Clutch Cover and Disc Runout

CLUTCH COVER AND DISC RUNOUT

Check the clutch disc before installation. Axial (face) runout of a new disc should not exceed 0.50 mm (0.020 inch). Measure runout about 6 mm (1/4 inch) from the outer edge of the disc facing. Obtain another disc if runout is excessive.

Check condition of the clutch before installation. A warped cover or diaphragm spring will cause grab and incomplete release or engagement. Be careful when handling the cover and disc. Impact can distort the cover, diaphragm spring, release fingers and the hub of the clutch disc.

Use an alignment tool when positioning the disc on the flywheel. The tool prevents accidental misalignment which could result in cover distortion and disc damage.

A frequent cause of clutch cover distortion (and consequent misalignment) is improper bolt tightening.