ELEC
ELECTRIC STARTING SYSTEM
80
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 which has been grounded to fit the
commutator.
NOTE:
The mica must be undercut to ensure proper
operation of the commutator.
4. Measure:
• armature assembly resistances (commuta-
tor and insulation)
Out of specification
→
Replace the starter
motor.
a. Measure the armature assembly resistances
with the pocket tester.
b. If any resistance is out of specification,
replace the starter motor.
Min. commutator diameter
27 mm
Mica undercut
0.7 mm
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Pocket tester
90890-03112
Armature assembly
Armature coil resistance
1
0.026
0.034
at 20°C (68 °F)
Insulation resistance
2
Above 1 M
at 20°C (68 °F)
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