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Product Details

Dayco Belts, Hoses, Tensioners & Pulleys

Alternator Decoupler Pulley by Dayco®. This application-specific replacement part easily isolates and dampens the drive from the alternator upon deceleration thanks to its one-way clutching capability. The pulley also reduces belt noise and slippage during rapid acceleration or deceleration while improving drive belt tension and prolonging alternator and belt life.



  • Designed to meet your vehicle's requirements
  • One-way clutching capability to isolate and dampen the drive from the alternator upon deceleration
  • Reduces belt slippage during rapid acceleration or deceleration
  • Reduces belt noise
  • Improves drive belt tension
  • Prolongs alternator and drive belt life

Many modern vehicles have an increased amount of accessories that require additional electrical power such as heated and cooled power seats, GPS navigation systems, etc. This is why alternator loads and engine torsional fluctuations are increased. To solve this problem, overrunning alternator decoupler pulleys (OADs) are installed on many late model vehicles. The most common signs of an OAD failure are unusual drive belt noise and vibrations. You may also notice that the alternator doesn't charge the battery and pulley spins in both directions. The pulley can also seize. When it comes to its replacement, choose this Dayco product designed to ensure a precise fit and excellent performance. Thanks to its one-way clutching capability, the product isolates and dampens the drive from the alternator upon deceleration. This pulley also improves drive belt tension, reduces its noise and slippage during rapid acceleration or deceleration thus reducing stress on the drive belt resulting in prolonged alternator and belt service life.

Since 1905, Dayco has been a leader in the automotive parts manufacturing industry. During the early 1900s, Dayco was the first and only company manufacturing the airless tire. By the 1920s, the company had a robust tire manufacturing process in Dayton, Ohio for cars, large trucks and buses. From its founding to today, the company has followed its primary business strategy to anticipate and satisfy all the needs and requirements of its customers by providing innovative, quality, and durable products. Today its wide product line includes belts, tensioners, pulleys and hydraulics equipment for the automotive, construction, trucking, ATV, agricultural, snowmobile, and industrial markets.


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