Clutch elements: 1 — clutch housing; 2 — hydraulic drive slave cylinder with clutch release bearing; 3 — clutch hydraulic drive working cylinder tube; 4 - pressure plate; 5 — clutch housing; 6 — slave disk; 7 — flywheel.
Clutch housing (basket): 1 - diaphragm spring; 2 — casing; 3 - elastic steel plates; 4 — pressure plate.
Clutch slave disc: 1 - friction linings; 2 - torsional vibration damper; 3 - idle damper; 4 — hub.
The clutch is single-disk, dry, with a central diaphragm-type spring. It is located in an aluminum housing, combined with the housing of the manual gearbox and attached to the cylinder block.
The clutch housing is connected to the engine flywheel by six bolts.
The casing is connected to the pressure (leading) disk by three pairs of elastic steel plates. This unit (also called the clutch "basket") is balanced on a stand as a whole, so it is replaced entirely. A diaphragm spring is installed in the casing.
The "basket" needs to be replaced if the petals of the pressure spring are worn around the ring, and if the ends of the petals are not at the same level. We discard the "basket" if the pedal force decreases when disengaging the clutch, which indicates significant wear of the pressure plate surface or "settling" of the spring.
The driven disk with a spring torsional vibration damper is located on the splines of the gearbox input shaft between the flywheel and the pressure plate. Two friction linings of the disk are riveted on both sides to the spring plate, which, in turn, is riveted to one of the two damper plates.
The spring plate has a wavy shape. When the clutch is engaged, the friction linings compress the spring plate, which facilitates smoother clutch engagement.
The disk hub is installed between the damper plates. The damper springs are installed in the grooves of the hub and damper plates.
The damper plates are connected by support pins. In the disc hub opposite the support pins there are cutouts that allow the hub to rotate within certain limits relative to the damper plates, compressing the damper springs.
This allows to reduce dynamic loads in the transmission when starting the car and when changing gears. On the driven disk hub in a plastic housing there is an idle damper, which serves to dampen torsional vibrations and eliminate knocks in the gearbox when the engine is idling.
The driven disk is replaced if the axial runout of the linings is more than 0.5 mm, if there is oiling, cracking, scoring or uneven wear of the linings, if the riveted joints are loose, and also if the distance between the working surface of the lining and the rivet head is less than 0.3 mm.
The clutch release drive is hydraulic. The force in it from the pedal to the clutch release bearing is transmitted through the working fluid. The hydraulic drive consists of the main and working clutch cylinders connected by a pipeline. The clutch hydraulic drive reservoir is common with the brake system hydraulic drive reservoir.
Clutch pedal assembly components: 1 - pedal; 2 — bracket; 3 — pedal axle; 4 — clutch master cylinder; 5 — pedal travel limiter; 6 — push rod; 7 — pusher fork
The clutch pedal is mounted on the axis of the pedal assembly bracket. The pedal is connected by a pusher to the piston of the clutch master cylinder. To eliminate squeaks in the pedal assembly, the pusher fork is connected to the rod by an elastic connection - through a damper.
Clutch master cylinder with pushrod assembly
Pushrod fork components: fork; rubber damper; pad; screw; plastic cup
The hydraulic drive working cylinder is made as a single unit with the clutch release bearing and is located inside the clutch housing. The working cylinder body is attached to the clutch housing.
Clutch hydraulic drive elements: 1 — slave cylinder and clutch release bearing assembly; 2 — hose; 3 — adapter; 4 — bushing; 5 - tube
The piston of the working cylinder is connected to a bearing that can move along the primary shaft of the gearbox. Spring (covered with a rubber corrugated cover), located between the cylinder body and the bearing race, it constantly presses the bearing against the diaphragm spring of the clutch basket.
The clutch is released as follows. When the pedal is pressed, the hydraulic system of the drive creates pressure of the working fluid, as a result of which the piston of the working cylinder moves the clutch release bearing along the axis of the primary shaft of the gearbox.
The bearing presses on the petals of the diaphragm spring "basket".
The spring, deforming, stops pressing the pressure plate of the "basket" to the flywheel. At the same time, the driven disk moves away from the flywheel, as a result of which the engine crankshaft and the primary shaft of the gearbox can rotate independently of each other. When the clutch pedal is released, the bearing returns to its original position, and the diaphragm spring again begins to press on the pressure plate, which, in turn, presses the driven disk to the flywheel - as a result, the transmission of torque is resumed.
[The original material is located on the website chevyman]