Service manual

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ELEC
STARTER MOTOR
EB803511
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 which has been grounded to fit the
commutator.
NOTE:
The mica must be undercut to ensure
proper operation of the commutator.
Minimum commutator diameter
27 mm (1.06 in)
Mica undercut
0.7 mm (0.03 in)
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 pocket tester.
b. If any resistance is out of specification,
replace the starter motor.
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Pocket tester
YU-03112
Armature assembly
Commutator resistance 1
0.025 ~ 0.035 Ω at 20 ˚C (68 ˚F)
Insulation resistance 2
Above 1 MΩ at 20 ˚C (68 ˚F)
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