Technician Handbook ! 302 Manual Transmissions & Transaxles Clutch Disc The clutch disc is the connecting link between the engine and the transmission. A clutch disc provides a large surface area made of friction material on both sides. In the center, a damper assembly absorbs torsional vibration. The facing , or friction material is riveted to the cushion plate on both sides and is similar to the composition of brake lining. The cushion plate has a wave design that allows the facings to compress when the pressure plate is engaged. This provides a smooth engagement of engine and transmission.
Grooves are provided in the clutch disc facing to eliminate the problem of the clutch disc adhering to the flywheel and the pressure plate of the clutch cover assembly. Air is trapped in the grooves when the clutch is engaged. When the clutch disc is released, the centrifugal force of the turning disc causes the trapped air to push against the flywheel and pressure plate. This action breaks the adhesion created between the flywheel, clutch disc facing and pressure plate. 10 Technical Training