Monitoring the Serpentine Belts
Two poly-V-belts (8 and 9) are used on the engine for On-Highway Vehicle applications. One belt drives the fan hub and the other belt drives the remaining accessories. To provide proper running tension, the system utilizes an automatic tensioning device. Automatic belt tensioners require no adjustment.
Replacement of Belts
DD Platform engines utilize a specially designed EPDM belt material which is exclusive to the OE component. Replacement with an aftermarket part may lead to shortened maintenance intervals and excessive noise.
If the vehicle is operated in severely cold/hot temperatures, or is exposed to significant dust/debris/road salt, the belts may require replacement prior to mileage specified in the maintenance interval section.