Clutch Assembly: Inspection

Clean oil, grease, metal deposits, etc. from flywheel mating surfaces. DO NOT use air pressure to clean clutch parts. If flywheel runout is greater than .004" (.10 mm), flywheel must be resurfaced or replaced. Inspect flywheel for cracks, heat marks, warpage or other damage. Slight surface scoring can be removed with sandpaper. Replace or resurface as necessary.
Check wear on clutch disc's facing by measuring depth of each rivet head depression. If depth is less than .02" (.5 mm) at any rivet head or cracks in facing appear, replace clutch disc assembly. Maximum runout of clutch disc facing is .031" (.79 mm). Replace clutch disc if runout is not within specification.
Check pressure plate for warpage, heat marks (Blue color), cracks and diaphragm spring fingers for wear and uneven height. If pressure plate is excessively worn or damaged, replace pressure plate assembly. Check pilot bearing for smooth operation. If bearing does not spin freely, replace it.

Check wear on disc's facing by measuring depth of each rivet head. Minimum depth at any rivet is .012" (.30 mm). Maximum runout of clutch disc facing is .031" (0.79 mm). Replace clutch disc if not within specification.
Check pressure plate for warpage, heat marks (Blue color) and cracks. Check diaphragm spring fingers for uneven height and wear at throw-out bearing contact area. See Figure. Replace pressure plate if worn. Check pilot bearing rotation. If roughness is felt, replace bearing.
Inspect flywheel runout. Maximum flywheel runout is .004" (.10 mm). If runout is excessive, replace flywheel. Clean oil, grease and metal deposits from flywheel and pressure plate. Inspect for damage, cracks or warpage. Slight surface scoring can be removed with sandpaper. Replace or repair as necessary.