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

Accessory Drive

The accessory drive consists of the following:

- Drive belt
- Idler pulley(s)
- Belt tensioner
- Crankshaft pulley
- A/C clutch pulley
- Generator pulley
- Coolant pump pulley
- Power steering pump pulley

The accessory drive:

- has a single serpentine drive.
- has one idler pulley on the 4.0L SOHC engine.
- has 2 idler pulleys on the 4.6L (3V) engine.
- has automatic tensioning.
- is not adjustable.

The accessory drive system provides power to operate components which power other systems. These could include components such as the generator, power steering pump and A/C compressor. Each of these components is equipped with a pulley which is driven by the accessory drive belt. The accessory drive belt is driven by the engine crankshaft pulley. One or more idler pulleys may be provided to facilitate belt routing and alignment. The automatic belt tensioner maintains correct belt tension and compensates for component wear and changes in system load. System load changes can be caused by the A/C compressor clutch engaging or disengaging, or demand changes on other systems powered by the accessory drive belt. To maintain correct operation of this system, it is critical that the correct length drive belt be installed. The pulleys must also be correctly aligned and kept clean.


Accessory Drive Belt Routing



Front End Accessory Drive (FEAD) - 4.0L SOHC











Front End Accessory Drive (FEAD) - 4.6L (3V)