THERE ARE TWO ENGINE TIMING CHAIN TYPES FOR THE 2009-2013 MAZDA6 3.7L. 1. ROLLER TYPE TIMING CHAIN IS USED ON THE 2009-2011 BUILT BEFORE DECEMBER 14, 2010. 2. SILENT TYPE TIMING CHAIN IS USED ON THE 2011-2013 BUILT AFTER DECEMBER 14, 2010. WORKSHOP MANUAL TIMING CHAIN REMOVAL/INSTALLATION [MZI 3.7 V6] HAS BEEN REVISED WITH CORRECTED PROCEDURES.
