Checking pressure plate and clutch plate - AR25.10-P-0050-01A

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Checking pressure plate

Check pressure plate (6) for heat cracks and score marks, and the diaphragm spring for fractures (arrow).
Check tabs on diaphragm spring for wear and uniform height (arrows).

Fig 1: Identifying Pressure Plate
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Tabs On Diaphragm Spring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Checking clutch plate
Check friction lining (1a) of clutch plate on entry and exit sides for oil fouling, cracks and chipping.
Check thickness of friction lining.
Check damping springs (1b) for fractures and firm seating.
Check spline shaft profile (1c) for wear and chipping. It must be possible to slide the clutch plate on the transmission input shaft with little effort.

Fig 3: Identifying Friction Lining, Damping Springs And Spline Shaft
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.