8-21
STARTER MOTOR
ELEC
NOTE:
EAS00770
CHECKING THE STARTER MOTOR
1. Check:
S commutator
Dirt ! Clean with 600 grit sandpaper.
2. Measure:
S commutator diameter
a
Out of specification ! Replace the starter
motor.
Commutator wear limit
27 mm (1.06 in)
3. Measure:
S mica undercut
a
Out of specification ! Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commuta-
tor.
Mica undercut
0.7 mm (0.03 in)
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
S armature assembly resistances (commuta-
tor and insulation)
Out of specification ! Replace the starter
motor.
a. Measure the armature assembly resistances
with the pocket tester.
Pocket tester
90890-03112, YU-3112
Armature coil
Commutator resistance
1
0.0012 X 0.0022 Ω
at 20_C (68_F)
Insulation resistance
2
Above 1 MΩ at 20_C (68_F)
b. If any resistance is out of specification, re-
place the starter motor.
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