Dayco 2pc Tensioner Left Split

Dayco introduces 2-piece tensioner for DD engines

March 31, 2022
The tensioner is designed to help address repair issues for Detroit Diesel 13 and 15 series engines, cutting installation time in half to help ensure fleet uptime

Aftermarket supplier Dayco’s heavy-duty 2-piece tensioner is stocked and ready for customer orders—that’s despite industry-wide supply chain challenges, the company announced at HDAW.

The tensioner, designed to help address repair issues for Detroit Diesel 13 and 15 series engines, cuts installation time in half and helps ensure fleet uptime, according to the supplier. In addition, Dayco’s technical team has developed a step-by-step installation video and 1-page technical guide to ensure today’s technicians have the information needed for a quick and successful installation.  

“This particular tensioner was engineered to be more durable and much easier to install than the original equipment,” said Jay Buckley, Director of Product Management, Dayco North American Aftermarket. “With the original tensioner, techs are required to bend an 8-rib belt sideways through a narrow opening during replacement, which can lead to belt issues if not done carefully. We’ve addressed this issue and in doing so, cut installation time significantly.” 

Part number 89947 covers more than 600,000 2008-2020 Freightliner, Kimble Chassis, Pierce Mfg. Inc., Sterling Truck, Van Hool and Western Star vehicle applications. With this new design, instead of struggling to get the belt on a 1-piece tensioner, Dayco split the system in two, so the product has an outer and inner tensioner, the company noted. Cutting installation time in half compared to traditional 1-piece tensioners will help save hundreds of hours and dollars for fleet managers.  

To place an order for the 2-piece tensioner, distributors should contact their Dayco heavy-duty sales representative. For additional product information, technicians and fleet owners should visit