A collapsed ball stud or a worn rocker or cam can may a very loud and distinctive tapping or knocking noise that varies with RPM. Do a search on "ball stud" - lots of info available. IMHE, a loose chain is more of a steady rattle. Neither is a good noise.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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