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ELEC
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2
EAS00769
CHECKING THE STARTER MOTOR
1. Check:
8commutator
Dirt J Clean with 600-grit sandpaper.
2. Measure:
8commutator diameter a
Out of specification J Replace the starter
motor.
Commutator wear limit
21 mm (0.83in)
3. Measure:
8mica undercut b
Out of specification J Scrape the mica
to the proper measurement with a hack-
saw blade that has been grounded to fit
the commutator.
Mica undercut
1.5 mm (0.06in)
TIP
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
8armature assembly resistances (commu-
tator and insulation)
Out of specification J Replace the starter
motor.
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a. Measure the armature assembly resis-
tances with the pocket tester.
Pocket tester
90890-03112 (YU-03112-C)
Armature coil
Commutator resistance
11
11
1
0.0252 ~ 0.0308
ΩΩ
ΩΩ
Ω at 20°C (68°F)
Insulation resistance
22
22
2
Above 1 M
ΩΩ
ΩΩ
Ω at 20°C (68°F)
b. If any resistance is out of specification, re-
place the starter motor.
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ELECTRIC STARTING SYSTEM
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