Remove the gearbox.
Gradually loosen the drive pin mounting bolts by 1-1.5 turns each time until it is relieved.
Caution: If the bolts are unscrewed immediately, the diaphragm spring may be deformed.
To prevent the flywheel from turning when unscrewing the bolts, block the flywheel with a screwdriver or rod.
[Article based on data from the website: mercedesman.ru]
Finally, completely unscrew the bolts.
Remove the drive and driven disks.
Caution: Do not drop the drive and driven discs when removing them, as this may result in difficulty disengaging the clutch or the clutch jerking after installation.
Wipe the flywheel with a rag soaked in gasoline.
To check you need to:
Check the drive disk for scratches and burnt areas.
Check the integrity of the diaphragm spring
Check the spring connections of the drive disk and cover for cracks and the reliability of the rivet connections.
Check the flywheel for scratches and burnt areas.
Treat the drive disk and flywheel with very fine sandpaper.
Oily and mechanically damaged drive disks must be replaced.
Measure the thickness of the drive disk linings with a caliper. The minimum permissible thickness is 7.5 mm. Otherwise, the disk must be replaced. The drive disk is also replaced if there are burnouts.
Check the edges of the diaphragm spring for wear. If wear is up to 0.3 mm, replace the disc.
Check the edges of the diaphragm spring for bending. If the height is uneven, bend the edges with pliers.
Check the spring windows, torsion springs and hub for signs of wear. With a composite flywheel, the driven disk has a rigid structure without dampers. In this case, torsion dampers are installed in the flywheel.
Remove the release bearing from the front gearbox cover and inspect it.
The runout of the driven disk is checked in the workshop. Lateral runout should not exceed 0.5 mm.
Note: This check must be carried out when reinstalling the previous driven disc and if there were previously difficulties in disengaging the clutch.
Check the ease of movement of the ball bearing in the crankshaft groove. If necessary, remove the bearing with a puller and replace it.
Before installing a new clutch, remove the anti-corrosion protective coating from it.
Insert the drive and driven disks into the flywheel. Place the drive clutch disk on the corresponding mounting pins. Center the driven disk in the drive disk. For centering, it is best to use a HAZET shaft or the primary shaft from an old gearbox.
When installing the previous drive disk, install it according to the marking. The marking should face the gearbox. a Screw in the drive disk mounting bolts.
Tighten the drive disk mounting bolts sequentially by 1-1.5 turns. Then remove the centering shaft.
Caution: When tightening the bolts, the drive disc must enter the flywheel evenly and freely.
Install the gearbox.