engine clank which cause engine damper to jump
 

Greetings from Ireland!! My luck with second hand mercedes cars has gone from bad to worse..hence the name deflated!!. My first Merc was a 1992 300D which had automatic gearbox failure (twice), and i will not even mention the list of problems that i had with my next car (same model).My most recent buy is a 1998 E300D Turbo, which seemed to be in good mechanical order at the time of buying, but has decided to develope an engine clank every 10-12 secs approx. Even though the engine is running at idle speed, the clank causes the engine damper bar to compress slightly and release. Any ideas???