An otherwise good piston with all 3 rings stuck flush. Tried WD40 and later electric heat gun without results, My batting average with really stuck rings would not get me a spot on a sand lot team, Am I on right track with heat or are ther techniques those in the know use?
Put piston in glass jar filled with transmission fluid. put lid on jar. Submerge jar in ultrasonic cleaner with heater. run many cycles over a few days.
Tubs has a video about this on Youtube. I think a lot of tapping did save a seized piston ring if I remember correctly. I’ve read that a different approach to this is to run the motor with the stuck rings and they should free up, but this is not a reccomendation as I haven’t tried it. Just providing ideas.