Time to clean everything up. I pulled the rusty valves apart (after cleaning the outsides up), and they range from not rusty at all to very, very rusty inside.
The inside and top sealing surface of the crankcase cleaned up. See that tub next to it? That sludge was inside before. Yuck. I’ve already cleaned off most or all of the old gasket at this point.
Here’s what the old gaskets looked like (I mostly removed them with a razor blade and a plastic scrubber).
Installing the new gasket at the other end.
And all back together.
After flipping it on, there seems to be some knocking in the valves and the hydraulic pressure is low. So a little more work to get over the finish line.