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Bench Tests: Commutator

  1. Clean surface and polish with No. 400 sandpaper if required. If surface is scored, out of round or pitted, turn commutator in a lathe.
  2. Maximum commutator runout and minimum diameter of commutator must not exceed specification after turning.
    COMMUTATOR SPECIFICATIONS

    Application Maximum Minimum
    Runout Thickness
    Sprint (1), Spectrum .016 (.40) 1.06 (27.0)
    (1) Manual transmission only.
  3. Commutator mica undercut depth on all models should be .016-.031" (.40-.80 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut with a hacksaw blade to standard depth.
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