Mitsubishi Repair: Clutch problem in a mitsu 1985 Galant, spline shaft, clutch disk

Question
My car is a 1985 mitsubishi galant, which I am driving and slowly restoring to its original glory, to a point where it will be as if it just rolled out of a show room.

my problem is this,
driving the car for the last 2 years, I have replaced my clutch disk 4 times, ( brand new original parts and replacements) the broken part is the torsion spring plates. where the transmission spline is connected and the torsion springs are connected to the plate that hold the fiber friction material for the clutch disk.

The plates that connects the spline bushing to the spline shaft is torn lateraly in the direction of rotation, releasing all the tortion springs and producing a huge clunks as you try to drive
the friction material is okey and fairly new.

I have also tried to replace the pressure plates and fly wheels, it still broke on the second time I replaced the disk.

I tried to check if there is problenm with the transmission, and the mechanic could not find any deffects, it shift nicely like a hot Knife trough butter.

I have no oil leaks and the car can run perfectly as far as where the clutch disk would start to fail.

Please advice me, is there other point that I missed in diagnosing the problem.

Thanks.
Cezar.  

Answer
Cezar,
The problem you're describing kind of sounds like a problem that revealed itself in later turbo model Eclispes.  This problem was referred to as 'crank walk'.  These Eclipse owners would complain that they had to replace their clutch several times in a short amount of time.  What was happening was that the crankshaft was moving horizontally ever so slightly, but this was putting a lot of torsional forces on the clutch that it was not built to handle.  The crankshaft should not move at all horizontally.

Though the Eclipse problem stemmed from the crankshafts being made slightly out of spec.  This was causing failure of the main center thrust bearing.  Now, in your case, your crankshaft is probably fine, but you may need to replace the all the crank bearings.  If you are completely out of other items to check that could be causing your clutch issue, inspect your bearings, and you may find your problem there.
Good luck!