Disconnect the gearbox from the engine.
Unscrew the pressure plate mounting bolts evenly in several stages. This operation must be carried out very carefully so as not to distort the clutch housing.
Remove the clutch pressure and driven discs.
Check the wear of the clutch slave disk. The rivet heads should be recessed into the disk by at least 0.5 mm. If at least one of the linings is oily, it is necessary to identify the leak. If it turns out that oil is leaking from the gearbox, it is necessary to replace the gearbox primary shaft seal. At the same time, also check the condition of the shaft. The working surface of a slightly worn shaft can be wiped with 240-grit sandpaper. If the shaft shows signs of significant wear, it definitely needs to be replaced.
If oil leaks from the flywheel side, remove the flywheel from the shaft and replace the seal in the rear engine cover. If the crankshaft journal is worn out at the point of contact with the edge of the seal, it is necessary to remove the shaft and grind its journal.
Check the wear of the flywheel working surface. Check for burn marks on the surface. If there are deep scratches and traces of severe burn marks on the surface, it is necessary to remove the flywheel and grind its working surface interacting with the driven clutch disc. A layer of material no more than 1 mm thick can be ground. If traces of wear and scratches are still visible on the surface after grinding, the flywheel will have to be replaced. Install a new or repaired flywheel on the engine crankshaft and secure it with bolts tightened to the torques specified in section 1.1.
When replacing the clutch, the release bearing should always be replaced as well.
To install the driven clutch disc, place it on the mounting rod 21-103 or on the old primary shaft, settling it in the crankshaft hole. The surface of the driven clutch disc marked "Schwungradseite" ("flywheel") must be adjacent to the working surface of the flywheel.
The clutch housing with the pressure plate must be seated on the centering pins located on the edge of the flywheel. Tighten the bolts evenly in several stages (Fig. 3.1). In doing so, maintain the bolt tightening torque recommended in Section 1.1.
Removing the mounting rod or shaft used to center the disc should not be difficult. Otherwise, loosen the bolts and start centering again.
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