This photo shows the edge of the piston that has been worn/burned away. Apparently very common and nothing to lose any sleep over. This piston is reusable.
There are signs that this poor tractor has had a rough life - like in this photo of the PTO end of the crankshaft (valve tappets alongside). At some point in the past the clutch either came loose or the key gave way -- in any case the engine was operated while the clutch ground away on the shaft, nearly ruining it. The red arrows show a clever repair job where the shaft has been pounded with a centre punch to restore its diameter (the key has also been welded permanently in place). This is an expensive part so worth the repair attempt. Likely the person who repaired the shaft was not the same one who bashed the shit out of the end of it.
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