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Somehow your engine ingested a small solid object. Probably when you had the air intake exposed.
After ingestion, the object sat at the bottom of the cylinder during a shutdown and restart. When it got wedged between the head and piston is when it broke the liner.
This object also damaged the plug at one point.
Hydroloc bends connecting rods and the symptom will be low compression after the bending takes place.
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NH
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