The inlaws have an old, tired Kubota M7500DT and an M8950DT. Also a farmall/IH 4-banger hydro...844? Anyhow, some questions for some of you folks who might be knowledgeable on the topic:

The M7500DT has a bit of blowby, and is pretty cold blooded. LOTS of hours; don't know how many. I'm assuming it's a wet sleeve motor - anyone ever done an engine rebuild on one?

The M8950DT has a crack in the block just above the oil pan. It was purchased that way for low cost. Nice rig otherwise. Is it feasible to find a used replacement engine and swap?

Thanks.