Another thing you can do before a complete disassembly is to remove the oil filter and cut it open. A full flow filter strains out the big chunks of metal from a failed bearing. How difficult is it to drop the oil pan? Sometimes it's easier to just pull the whole engine, but dropping the pan and looking for a loose or discolored rod might be a good preliminary step. By the time an audible knock is there, you'll probably need to regrind or replace the crankshaft due to wear or scoring.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!