Checking clutch parts during repairs (Mercedes-Benz Vito W639)

Checking the release bearing

The release bearing can be replaced in the following cases:

• after bearing overheating;
• in case of uneven rotation (by hand) or increased noise from the thrust bearing.

Checking the pressure mechanism

This check consists of a detailed inspection of the friction surface of the pressure plate (1) for cracks, chips, and deep traces of wear. The spring is checked for cracks and chips on the petals (shown by arrow).



The outer part of the spring petals is checked for wear at the point of contact with the release bearing (shown by arrows). You should also pay attention to the fact that all spring petals have the same lifting angle.

Checking the slave disk

Checking the driven disk involves checking the friction linings (1) for excessive wear, as well as mechanical and thermal damage.

In addition, the damper springs (2) are checked for wear and damage.

The next check of the driven disk is to check the condition of the splined hub (3) of the disk.

Returning the ring of automatic adjustment of the gap between the release bearing and the petals of the membrane spring to its initial position

Install the clutch pressure mechanism removed from the engine onto the base (5).

Using a press (7) with a mandrel (6), carefully press on the petals of the membrane spring (1) so that the ring (2) of the automatic clearance adjustment is released.

Using a screwdriver, turn the ring (2) counterclockwise until it is in position (A).

After final assembly, press the clutch pedal at least 5 times to ensure that the adjusting ring is set to its working position.