[Trackrash]

A couple of observations.

What motor is this? Actually Porsche says to heat pistons to remove the pins on some of the older motors.

Are the rods still installed in the motor?

An issue I have run accross is there could be a burr in the piston from the circlip. I have used a cutting tool to scrape this down to make the pin easier to slide out. I have also use a specially shaped piece of wood between the piston and the studs to steady the piston. This is especially helpful when installing the circlips.