Well Tom, it looks like you have some issues for sure.
I guess I didn't read your first post very well. That engine is too tight. That is why it is cranking so slow. Your going to have to take it out and rebuild it. I totally missed the part where you said it had run out of oil. You should never have attempted to start it without further inspection. Most likely what has happened is that the rod bearing are clear out of it or possibly even rolled to the bottom side. This is allowing them to smack the valves. Now, the pushrods are most likely damaged along with possibly the rocker arms or even the shaft. Good chance the exhaust valves are bent and not seating. I can't see any damage in the pics, or the vid, but that rocker tower shouldn't be moving like that. I bet you will find that the engine turns very hard by hand. The crank would have already been damaged from lack of oil, but is probably worse now that you ran it again. Need to just stop and either rebuild it, or get it rebuilt before more damage is done. Those are not cheap to rebuild. No aftermarket kits available. Main reason it won't start: not cranking fast enough. Sounds like the glow plugs are working.
As a note: The Kubota diesels are a very tight clearance motor. The piston is very close to the valves under normal operation.
Sorry for the bad news.
Note to all:
-Never try to start a motor that locked up from oil starvation. It will just cause more damage.
-There should never be marks on the piston indicating valve contact. A relief is just that. A place that has been "relieved", or cut out, to allow room for a valve. If the top of the piston is flat, there should be no marks on the piston from a valve.
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