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Commutator Test

  1. Clean and polish commutator with No. 400 grit sandpaper (if required). If surface is scored, out of round, or pitted, turn commutator on a lathe.
  2. Maximum commutator runout and minimum diameter of commutator must not exceed specification after turning. See STARTER MOTOR SPECIFICATIONS  table.
  3. Commutator mica undercut depth should be 0.02-0.03" (0.5-0.8 mm). If undercut depth is not within specification, undercut to standard depth.
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