Yep 116 engine.
Are you sure it isn't lifter noise?
New oilers might fix that. lso use 15-45 Chevron Delo LE Oil it has higher Zinc content that our engines like.

How about engine mounts, the clacking could be the fan hitting the shroud. Look at the lower passenger side of the shroud to see if there are scrape marks. Engine fan would hit at idle and then go away upon higher RPM due to engine lift.

__________________
1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.