"Paul Dow (Remove Caps in mail address)" wrote in
message ...
A member of our EAA chapter has a cylinder from a Franklin 150 engine (off
the engine.) The piston was pushed too far up and the top ring sprung out
so it now overlaps the cylinder sleeve which locks the piston in place.

Does anyone have a technique to get the piston out? Preferably while doing
the least amount of damage. (So no explosives, please!)

Take an old spark plug and break out the ceramic center, then thread the
steel body for a zerk fitting. Be sure both valves are closed, hook up
grease gun and start pumping; you might be able to build enough pressure
(grease guns are cabable of several thousand psi) to break the ring and
force the piston out or even push the liner out of the one-piece
cylinder/head.