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I am just going to throw this into the mix even though I read it in the 616 FSM.. ( I do not know whether it is in the 671 manual or not )....
on the back of the oil pump... there is a pressure relief valve.
As with most things on these MB's .. they were changed over the years.. hopefully improving or tweaking them... and it is possible for that valve to fall out of the oil pump... or have the wrong pressure setting and it cause noise in the engine... This may or may not apply to a 617... but if you have the pan off it is something on an old engine to check.
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