If you’re in that deep and you’re going to keep the tractor, I would recommend rebuilding everything, heads, crankshaft bearing, piston bearing and rings, and then you know what you have
Enjoy the long-form as well. Hoping you find a racked wagon or a flatbed you can modify. Like having the tractor, baler and haybine all in one video. Hyped video. Are you thinking about a hay fluffed or tedder to help drying of the hay.
I would look into how much slop that worn piston has. Replace if needed. No such thing as worn rods. Id hole punch it and but a standard bronze bushing in. But since those are Babbitt rods it might be easier to buy the updated insert style.
Those rods should have a bushing for the waist pin. Looking at my parts book it doesn’t show babbitt waist pin bushing for a B. I’d throw a new waist pin and bushing in. Hone the cylinders and run it personally. Part # for bushing -b95999 is B413R B96000- is B1777R
Those engines were built with a low compression ratio on purpose to burn at the time cheap tractor fuel(distillate) or Kerosene. The rods will be fine. They just need new wrist pin bushings. The babbits are not in real good shape but will probably be ok. Pull shims out until the crank will not rotate. Add a shim back one at a time until it will spin freely. There is nothing wrong with the scoring on that piston. Hone the cylinders, put new rings on the pistons and it will be good long after you are dead.
Hey if parts for john deere B. Let me know because I know a guy. Lead washers seal the head. When you retork , the the head helps seal it. You have to get new lead washers. If you have trouble finding stuff , let me know.
1951 JOHN DEERE B REVIVAL: Finding the CARNAGE In the ENGINE!