Re: Yanmar 2GM20F
The rebuild parts are not too expensive. If, as Minnewaska has said, you get bearings fitted and valves redone in a shop, you should be able to save some bucks. I would remove the head first and check for how much wear is on the cylinder walls. Then plastigauge a couple of journals. Get an idea of general wear. If you see a big ridge or heavy scoring, it may be better to just order a brand new short block and reuse everything else.
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.