1995 Geo Prizm Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Commutator Test

  1. Using "V" blocks and dial indicator, check commutator runout (out-of-round). See STARTER SPECIFICATIONS  . Turn commutator/armature on lathe until runout (out-of-round) is within specification.
  2. Check commutator diameter. If commutator is less than specification, replace armature. See STARTER SPECIFICATIONS  .
  3. Ensure continuity exists between any 2 commutator segments. If continuity does not exist, replace armature.
  4. Clean commutator segment surfaces with emery cloth and polish with No. 400 grit sandpaper (if necessary). If surface is scored, out-of-round, or pitted, turn commutator/armature assembly on a lathe.
  5. Measure undercut depth of insulating mica. Refer to the STARTER SPECIFICATIONS  . If mica depth is not within specification, undercut to specified depth using hacksaw or replace armature.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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