I am afraid beating on the pistons will deform and crack them....if you are not interested in saving them, that is no problem I guess. I had success un-sticking an old A-C tractor by cleaning the cylinders best I could with head removed and filling cylinders with PB-Blaster,covered with Marvel Mystery oil. As the engine soaked for about a week, I put the transmission in highest gear (1:1 ratio) and rocked the tractor back and forth by pushing on the rear tire periodically.....after several days, the pistons started to "quivver" a little and after a couple more days, the engine progressed to where the pistons would travel all the way up and down. I cleaned out the oil pan and fixed the source of water leakage into the cylinders, and she runs with good compression and no oil burning with no work done on pistons, rings etc. (never disassembled them and rings and oil re-surfaced the cylinders! I was lucky but gentle and patient.
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