The diameter of the clutch discs and the clamping force of the driven disc depend on the engine power. Not all car models are equipped with the same clutch design. For this reason, when ordering spare parts, please indicate the engine type and its number. The diameter of the clutch discs may also vary depending on the vehicle model.
The clutch consists of the following main components:
- a) clutch drive, which includes the clutch pedal, the clutch drive cable with automatic adjustment, the clutch release fork and the release bearing;
- b) the clutch itself, located in the crankcase and including a pressure plate, driven plate and friction linings that engage with the flywheel.
When the clutch pedal is pressed, the clutch cable is tensioned and the clutch release lever presses the release bearing against the diaphragm spring. The pressure plate moves away from the flywheel, and the driven disk is no longer pressed towards the flywheel and rotates freely. In this way, the power connection between the engine and the gearbox is disconnected.
As soon as the clutch pedal is released, the diaphragm spring returns the pressure plate to the flywheel, thereby pressing the driven plate and restoring the power connection.
Slippage (slippage) the clutch becomes noticeable only when driving in high gear. At the same time, the effective engine power is maximum. In this case, the engine speed is higher than required for the gear engaged. When starting off, clutch slippage is almost imperceptible. The consequence of such a malfunction may be abrasion of the surface of the driven disk, the working surface of the pressure plate and the flywheel. Usually, when replacing the driven disk, the pressure plate also has to be updated.
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A functioning clutch should pass the following test without any problems.
1. Apply the parking brake.
2. Engage third gear by depressing the clutch pedal
3. Press the accelerator pedal and slowly release the clutch pedal. The engine should stall.
If you hear a clicking or scraping noise when you press the clutch pedal to change gears, this means that the clutch is not disengaging properly. It is recommended to first check the position of the floor mat under the clutch pedal. It is quite possible that it has shifted and is limiting the travel of the clutch pedal.
Caution! If the driver makes a mistake while shifting gears in a vehicle with a manual transmission and, for example, shifts from 5th to 2nd gear, the rotation speed of the driven clutch disc will be higher than the engine crankshaft speed. In such a situation, 2nd gear should not be engaged for some time. Engine speed can be increased by using synchronizing rings. However, due to the particularly high speed at which the pressure plate rotates, the friction lining may rupture, the parts of which become jammed under each other, thereby increasing the thickness of the driven disk to unacceptable dimensions. In this case, the clutch pedal may be fully depressed, but the clutch will not disengage or will not disengage completely.
If the car moves jerkily, this means that the transmission of torque from the engine is uneven. The reasons for such a malfunction may be different.
- a) A defect or weakening of the engine or gearbox suspension and as a result of the clutch being engaged, the power unit begins to vibrate.
- b) The friction lining on the driven disk is burnt or hardened. This may be the result of clutch overload.
- d) The pressure plate has become warped or its working surface has become crooked.
- d) The flywheel surface has become deformed, causing irregularities in the form of waves to form.
Attention! The clutch can only be replaced by removing the engine or gearbox. The pressure plate, driven plate and release bearing must be systematically renewed. Replacing the clutch cable requires adjusting the cable tension adjustment mechanism, especially in cases where the cable breaks. It is recommended to leave the replacement and adjustment of the cable tension to a workshop.