Clutch Assembly: Inspection

Check wear on clutch disc facing by measuring depth of each rivet head. Minimum depth at any rivet is .020" (.50 mm). See Fig 1 . Replace clutch disc if depth is NOT within specification. Measure clutch disc runout. If runout is greater than .031" (0.8 mm), replace clutch disc.

Fig 1: Measuring Clutch Disc Rivet Depth
Courtesy of GENERAL MOTORS CORP.
Check pressure plate for wear or damage. If pressure plate assembly is excessively worn or damaged, replace pressure plate. Check pilot bearing rotation. If roughness is felt, replace bearing. Inspect flywheel runout. If flywheel runout is greater than .004" (0.1 mm), replace flywheel.
Clean oil, grease and metal deposits from flywheel and pressure plate. DO NOT use air hose to clean clutch parts. Inspect for damage, cracks or warpage. Slight surface scoring can be removed with sandpaper. Replace or repair as necessary.