VW Touareg V8 serpentine belt tensioner. This original equipment quality tensioner pulley is a cast aluminum assembly. It has the spring loaded tension arm and the idler pulley integrated in one part. Typically if you begin to hear squealing or grinding noises from your engine, the pulley has gone bad. Poor belt tension can also cause your serpentine belt to slip, leading to premature belt failure. If you find that one of these parts is failing the entire assembly must be replaced.
When it is time to replace you VW Touareg serpentine belt tensioner make sure you have the Bentley manual on hand to guide you step-by-step during the installation. Replace your serpentine belt at this time, just in case it was damaged by a dead pulley.