Volvo Belt Tensioner

Volvo - 21257889 Belt Tensioner
Engine Applications: Volvo Engine D13, D12D-A, and B11R, B13R, B7R, B9L, B9TL bus engines Function: Maintains proper, consistent tension on the serpentine/accessory belt to prevent slippage, reduce wear, and maintain peak cooling and engine efficiency
Replaces OEM numbers: 21257889, 3979980, 7403979980, 7421257889, and 8149879