I bought and installed a cheap back up compressor to run while I repair this one. Now I have more time to fix this one.
I've been wondering what caused the bearing scoring. Was it run out of oil or lack of maintenance? It seems it was lack of maintenance. There is oil sludge in the crankcase and oil varnish on the stuck piston rings. The discharge valves are pretty rough at least 2 of the 3 need complete replacement. I think it will cost about $2k in parts to fix. I see replacement compressors, pump only for $11k. This thing is pretty big for a reciprocating compressor. It is rated at 55 cubic feet per minute at 175psi.