Piston wrist pin puller

Actually a pusher not a puller...

This is my clunky solution... I have seen much nicer metal home-made pullers but have not got around to making one because the metal work takes more time than wood work... this might be of use to someone anyway.

Here is the apparatus, the block on the left is just to guide the deep socket that is used to push the pin out. The hole in the block on the right is where the pin is pushed into. The base has 4 holes that the cylinder studs in the crankcase pass through.

Here it is placed on the crankcase with the deep socket in place. Make sure that the socket is small enough to pass through the piston hole and large enough to engage the pin. Make sure the circlip is removed on the side that the pin will exit!

Here you see the adjustable C clamp in place. To push the pin all the way out you have to add an extension to the socket once it is flush with the guide block... unless you have a very deep socket.

Before installing a piston pin place a circlip on one side... then insert the pin from the other side and push it flush with the circlip. Heat the piston and put the pin in the freezer for awhile, put some oil in the hole and it will slip right in just using hand pressure, with a socket to get it seated against the circlip, but work quickly to maintain the temperature difference... and wear gloves the piston is hot!