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I think these pictures worked? The second picture is a sample of some of the metal I pulled out of the pan. There is also a lot of fine metal. I'll add more tomorrow.
WOW. That's a lot of metal pieces to be found in the pan.
Looking at the head image by clicking on it and then clicking a 2nd time to zoom in, all looks fine except the top far left area above the cylinder area. Just a tad higher than the gasket surface, I see what looks to be a crack.
The good thing is, that crack is NOT on the gasket area, BUT, still needs tending to for welding or hot liquid steel filler. Yeah, it's a pain getting all those things out of the head and having it dipped clean. Now, I can be totally wrong, and the crack has nothing to go wrong in the future.
How do the cylinder sleeves look on their walls, bottom and top edges? Smooth, clean and no visible marks is a great thing.
Due note, everything on these machines is METRIC. Digital calipers would be real handy to check parts and clearances.
Whatever you do, try not tot mess with the engine governor or the governor rod-link. Even with re-assembly, do not apply pressure to move it out of the way, gentle get it where it should be.
On my previous JD850 (aka YM2500) the Yanmar 3T80 had a crack literally in the head of the cylinder circle. No possible way to fix.
That's when I went looking for a new head. Searched the entire North America region, learned much about John Deere 50 Series, and then kept getting Yanmar turning up. I was like, why is this happening. Found Fredricks, they had a head, but the place to rebuild the JD850, with the head, and getting it all running right was $1,000 less than getting a YM2500 or YM2610 totally 100% RESTORED to new like condition. I would have a machine with a great engine, but everything else decades old.
The good thing is, your parts so far are not destroyed. The middle piston crank-rod was snapped in two. Your image is far better. Less damage is GREAT.
If you elect a rebuild kit, align the rings just like the current engine rings on the pistons. The reason being, the rings allow a certain amount of engine oil to help lube the cylinder walls while the engine runs. Or, should the kit already have the rings on the pistons, turning them to position is rather easy.
Yes, keep us posted on the progress. There are many members here who have wisdom and knowledge with getting things rebuilt. Even folks on the Yanmar Tractor Owners Group too. So, don't be shy, ask away.