Product Details: The Dayco 2-Piece Belt Tensioner ensures you are Ready for the Road Ahead™, being engineering to meticulous design specifications with an outer and inner tensioner that cuts installation time by 50%. Signs or symptoms of a bad belt tensioner are squeaky or grinding sounds coming from the belt. This heavy duty serpentine belt tensioner assembly replacement boasts a patented construction that can handle the higher torque and power pulses from today’s diesel engines, resisting wear in both extreme temperatures and under harsh environments. FleetPride is your First Click in Heavy Duty®.