[Shop-talk] how to loosen stuck pistons?

[BJNoSHOV8]

When I get time to mess with it again I may try the ATF/Acetone, that 
would be pretty easy to do.

When the engine was in the car I tried rotating the engine  I ended up 
putting it in high gear and putting a large pipe wrench on the 
driveshaft.  I put nearly 200ft-pounds on it and nothing moved.  This 
little engine won't develop nearly that much torque when running at full 
throttle.

I pulled the head off to investigate.  I PB'd the cylinders numerous 
times, let it set, and tried hitting the tops of the pistons with a 
block of wood and a small sledge hammer.  I pulled the engine out, 
pulled the pan, pulled a rod cap off and tried to knock that piston 
out.  I was being a little easy on it this time not wanting to damage 
the pistons from the bottom, but couldn't get any movement.  I'm not 
sure the pistons can be reused anyway.

> Good luck, just take your time.  If you do try tapping the pistons do 
> it gently.  Don't come down real hard
> with the hammer like you're trying to drive a nail home in 1 hit..