HD11 Crawler Engine Repower

Anyone know what other engine will bolt up to the bellhousing or can be modified easily?

They originally had a 6 cylinder 516 cid Buda (AC) diesel engine in them. These are mid/early 50's vintage.

I can rebuild at least one of them mixing and matching parts making 1 good engine, but not enough stuff for the other without spending a ton of $$$$$$

John W.
P.S. The engines were obtained from a salvage yard, they were pulled out of totaled Kenworth Low cab trucks at around $4000 each.

One dozer has spun a few rod bearings and will no longer hold any and keeps spinning them, and needs a total rebuild. That dozer is my workhorse.

The second one has a good lower end, but the heads are cracked, so I may take parts from both and freshen up and make one running one, but still will need a crank, a few rods, and piston/sleeve assys, and 2 heads.

Will cost me about $3500 for the parts and reworking not including my labor. But this is my spare, and chains are worn into the pins, and will cost another $2000 for them parts, and will still need some more work after that.

So, guess the 2nd one will become a parts machine and will look around for another better shape one around here.