This is the first time I did this because the flywheel was spinning on the crank. I used a socket wrench with a 12" handle, held the engine down on my work bench and really cranked on it. That was the only way to get it off. I tried the screwdriver in the crankcase but it started to scar the crankcase. The top of the piston looks concave with a couple of cracks in it.

Okay, sounds like it was like that already. Not a huge deal. The engine was a part of a complete car. Just wanted to Know if I had done the damage.