Hi guys I'm hoping someone here can help me. I'm getting a rattling noise from the engine (C180, 2Litre Petrol, 2001. 111 series engine). The noise is akin to marbles in a can. It only occurs at idle however. I've recorded a 30 second video and put it on youtube. https://www.youtube.com/watch?v=advQJBURBkg Can anyone confirm if this noise is from a worn timing chain? Or maybe the tensioner? Would it make sense for this noise to only occur at idle? Thanks for any help!