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ELEC
STARTER MOTOR
EBS01064
CHECKING THE STARTER MOTOR
1. Check:
• commutator
Dirt
→
Clean with 600-grit sandpaper.
2. Measure:
• commutator diameter
Out of specification
→
Replace the starter
motor.
3. Measure:
• mica undercut
Out of specification
→
Scrape the mica to
the proper measurement with a hacksaw
blade that has been grounded to fit the
commutator.
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.
a. Measure the armature assembly resis-
tances with the pocket tester.
b. If any resistance is out of specification,
replace the starter motor.
Commutator wear limit
19.5 mm (0.77 in)
Mica undercut
1.6 mm (0.06 in)
Pocket tester
P/N. YU-03112-C, 90890-03112
Armature coil
Commutator resistance
0.014 ~ 0.019 Ω at 20 °C (68 °F)
Insulation resistance
Above 1 MΩ at 20 °C (68 °F)
a
a
1
2