Dayco 89421 - GOLD Label No Slack Heavy Duty Automatic Belt Tensioner Assembly

GOLD Label No Slack Heavy Duty Automatic Belt Tensioner Assembly (89421) by Dayco. Constructed for heavy duty diesel engine accessory drive applications, this product handles the higher torque and power pulses exerted by diesel engines better than comparable automatic belt tensioners. With a unique heavy duty cast aluminum body and pulley arms, it provides exceptional durability, while its rugged pulleys with dual permanently lubricated bearings ensure lasting performance.