I took the rest of the compressor pump apart. It was a mess. I figured that the piston seals had probably failed, and decided to replace those along with all of the gaskets. Everything was available on eBay. I also gave the tank a fresh coat of paint and replaced the wheels.
Once I got it all back together, it rand and filled up to 135 PSI and shut off as expected. I ran it for a while without issue. And then all of a sudden, it started making a horrible noise. I shut it off and took the head off, only to notice a blown gasket.
I don’t think I tightened the head bolts down enough. Another gasket is already on the way. Once that’s in, we should be good to go.
I am still hearing a small leak next to the tool pressure regulator. I’m not sure what I can do about that. I tried some teflon tape, but that didn’t help. It could be a crack in the plastic. I ordered a new regulator valve off eBay. That should take care of it.