Judging by the amount of rust and corrosion in the picture I would say the pressure plate is probably frozen on the shaft. There are external teeth cut on the shaft and internal teeth cut on the plate that facilitate movement of engagement and disengagement of the clutch. Most likely will have to pull the engine but I would try a 50/50 mixture of acetone/transmission fluid to spray on everything and soak it. Then maybe a little heat and some light tapping of a hammer may free it up.
Good luck!
CrawlerAddict
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