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Pinion Clearance Check

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
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.
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