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08-10 Ford 6.4L Powerstroke Dayco Automatic Belt Tensioner - Main Drive

The Dayco 89657 Automatic Belt Tensioner - Main Drive is engineered and manufactured to outlast all other aftermarket belt tensioners on the market. This tensioner has a locator pin to correctly locate the tensioner for precise installation and to withstand the most demanding drive demands. The spring case is manufactured out of sturdy cast aluminum to resist cracking and corrosion while offering better performance and service life. This Belt Tensioner is constructed with a flat wire spring that allows the internal tension to be concentric to deliver constant tension. The patented Deflected Arm Plate decreases arm movement, extending the life of the tensioner by restricting the amount of rotational movement.

  • Meets Or Exceeds OE Specifications
  • Deflected Arm Plate Extends Tensioner Life
  • Heavy-Duty Cast Aluminum Spring Case

Part number: 89657

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