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

Accessory Drive

COMPONENT LOCATION - NATURALLY ASPIRATED VEHICLES









COMPONENT LOCATION - SUPERCHARGED VEHICLES









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 a single (primary) drive belt on NA (naturally aspirated) vehicles and two (primary and secondary) drive belts on SC (supercharger) vehicles. An automatic belt tensioner in each belt run maintains the drive belt at the correct tension. Together with idler pulleys, the belt tensioner also guides the 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
On both NA and SC (supercharger) vehicles 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
On SC (supercharger) vehicles the secondary drive belt is an eight-ribbed poly-V belt that drives the SC (supercharger).

Belt Tensioners
Each belt tensioner consists of an idler pulley on the end of a spring loaded pivot arm. The pivot arm can be turned clockwise (viewed from the front of the engine) for removal and installation of the belt.
The belt tensioner is calibrated to automatically maintain the correct tension in the related drive belt.