2030 Diesel Engine knock, how to diagnose?

I have a rebuild on my 1976 JD 2030 Diesel, about 20 hours on it. This was done by the shop I bought it from - the first motor had a head gasket leak and turned the oil milky after about 4-5 hours of use.

Now, with the rebuild, it seems to have a knock. I have checked the valves, not them. I cannot find an exhaust leak that would cause the noise. It increases in intensity as the oil warms up. You cannot hear it at idle and low RPMS, but as you hit mid and high RPMS it starts making a racket.

My question is this, how do I make sure it is a rod knock? Could it be injection pump timing retarded too far causing the noise? Can I tell by pulling the oil pan and retorquing the rods? Or do I have to pull the head/etc. to check for play.

Thanks for any direction folks.

Jon.

I'm at the point literally where the pain and money endured for learning and fixing myself sounds better than getting it back down to them and asking them to fix it. Long story, but unless they can give a loaner, I believe it would be fall when I saw it again.

jon

My bet is a bad journal.

Running too long with a knock will wipe out a journal or break the crank.

Drop the pan and see if you find any bearing metal. Plastigage the clearance.