Check whether the driven disc springs are still in good condition and whether the disc splines are broken too much. Since oily linings of the driven disc cannot be cleaned, in such cases the driven disc must be replaced.
To check the clutch disc for runout, clamp it on a suitable rod or shaft between the ends of the rotary device (lathe).
Place a dial indicator with a suitable holder next to the disc so that the indicator probe rests on the edge of the disc, namely the outer edge. Slowly rotate the dikes and observe the indicator readings. If the reading is more than 0.4 mm, you can carefully flatten the disc with pliers, although this does not always give the desired result. If alignment fails, replace the drive.
Check clutch linings for reusability by measuring the distance from the lining surface to the top of the rivet head with a depth gauge. If this distance is less than 0.3 mm, then the disc must be replaced. This should also be done if this value is reached soon.
Check the clutch disc hub travel on the shaft splines. To do this, put on the disk and grab its outer edge with your thumb and forefinger. Scroll the disk back and forth. If the play is more than 0.4 mm, then there is wear in the spline connection. The reason for this is most often in the driven disk.
Check the inner ends of the diaphragm spring for wear at the points indicated by the arrows. If deep worn places are noticeable, then the clutch should be replaced completely.
In general, the following rule applies. The ends of the spring can wear up to half the original thickness, when you need to install a new clutch.
The ends of the diaphragm spring must differ from each other in installation height by no more than 0.5 mm. Curved petals can be straightened back. For this, special devices are used, but you can use steel strips with cuts and bend the petals.
Place a ruler on the friction surface of the pressure plate and measure the gap with a flat feeler gauge. If it is more than 0.3 mm, then the pressure plate must be replaced.
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