Dayco Automatic Belt Tensioner 89321 EV-Hybrid It contains a unique viscosity

It contains a unique viscosity modifier for stay-in-grade performance for the life of the drain

Equivalent to Ryco RTK249

Width: 47mm

It improves the combustibility of diesel fuel providing increased power

Where high performance stopping is important

Dayco Automatic Belt Tensioner 89321 EV-Hybrid It contains a unique viscosityDayco 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