1. Check the clutch disc lining for wear, mechanical damage or oil contamination.
2. If these defects are present, the clutch disc must be replaced.
3. If the friction linings are in good condition and not worn to the grooves, the damper springs are securely fastened and the rivet joints are not loose, the clutch disc can be installed in the car.
4. If the clutch disc is contaminated with oil, check the rear O-ring of the crankshaft or transmission input shaft. If necessary, replace the O-ring before installing a new clutch disc.
5. Check the drive plate assembly for pressure plate wear, mechanical damage, and reliability of the rivet connection. Check clutch diaphragm spring. If it is worn or damaged, or there is a suspicion that the spring elasticity has changed, then the drive disc assembly must be replaced.
6. Check up the working surfaces of a pressure disk and a flywheel interfaced with overlays of a disk of coupling. They must be clean, flat and free of scratches and gouges.