Hello there! I'm Eurocar ! I will try to assist you as much as I can.
there have been issues with the timing belt tensioner roller making noise . does the noise come from behind the timing cover. an automotive stethoscope will help out tremendously to pinpoint.
if that is the case recommend to get the timing belt kit from an audi dealer with a water pump and perform the job correctly.
the reason why the water pump also is that the timing belt runs the pump. hate to do the job twice and pay double to get to the same area
describe the noise to me please . to make sure we are dealing the same noise.
does your pulley look like that above. note the cap it may be on the end. does it have this black cap?
so it has splines in the center right?
and around the brown section of it does it look rusty brown?
i you have the same pulley that pulley should slip one way and the other way it should lock and turn so if the pulley does not slip and if you turn both ways and feels locked the pulley is bad. that slippage prevents the tensioner to bob and make noise due to the undulations of rotational force.
just checking in on the progress . if everything is ok please leave "excellent service" feedback for the help given