Mercedes® Accessory Belt Idler Pulley, Grooved, 2007-2013

Quality Replacement Part Meets Or Exceeds OE Specifications Includes NTN/NSK Bearing You may need to replace the pulley if there is play in the bearing, the pulley is out of alignment, or the pulley is squealing(because the bearings are bad). It is crucial that the proper tension is maintained and any worn parts be replaced immediately to prevent a breakdown or possible engine damage.