VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1929-1932 1931 Chevy Clutch pressure plate.

I have checked all of my books and I can't find this stamping number listed anywhere. I hve two clutch pressure plates. Both with the stamping number of 835821. Are these right for my 1931 Chevy car? They fit the flywheel just fine but before I removed the engine I had trouble starting out. As I let the clutch out the car would jerk several times until I got moving. It did not make any difference how slow I let it out. Once I got moving, shifting into 2nd or third was no problem. I have evrything apart now and can't see anything wrong. Has anyone else had this problem?

The 835821 cover is listed for 29-31 in my MPPL(master parts price list).The disc perhaps may need relining or the splines on the disc or shaft may be worn.

Thanks, Is there a way to tell if the tension on on clutch pressure plate is corrrect or isn't that a isssue? I checked the spines and they seem to be fine. Is there a good outlet for a new or reman clutch disc? The one that was in there looks like new and shows very little wear.

If your clutch disc looks like new and shows very little wear there is no need to get a new or remanufactured clutch disc.

:) :grin:;)

If the pressure plate is weak I would think it more apt to slip than grab or jerk.Problems that can cause these symptons include oil or grease on the disc,binding linkage,loose facings(rivets)on the disc,binding of the disc on the the clutch shaft,or broken springs in the pressure plate.I did have the same problem and relining the disc cured it.

Also check your pilot bearing for wear or even possibly missing, if you haven't ever had it apart. I have seen people leave them out or not replace a badly worn one. Oil or grease on the disc is the most logical cause though.

I Have checked everything and cannot find anything wrong so far. I am going to send in my old clutch disc and have it relined but I have a questions about the disc. I have two of them. The one that I took out and another one that came out of a 1930 chevy engine. They are different in the reguard to design. One has springs around the center and the other one does not. Which one would you get relined? Does it make a difference? They are both in good condition but would rather have one relined and hope it solves my problem.

The original '31 clutch plate did not have springs. Springs were first used in 1932 plates. It is critical for the solid or segmented plates to still have the wave or offset in them. The plates with springs are considered to be an improvement as they continue to modify the harshness of the engagement through out their usefill life. The solid or segmented discs rely on glazing of the facing to modify the engagement after the surface is worn flat.

The problem may not be in the clutch or pressure plate but other drive line looseness.