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Pinion Clearance Check

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NOTE: Pinion clearance is not adjustable. If clearance is not within specification, replace starter assembly.
  1. Secure starter motor in vise with opening in housing accessible for measurement. Disconnect field lead at solenoid terminal "M" and insulate from solenoid field terminal "M". Connect battery negative terminal lead to starter frame. Connect 12 volts to starter solenoid terminal "S". Momentarily touch jumper lead from starter solenoid terminal "M" to starter frame, shifting pinion into cranking position. See Fig 1.
  2. Push pinion as far as possible away from retainer. Using a feeler gauge, ensure there is .01-.16" (.25-4.06 mm) clearance between pinion and retainer. See Fig 2.
Fig 1: Pinion Clearance Connections
G97H28040Courtesy of GENERAL MOTORS CORP.
Fig 2: Checking Pinion Clearance
G92H05218Courtesy of GENERAL MOTORS CORP.
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