Dayco 89436 Heavy-Duty Automatic Serpentine Belt Tensioner Assembly – Freightliner / Western Star

The Dayco 89436 Heavy-Duty Automatic Belt Tensioner is engineered for demanding commercial truck engine applications. Designed to maintain consistent tension on the serpentine accessory drive belt, this tensioner helps minimize belt slippage, reduce operating noise, and support reliable accessory system performance.

Featuring a heavy-duty cast aluminum housing, a spring-loaded tensioning mechanism, and a single flat pulley, the Dayco 89436 is built to withstand the demands of heavy-duty diesel engine operation. Its design helps reduce tension fluctuations and supports extended service life.

Ideal for select Freightliner, Western Star, and Sterling heavy-duty truck applications, this replacement tensioner provides dependable performance when restoring proper accessory belt operation.

Features and Benefits:

• Genuine Dayco replacement part

• Heavy-duty automatic belt tensioner assembly

• Designed for serpentine belt drive systems

• Single flat pulley configuration

• Counterclockwise tensioner direction

• Durable housing designed for demanding operating conditions

• Helps maintain proper belt tension and reduce belt noise and slippage

• Suitable for select Freightliner, Western Star, and Sterling truck applications

Verify the part number and vehicle application before ordering.

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