As a matter of routine, every time I buy a VW diesel I replace the timing belt ASAP. You never know how competent the previous owner or their mechanic were, and the failure is catastrophic.It also gives you a chance to inspect the pulley and set the timing properly.It may not be bad, I had one a few years ago that was just worn a bit on the keyway, so I pinned it into place with two well positioned drill bits and some liberal application of JB Weld. Still good 20,000k later. My father did one years back and it's still on the road as well, so you may not need to pull the crankshaft even if there is some damage.I can hear some of the purists cringing from here . It's ghetto, but it works.