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Parts Replacement & Testing: Commutator

  1. Inspect commutator for roughness. If surface is pitted, stepped or grooved, it should be lightly sanded with No. 400 sandpaper. Check commutator for out-of-round.
  2. If out-of-round is more than 0.002" (.05 mm) on Toyota, or 0.001" (.03 mm) on Honda, turn commutator on lathe until out-of-round is within specification. On Subaru models, outer diameter of commutator should be 1.18" (30 mm). Wear limit is 1.14" (29 mm).
  3. If worn to less than 0.008" (.20 mm), insulating mica should be undercut to a depth of approximately 0.028 - 0.035" (0.71 - 0.89 mm) on Toyota diesel models, and 0.015 - 0.031" (0.40 - 0.80 mm) on all other models.
  4. Wear or cutting limit of commutator is 1.22" (31 mm) for Cressida and Supra, 1.26" (26 mm) for Civic, and 1.14" (29 mm) for all others.
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