Everytime you use the engine, the timing chain will be used. It connects the crankshaft to the camshaft. The metal links in the chain move on the tooth sprockets on the end of the crankshaft and crankshaft so that they rotate together. The timing chain normally needs to be replaced between 40,000 and 100,000 miles unless there is a problem.
1 Verify condition by observing engine sound during cold start. 2. If the rattling noise comes from the area of the timing chains (back of the engine) for 1-3 seconds after the first start of the day, replace both upper chain tensioners of bank 1 and bank 2 with the optimized chain tensioners.. #2. My 2005 3.0 Tdi SE quattro - engine type BMK does not have a cambelt, but at 70K miles it needed its diesel timing belt an tensioner changing, apparently this is not a cam belt (as the car has a chain for that). BestDonationlink: A4 A5 A6 A7 Q7 Q5 C7 3.0TDI timing chain replacementVW touareg, phaeton, amar 2 High Oil Consumption @ 96,000 miles (new pistons and rings paid by Audi - result!) 3) This week I've had a major failure. The timing chain tensioner has failed (a £33.60 part - pics attached for interest) causing £4.4K . 145 192 246 13 320 285 17 185 381