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ELEC
ELECTRIC STARTING SYSTEM
EAS00769
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.
NOTE:
_
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
Commutator wear limit
23.5 mm (0.93 in)
Mica undercut
1.5 mm (0.059 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.
b. If any resistance is out of specification,
replace the starter motor.
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Pocket tester
YM-03112
Armature coil
Commutator resistance
1
0.009 ~ 0.011
Ω
at 20 °C (68 °F)
Insulation resistance
2
Above 1 M
Ω
at 20°C (68 °F)