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Starter Component Tests: Commutator

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  1. Clean surface with No. 400 sandpaper if required. Check for continuity between commutator segments. If no continuity is present, replace armature.
  2. If surface is scored, out of round or pitted, turn commutator in a suitable lathe. Maximum commutator runout and minimum diameter of commutator must be within specification after turning. See NIPPONDENSO STARTER SPECIFICATIONS  table under STARTER SPECIFICATIONS.
  3. Commutator mica undercut depth should be .024" (.60 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut mica between segments using a hacksaw blade to obtain standard mica depth.