I have a 2003 1.9 TDI with 145K on the the clock. I have just returned from a trip to Cornwall and noticed that on tick over there was a horrible sounding rattle coming from the engine. When I investigated I noticed that one of the pulleys or tensions for the cam belt is moving slightly back and forwards. I immediately panicked and turned the engine off. I am just wondering is there a way that you can tighten this back up, or as its an important component should I just have it replaced along with the cam belt at the same time, as I presume the cam belt would have to be removed anyway to replace it. Any suggestions would be much appreciated. Also I thought I should mention that I only bought this car a few weeks ago from a dealer with 3 months warranty, so would this be covered by the warranty? I have taken some photos below to help describe what I am trying to explain.