Thrust Bearing- Abnormal Wear

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If the crank was turned and the trust surface was also ground most likely the surface is to rough.. Ask me how I know. went thru 3 cranks and bearings on a 360 until I figured it out and took the last crank to a different machine shop that knew what the surface finish should be. No more problems sence.
 
the next time you put a reground crank in check the center main for run out 1 out of 5 cranks are bent (steel) I run into it all the time they should be straighten before grinding! the one you have looks like it was bent when you put it in.
 
The smooth part of that input shaft seems mighty long to me.

Yea it does.
I also agree on the little ring in the bottom of the crank register.
(Looks like it was pushing the crank forward)
Just for kicks I'd take about 1/4 in. off the end of that input shaft, but only if the pilot bearing rides far back on the shaft to allow it.
 
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