Questions about resurfacing flywheel 2000cc

[Odoyle]

I have what appears to be the original valeo clutch removed from my 83 spider, and look like its worn down to the higher set of rivets on the plate. The clutch has been working with no problems, but since I'm rebuilding the trans, and it looks a little worn, I want to replace the clutch disk and possibly resurface the flywheel. I want to reuse the pressure plate because it is balanced to the flywheel already, so should I resurface the flywheel?

I have a new pressure plate and clutch disk made by CO.ME. which says "If machining of the flywheel is undertaken ensure that the same amount of the material is removed from both the friction and mounting surfaces, and machining or grinding must be made respecting the surface finish included between 2.4 and 2.8 Ra with CONCAVITY from the center to the outside included between 0.0 and 0.8 like about 2 degrees inclination." (CO.ME.)

Does that mean that the flywheel and the pressure plate must have the same amount of material removed from both to do this correctly? Maybe I'm interpreting that wrong? Would love to hear your guys thoughts.

[engineerted]

No, it just mean you need to maintain the step on the fly wheel as the friction surface is not flat to the mounting surface for the pressure plate cover.

[18Fiatsandcounting]

Hmmm, I would have assumed that the flywheel surface was flat, but after some Googling, it appears that some flywheel designs are concave or convex to help the clutch engage and disengage more smoothly (certain Jeeps for example). If your flywheel is like that, I would either go over it by hand with some light emery paper, or make darn sure your machine shops knows how to interpret the instructions from CO.ME and carry them out. Some online automotive forums give examples of folks who had to go get a new flywheel after their machine shop mistakenly machined everything flat and then the clutch didn't work right.

Concavity in the flywheel can be a sign of warping (excessive heat), but not always. If it ain't broke, don't fix it??

-Bryan

[80spiddy]

I work in a machine shop. I ground my flywheel flat on one of our grinders. Installed new pressure plate. All works flawless. Not sure why all the hoopla on the specs.

[Daddio]

Agree with EngineerTed, step must be maintained for proper 'grab' and disc life.