Dayco Automatic Belt Tensioner APV3179 Gold They should be changed whenever

They should be changed whenever the pads are replaced or when the vehicle's warning light indicates

Outside Diameter: 63mm

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Dayco Automatic Belt Tensioner APV3179 Gold They should be changed wheneverDayco No Slack Automatic Belt Tensioner is designed to maintain constant tension on serpentine belt drives. The serpentine belt drives consist of a single belt that powers most, if not all, of the engine's accessories. To maintain the proper tension throughout the drive, an automatic, spring loaded tensioner is incorporated into the drive system geometry. Dayco's Automatic Belt Tensioner features a patented "flat spring" design that's engineered to