Belt drive Mechanical system Belt routing The ancillary assemblies are driven by a single-piece, low-maintenance poly-V belt. The poly-V belt is tensioned by an automatic belt tensioner with tensioner pulley. Belt routing 1 Alternator 2 Belt pulley 3 Guide pulley 4 Coolant pump 5 Power steering pump 6 Belt tensioner with tensioner pulley 7 Refrigerant compressor 8 Guide pulley 9 Major assembly carrier 19 Introduction of New Generation of 4-Cylinder Inline Engines, OM 651 q – This printout will not be recorded by the update service. Status: 09 / 2008 –