Accessory Drive: Introduction: Notes

The accessory drive is a belt system powered by a pulley attached to the front of the crankshaft. The crankshaft pulley, which incorporates a torsional vibration damper, drives primary and secondary drive belts. An automatic belt tensioner in the primary belt run maintains the drive belt at the correct tension. Together with idler pulleys, the belt tensioner also guides the primary drive belt clear of obstructions and sets the correct 'wrap-around' of the accessory component drive pulleys to ensure a slip-free drive.