Service manual

ELEC
7-21
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.
N
O
TE:N
O
TE:
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.
Commutator wear limit
21 mm (0.83 in)
Mica undercut
1.5 mm (0.06 in)
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Armature coil
Commutator resistance
0.013 ~ 0.015 Ω at 20°C (68°F)
Insulation resistance
Above 1 MΩ at 20°C (68°F)
STARTER MOTOR