Clutch Disc Check

WARNING:

The clutch disc contains asbestos fibers. Avoid breathing the dust. Breathing asbestos dust may cause asbestosis and cancer. Failure to follow these instructions may result in personal injury.

WARNING:

Dust and dirt present on clutch assemblies may contain asbestos fibers that are hazardous to health when made airborne by cleaning with compressed air or by dry brushing. Failure to follow these instructions may result in personal injury.

WARNING:

Clutch facings should be cleaned using a vacuum cleaner recommended for use with asbestos fibers such as the brake/clutch/service vacuum. Dust and dirt from the vacuum should be disposed of in a manner that prevents dust exposure such as sealed bags. The bag must be labeled as per OSHA instructions and the trash hauler notified as to the bags contents. Failure to follow these instructions may result in personal injury.

WARNING:

If a vacuum suitable for asbestos is not available, cleaning should be done wet. If dust generation is still possible, technicians should wear government-approved toxic dust purifying respirators. Failure to follow these instructions may result in personal injury.

WARNING:

Grinding or sanding on the clutch facings should be done only while using correctly exhaust-ventilated equipment. Failure to follow these instructions may result in personal injury.

WARNING:

OSHA requires areas where asbestos dust generation is possible to be isolated and posted with warning signs. Only technicians concerned with caring out clutch service should be present in the area. Failure to follow these instructions may result in personal injury.

Check the clutch disc lining surface for hardening or the presence of oil.

Fig 1: Measuring Minimum Allowable Depth To Rivet Heads
Courtesy of MAZDA MOTORS CORP.
Check for a worn clutch disc lining. Measure the minimum allowable depth to the rivet heads with a slide caliper.
Check for loose clutch disc lining rivets.

Fig 2: Checking Maximum Allowable Runout Of Clutch Disc
Courtesy of MAZDA MOTORS CORP.
Using the special tool, check the maximum allowable runout of the clutch disc.

Fig 3: Removing Imperfections In Clutch Disc Lining Surface
Courtesy of MAZDA MOTORS CORP.
Use an emery cloth to remove minor imperfections in the clutch disc lining surface.
Check for wear or rust on the splines. If necessary, clean them with an emery cloth.
Check the clutch disc for cracking, scoring, discoloration or other surface marks. Install a new clutch disc if necessary.