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Commutator Testing

  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. See COMMUTATOR SPECIFICATIONS table.
  3. Commutator mica undercut depth should be .02 -.03" (.5 -.8 mm). Minimum mica undercut depth is .008" (.20 mm). If not within specification, undercut to standard depth.
COMMUTATOR SPECIFICATIONS

Application Maximum Runout In. (mm) Minimum Diameter In. (mm)
B2200 (M/T)
Protege (M/T) & 323 .004 (.10) 1.22 (31)
Miata .001 (.03) 1.22 (31)
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