out of specification,
replace the starter motor.
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5. Measure:
• Brush length “a”
Out of specification → Replace the brush
holder.
Limit
23.5 mm (0.93 in)
Mica undercut (depth)
1.50 mm (0.06 in)
Digital circuit tester
90890-03174
Model 88 Multimeter with
tachometer
YU-A1927
Armature coil
Commutator resistance
0.0090–0.0110 Ω at 20 °C (68
°F)
Insulation resistance
Above 1 MΩ at 20 °C (68 °F)
1. Commutator resistance
2. Insulation resistance
Limit
7.19 mm (0.28 in)
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