is it possible to adjust the valves on a 1.9 tdi? i think when the oil line origionally broke the timing was slightly altered, i checked out the timing belt and it looks about time to replace and the rcords on the car show it was done about 40,000 mi. ago. if so is this an easy task? i know these cars run great when they work properly and as it runs now it sounds like the valve timing is off. thanks, justin