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

Accessory Drive

The accessory drive:

- has a single serpentine drive belt with 6 ribs.
- has automatic tensioning.
- is not adjustable.

The accessory drive system provides power to operate components which power other systems. The accessory drive system provides power to operate the coolant pump. The coolant pump is equipped with a pulley which is driven by the accessory drive belt. The accessory drive belt is driven by the engine crankshaft pulley. 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 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 properly aligned and kept clean.

Accessory Drive Belt Routing











Belt Tensioner

NOTE: The accessory drive belt tensioner must be replaced as a complete unit.

Automatic tensioners are calibrated to provide the correct amount of tension to the belt for a given accessory drive system. Unless a spring or damping band within the tensioner assembly breaks, or some other mechanical part of the tensioner fails, there is no need to check the tensioner for correct tension.