RE: Centerforce Clutch Problem - Update

[Brian Schlump <jsbs@xxxxxxxxxxxxx>]

Brian Schlump wrote:
 
Today I removed the clutch and checked it and the flywheel.  All the 
mounting bolts were tight.  The surface finish of each looked great, no 
heat checking or hard spots evident.  The machining marks were still 
obvious on the surface of the clutch, and the surface grinding marks 
were still obvious on the flywheel.  The thing that looked strange was 
the big difference in color on the face of the clutch plate.  One half 
looked a normal dirty steel color, while the other half was a dark blue 
/ brown color, almost like 1/2 of the clutch plate was contacting the 
disc differently than the other half.  The same thing appears on the 
flywheel, but the brown color wasn't quite as dark as on the clutch.  
I'm still puzzled....Brian

A guy suggested checking the surface of all the pressure plate/discs 
with a straight edge.He thinks they're cupped or warped. 
 
Dave Walters
Denver, Co.


That was a good call Dave.  I couldn't get an accurate check of the 2 
surfaces of the disc, however I could get a good check of the pressure 
plate.  I laid a staight edge across the plate so that it touched on the 
OD across the normal color over to the deepest blue / brown color.  At 
the ID of the normal color the plate had only cupped .001", but at the 
ID of the darkest discoloration, the plate had cupped .011".   I wonder 
if this cupping would account for the fact that some fingers on the 
diaphram were sticking up at a different height, and would not contact 
the throw-out bearing equally? 

Even though the flywheel still shows the original grinding marks from 
being resurfaced, perhaps I should remove it and have it ground again 
before installing a new clutch.  What do you think?...Brian  


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