hello,
You got the sulutiom from fhe Sketchyphysics MASTER himself.
I opend the file and played with it ,i have edited the joints setting of the joint on the crankshaft some what to get it working (the lubrication on my pc is probably not working very well).
I attached the working file for you
Greetings,
Bep van Malde
piston%20-%202[1].skp