Mercedes® Drive Belt Tensioner - With Pulley (201/124/126/129/140/202)

Single poly-ribbed drive belts are dependent on the belt tensioner and belt tensioner adjustment rods to keep the belt aligned and properly tensioned. Since this single belt drives all the engine accessories, alternator, and coolant pump, it is crucial the proper tension is maintained and any worn parts be replaced immediately to prevent a breakdown or possible engine damage.