Diagnostic Aids

• Inspect the flywheel ring gear for damage or unusual wear.
• Shim the starter if applicable.
• In order to add pinion to ring gear clearance a full size shim must be used. Do not shim only one starter mounting bolt. There are 3 shims available in different shapes (for clearance). All are 0.039" (1 mm) thick.

Refer to illustration for STARTER MOTOR NOISE DIAGNOSIS symptom test. See Fig 1.

Fig 1: Starter Motor Noise Diagnosis Symptom Test

Courtesy of GENERAL MOTORS CORP.