Starting System & Charging System: Starter: Inspection: Armature

Check the commutator for signs of seizure or stepped wear. If the symptom is minor, use sandpaper to repair. If it cannot be repaired, replace the armature.
Measure runout on the commutator.
Commutator runout:

Standard

0.05 mm (0.0020 in)

Limit

0.10 mm (0.0039 in)

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Measure the depth of the segment mold. If it is not within the specification, replace the armature.
Depth of segment mold:

Standard

0.50 mm (0.020 in)

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Place the armature on the growler tester to check for short circuits. While slowly turning the armature, support the steel sheet for the armature core. If the circuit of the armature is shorted, the steel sheet will vibrate, causing it to move towards the core. When the steel sheet has moved or vibrated, replace the armature.

Courtesy of SUBARU OF AMERICA, INC.
Check insulation between commutator segment and shaft. If there is continuity, replace the armature.

Courtesy of SUBARU OF AMERICA, INC.