Drive Belts, Mounts, Brackets and Accessories: Description and Operation

Accessory Drive

COMPONENT LOCATION









INTRODUCTION
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.

Primary Drive Belt
The primary drive belt is a six-ribbed poly-V belt that drives the:
- Coolant pump
- Power steering pump
- A/C (air conditioning) compressor
- Generator.

Secondary Drive Belt
The secondary drive belt is a six-ribbed poly-V belt that drives the pulley of the viscous cooling fan.

Belt Tensioner
The belt tensioner consists of an idler pulley on the end of a spring loaded pivot arm. The pivot arm can be turned for removal and installation of the belt.
The belt tensioner is calibrated to automatically maintain the correct tension in the drive belt.