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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 Runout (1) Thickness Inch (mm)
    1.5L & 1.5L Turbo .016 (.40) 1.06 (27.0)
    (1) Minimum.
  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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