Armature Assembly

WARNING: This page is about a different variant/trim than selected.

NOTE: Perform this inspection only for the models without Auto Start Stop.

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 assembly.
Measure runout on the commutator.
Commutator runout:

Standard

0.05 mm (0.0020 in)

Limit

0.10 mm (0.0039 in)

Courtesy of SUBARU OF AMERICA, INC.
Measure the depth of the segment mold. If it is not within the specification, replace the armature assembly.
Depth of segment mold:

Standard

0.50 mm (0.020 in)

Courtesy of SUBARU OF AMERICA, INC.
Place the armature assembly on the growler tester to check for short circuits. While slowly turning the armature assembly, 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 assembly.

Courtesy of SUBARU OF AMERICA, INC.