Checking The Starter Motor

• commutator

Dirt ^ Clean with 600 grit sandpaper.

2. Measure:

• commutator diameter @

Out of specification ^ Replace the starter motor.

Commutator wear limit 27 mm (1.06 in)

Out of specification ^ Scrape the mica to the proper measurement with a hacksaw blade that has been grounded to fit the commutator.

Mica undercut 0.7 mm (0.03 in)

NOTE:

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 resistances with the pocket tester.

Pocket tester

90890-03112, YU-3112

□ ll Armature coil HI Commutator resistance ®

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