John Deere 3010 Diesel

I recently purchased a 3010 Diesel at auction.Tractor starts very good.When its idled up has a knock.Disconnected hyd pump.Still same knock.Removed timing cover and
flywheel appears to be tight. Any suggestions?
 
Those have a balancer inside the oil pan that can cause issues when worn out. Might also have a rod ready to toss out the block ? or a spun main ?
 
Is the noise in the top end or bottom end of the engine? It could be the mechanical balancer, a scuffed piston, or a spun bearing and a piston is hitting the head.
 

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