I found the vent pipe, and it had some oil blown out of it although I coundn't tell if it it plugged. I will try to blow out the pipe with my compressor later to see if it helps.
There seems to be some knocking in the valve train, but I am not familiar with small diesels enough to know if it is a problem. I was told that the bottom end had been redone by a previous owner some time back, but I don't see why they wouldn't do the whole engine if they took the time to tear it apart. As I see it, you have to split the tractor and can't just drop the pan to redo the bottom end(It is like the 8n with the pan used as the frame, right?).
IT just has so much more power than my 8n that I can't see how the performance could be diminished.
Thanks for your response.