It's an oil-less compressor. Well this is a real simple piston/crank/sleeve combo. Nothing to adjust. The ring comes premoulded to the piston. The ring is made of some sort of hard rubber/leather. The cylinder wall isn't much more than a pop can. My guess is that tolerances never came to mind when designing this "Craftsman" compressor. Just sayin'
What I ordered is supposed to be a direct replacement for my model. This is what it
is. Now here is something I noticed that may be of interest. When in compression stroke there is much resistance. That is to say with all valves open. I would think there would not be resistance. But then I'm not sure what is going on in the head of the unit. I assume that the air goes through a check valve into the tank. Fairly simple?
