- check the condition of the driven disk spring;
- check the condition of the friction linings of the driven disk. If the distance from the surface of the linings to the upper side of the rivet heads is less than 0.20 mm, replace the disk;
Fig. 144. Measuring the runout of the driven clutch disc
- check the driven disk for runout. To do this, install it in a special mandrel in the chuck of a lathe. Install a dial indicator with a special bracket next to the disk so that the measuring rod is adjacent to the outer side of the disk (Fig. 144). Slowly rotate the disk and read the reading on the dial indicator. If the runout is more than 0.8 mm, replace the disk;
- check the fit of the driven disk hub on the splines of the gearbox input shaft. To do this, put the disk on and grasp it along the outer edge between your thumb and forefinger. Move the disk back and forth in the direction of rotation. If the play is more than 0.4 mm, there is wear in the wedge engagements;
Fig. 145. Areas of increased wear of the clutch diaphragm spring petals
- check the wear of the ends of the diaphragm spring petals (Fig. 145);
Fig. 146. Checking the wear or warping of the clutch pressure plate
- check the clutch pressure plate. The friction surfaces and the ends of the diaphragm spring petals are most susceptible to wear. The wear on the ends of the clutch diaphragm spring petals should not be more than 0.3 mm. Place a measuring ruler on the surface and measure with a feeler gauge in the place shown in Fig. 146 and in other places over the entire surface. If the gap in these places is more than 0.08 mm, the pressure plate must be replaced;
Fig. 147. Checking the flywheel for runout (only when replacing the flywheel)
- check the flywheel friction surface for deep grooves. The flywheel can be checked with a dial indicator either on an installed or removed engine. To do this, install a dial indicator on the cylinder block (Fig. 147). Place the measuring rod on the friction surface. Set the dial indicator to zero, turn the flywheel several times to the right and observe the deviation of the arrow. The flywheel runout should be no more than 0.10 mm.
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