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Just happened to come across this and thought it fitting...

They aren't that hard to find ... ESP usually has a few listed. here's an example https://www.easternsurplus.net/PartDetails/5097/HM-697-HMMWV-6-Point-5-Liter-General-Motors-Diesel-Engine https://www.easternsurplus.net/PartDetails/7695/HM-1243-HMMWV-6-Point-5-Liter-General-Motors-Diesel-Engine...

The easiest and probably the cheapest repair is a drop in take out engine. Upgrades, swaps and turbos will take much more time and money. Keep posting picture of the progress and good luck!

I guess but I don't think an oil spring would do that much damage to the surface. I'm not sure what they look like in one of these motors but that does look like threads. I was only guessing based on past experience with similar type of catastrophe.

Yes, that engine is toast. looks like there is 2, one on each side going to the water jacket.

This looks like a screw... Looks like threads in the top of that piston where the screw beat the piston to death....

On the driver side valve cover, is there a sticker identifying what engine you have? The 6.5 came as a GM and later GEP. The GEP being the better of them. Good luck and keep us informed.

First, I'm not sure what the HUGE space is in your initial post but I'd edit it and get rid of it. Second, basic testing would be in order to determine exactly what the problem is before tearing it all apart. Last, if it is "early GM" such as 6.2 and a 3 speed transmission or if it is 6.5/3sp...