Thrust Bearing damage - Why?

Cudafever said

Maybe i'm off base here but, you said the Rear Most thrust bearing.........If that's the case then it would NOt be from excessive pressure from the rear of the crank pushing forward.
With that picture i can tell which side is the rear part of the crank.

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in the pic the upper side is the rear thrust surface.

Bewy said

Only going by the photo, but the journal thrust surface looks rough. Some of the early Chinese cranks had quite roughly finished thrust faces & were wiping out the bearing.

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yes, it is rough - because it´s worn now. the other side is fine, just as it was when it was installed.

Thanks guys for your opinions, will call some machine shops to see if this is repairable - don´t know if this can be welded and ground back to original specs. Otherwise it should get a new crank.....did not have this on my to do list, so it hurts a little.