Concur, it sounds like a tensioner issue. If the dry tapping continues longer than a few moments I would also consider replacing the oil drip tube plastic bits and making sure the drip holes are clean and free of any blockage.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.