I became concerned later though when I saw that the engine had lost a quart of oil in about 3 hrs of run time. There was no blue smoke showing ever, just a bit of black on start-up, so it couldn't be burning it, where was it going? I also noticed some grey and gooey emulsified oil in the breather cap when I added oil -- water in the crankcase?
It was when I started winterizing though that I spotted what might be the culprit. The oil cooler was a nasty looking thing that showed signs of braising repairs on both ends. When I drained the water passages, no oil came out (I caught the water in a pan and examined it) but it still was highly suspect to me. I decided to remove it and pressure test the oil chamber. That turned out not to be necessary though, because when I removed the oil hoses and drained that side, it was half oil and half water that came out.
Fortunately, that is a pretty generic part, and as long as the ports are correct (in this case, 1" water hose and 3/8" NPT oil line) you're good.
So for a little over $100 we're back in business. We just need a little Ford/Lehman red paint on there first. I wonder how much the PO paid to have it braised? Not money well spent I'd say.
Tom