I picked up a Laura M48 engine this weekend for parts. The price was right...free. It's all good except for the piston and cylinder. I know they're sort of major parts, but a wanted the other stuff anyway so these are kind of expendable. The piston is totally locked in the cylender right near the bottom of the bore. I've had it soaking in penitrating oil for 2 days now and I've tried everything I can think of to get the piston unstuck. I just want to get the wrist pin out so I can salvage the crankshaft, but the little bugger just won't move. I've pounded the piston with a block of wood(shaped to fit the pistons curve) and a mallet. How hard can I\should I hit it without fear of shattering the piston. I've had experience with stuck pistons before, but nothing to tis degree. I'd swear the rings have melded with the cylender walls.
If anyone out there has ANY info or tips I can use, it would be much appreciated.