Spannvorrichtung für Zahnriemen beim PD | Posts 16+

Dirk,
Thank you for your reply. The car has been standing still for hours, and the clearance was still not back to 4 mm. Your tip about using the idle setting was helpful. After starting the engine, the clearance immediately went above 4 mm. If I have to deal with this again, the problem is that it's very difficult to access that area on a Passat. Either I would have to remove the bumper again and put the lower control arm in the service position, or 'fiddle around' and tighten the tensioner without using a torque wrench.
So, I'm going to wait and see for now.
Best regards,

Hardy.

ulf wrote:

However, the belt does not shorten; instead, the block grows more than the belt, which causes the tensioner to move towards its limit when the engine is hot.

Assuming a length of 400 mm for the cast iron block and 100 mm for the aluminum head, the change in length at a temperature increase of 100 degrees Celsius would be approximately 0.66 mm: (400 mm * 10.5E-6 + 100 mm * 23.8E-6) * 100. This is equivalent to a shortening of the timing belt by 1.32 mm.

More than I expected.

Best regards,
Christian.