2012 Peterbilt 320 Engine: 8.9L L6 DIESEL;. 2013 Peterbilt 320 Engine: 8.9L L6 CNG; Position: Fan;. 2013 Peterbilt 320 Engine: 8.9L L6 DIESEL;. Part Type: Accessory Drive Belt Tensioner Assembly. FleetRunner Heavy-Duty Automatic Belt Drive Tensioner.
