Clutch: Description and Operation

DESCRIPTION





Manual transaxle equipped models (GTC Convertible) utilize a modular clutch assembly. The clutch system consists of a modular clutch assembly (Fig. 1), a sleeve type release bearing, a hydraulic clutch release system, and a clutch pedal that is part of a brake/clutch pedal bracket assembly. The transaxle must be removed to gain access to and replace the modular clutch, drive plate, and/or clutch release bearing and lever.

The modular clutch assembly consists of a single, dry-type clutch disc, a diaphragm style clutch cover, and an integrated flywheel. The clutch cover is riveted to the flywheel, containing the clutch disc within. The modular clutch can only be serviced as an assembly.

The clutch disc has cushion springs riveted to the disc hub assembly. The clutch disc facings are riveted to the cushion springs. The facings are made from a non-asbestos material.

The clutch cover pressure plate assembly is a diaphragm type unit with a one-piece diaphragm spring with multiple release fingers. The pressure plate release fingers are preset during manufacture and are not adjustable.

OPERATION

MECHANICAL





The clutch assembly is designed to transmit power from the engine to the manual transaxle. This is accomplished by the friction and clamping force generated when the spring loaded pressure plate locks the clutch disc to the flywheel (Fig. 2).

The clutch disc, which is splined to the transaxle input shaft, transmits power until the center of the diaphragm spring is depressed, and the clamp force is removed from the disc.

RELEASE SYSTEM - 2.7L/T850 TRANSAXLE





The clutch hydraulic system is responsible for engaging and disengaging the clutch. Depressing the clutch pedal develops fluid pressure in the clutch master cylinder. This pressure is transmitted to the slave cylinder through a connecting line. In turn, the slave cylinder operates the clutch release lever (Fig. 5).





The slave cylinder spring causes the release lever to hold the release bearing in constant contact with the diaphragm spring (release bearing preload). During a clutch pedal actuation, the hydraulic fluid pressure applies additional force to the release lever and bearing (Fig. 6). As additional force is applied, the bearing presses the diaphragm spring fingers inward on the fulcrums. This action moves the pressure plate rearward, relieving clamp force on the disc.