Clutch Driven Plate

The clutch cover assembly comprises a diaphragm spring, pressure plate and cover. The clutch cover assembly is mounted on and rotates with the flywheel and is located with three dowels and secured with six bolts.

The pressure plate is forged from cast iron and machined to provide a smooth surface for the clutch driven plate to engage on. Three lugs on the outer diameter of the pressure plate connect it via drive straps to the cover. The drive straps have three tempered steel leaves and pull the pressure plate away from the clutch driven plate when the clutch pedal is depressed. The cover is made from pressed steel.

The diaphragm spring comprises a cast ring with eighteen fingers on its inner diameter. Two circular steel fulcrum rings are attached to the cover and allow the diaphragm spring to pivot between them. The diaphragm spring is not physically attached to the pressure plate. When pressure is applied to the diaphragm spring fingers from the release bearing, the diaphragm spring pivots between the fulcrum rings and moves away from the pressure plate. The drive straps attaching the pressure plate to the cover also move away from the clutch driven plate.

Clutch Driven Plate

1 Cushion spring segments 2 Friction material

3 Splined hub

The drive plate is sandwiched between the flywheel and the pressure plate of the clutch cover assembly. The clutch driven plate has a splined hub which engages with the splines on the input shaft from the gearbox. One side of the drive plate is marked 'gearbox side' and must face the gearbox when installed. The hub is attached to a plate which also provides the attachment surface for the cushion spring segments which have the friction discs riveted to them.

The friction material comprises two discs which are riveted to each side of the cushion spring segments. The rivets are secured through recessed holes in the friction material and emerge in clearance holes in the opposite disc.

The clutch driven plate used is of the rigid centre type. The rigid centre drive plate allows angular movement of the hub at low torque levels with rotational movement cushioned by the dual mass flywheel. The Td4 drive plate is 228 mm (9.0 in) diameter and has a facing material manufactured from Valeo F808.