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

TEST VALUES FOR CLUTCH

Number	Designation		Model 171.442	Model 171.454/456
BE25.10-P-1001-01A	Clutch diameter	mm	228	240
BE25.10-P-1002-01A	Lining thickness	mm	-	-
BE25.10-P-1003-01A	Max. total wear	mm	2.5	2.5
BE25.10-P-1004-01A	Max. lateral runout	mm	0.5	0.5
BE25.10-P-1005-01A	Thickness, uncompressed	mm	9.6...10.6	9.6...10.6

Checking pressure plate

Check friction surface (1a) of pressure plate (1) for scorch cracks and score marks.
Check diaphragm spring (1b) for fractures.
Check tongues (arrow) of diaphragm (1b) for wear and even height.

Fig 1: Identifying Pressure Plate Friction Surface And Diaphragm Spring
Courtesy of MERCEDES-BENZ USA

Checking clutch plate
Check friction lining on the drive and output side (2a) of clutch plate (2) for oil fouling, cracks and chippings.
Check friction lining thickness.
Check splined profile (2b) for wear and chippings. It must be possible to move the clutch plate (2) on the input shaft of the transmission with a small amount of force.

Fig 2: Identifying Clutch Plate Friction Lining
Courtesy of MERCEDES-BENZ USA