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Pinion Clearance Check

NOTE: Pinion clearance is not adjustable. If clearance is not within specification, disassemble and check starter motor for worn or damaged components.
  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.
  2. Push pinion as far as possible away from retainer. Using a feeler gauge, ensure there is .02-.06 in (.5-1.5 mm) clearance between pinion and retainer. See Fig 1.
Fig 1: Checking Pinion Clearance
G92H05218Courtesy of GENERAL MOTORS CORP.