Checking the end runout of the driven disk |
Checking the flatness of the pressure plate |
Check the pressure plate and basket for damage or deformation. If there is damage, replace the specified parts as a set.
Check the condition of the springs and splines of the driven disk. Oily linings of the driven disk cannot be cleaned. This disk is replaceable. Disc springs have different markings for different engines.
Check the clutch linings for further use. To do this, use a caliper to measure the distance from the surface of the disk to the rivet heads. If the obtained distance is less than 0.3 mm, the disc is replaced. It is also recommended to replace the disc if the distance is close to the specified one.
To check the end runout of the driven disk, it is mounted on a mandrel or the primary shaft of the gearbox and clamped in the centers of a lathe. Place an indicator next to the disc and press its measuring rod against the outer edge of the disc (illustration). Slowly rotate the disc and read the indicator reading. If it is more than 0.4 mm, the disc can be carefully straightened with pliers. Otherwise, the disk is replaced.
Check the splined connection of the driven disk. To do this, place the disc on the primary shaft of the gearbox and grab the outer edge with two fingers. Turn the disc one way and the other. If the gap exceeds 0.4 mm, this indicates wear of the spline connection. Wear usually occurs in the disc.
Check the inner ends of the diaphragm spring. If there are signs of severe wear, the clutch is replaced as a set.
The tops of the springs should be at the same height with a difference of no more than 0.5 mm. Bent ends can be straightened. There is a special tool for this. A steel bar with a slot can be used for this. If the spring tips have a wear of 0.3 mm, the clutch is also replaced.
Place a steel ruler on the friction surface of the pressure plate as shown in the illustration and measure the clearance with a feeler gauge. If the gap exceeds 0.3 mm, the clutch basket should be replaced.
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