Check the clutch disc friction linings for wear and loose rivets, check the disc for edge damage, cracks, damaged springs and worn splines.
Typical broken clutch disc springs
If significant unevenness is detected, the friction pads can be cleaned with sandpaper.
Determine the wear of the clutch friction linings by measuring the distance from the surface of the linings to the top of the rivet heads using a caliper.
If this dimension is less than 0.20 mm, the disc or pads must be replaced.
(The original article was published on MitsubishiMan.ru)
CAUTION: It is always better to replace the driven disc assembly to avoid further problems.
Manufacturers do not recommend replacing only the friction linings. The authors' personal experience confirms this.
To check the runout of the driven disk, secure it between two rods or clamp the clutch shaft between the stop centers of a lathe.
Mount the dial indicator on a special holder next to the disk so that the indicator finger is located opposite the disk edge (at a distance of approximately 5 mm). Slowly rotate the disk and read the dial indicator. If the readings are more than 0.5 mm, you can carefully straighten the disk with pliers or replace the disk.
Check the sliding of the driven disk hub on the toothed rim of the clutch shaft. To do this, put the disk on and grab its outer edge with your thumb and forefinger. Move the disk in the direction of rotation. If the clearance is more than 0.4 mm, we can talk about wear of the wedge-shaped teeth, which most often occurs in the driven disk.
Check the wear on the inner ends of the diaphragm spring. If deep wear marks are found, the clutch needs to be replaced.
The ends of the membrane spring should be at the same height within 0.5 mm. Bent ends of the spring can be straightened. A special tool is usually used for this, but you can also bend the ends using a special strip with a cut.
Place a steel ruler on the friction surface of the clutch pressure plate and use a feeler gauge to measure the clearance at the location shown in the figure. The skew at this location should not exceed 0.5 mm.
If there are grooves, they must be removed by machine processing or the parts must be replaced with new ones.
Typical pressure plate with wear marks (grooves)