Engine Pulleys & Components

Most drivers know that the drive belts can be the cause of poor accessory performance and noise, but what many don’t realize is that the pulleys that contact the belt can often be the underlying cause of these malfunctions. Modern serpentine belts are part of a sophisticated accessory drive system, and each part of that system must work properly in order for the accessories to deliver peak performance and quiet operation.

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    • (0 reviews)
      # sp9399
      Belt Tensioner by Dorman®. Rigorously tested for a sustained, secure performance by a team of product and quality engineers, Dorman’s Automatic Belt Tensioner Assembly is designed to provide proper tension to a vehicle’s serpentine...
      Quality tests on this part include torque testing, spring-back testing, corrosion-resistance testing, and on-vehicle testingSolid steel or aluminum construction for long-lasting durability
      $50.81 - $73.11
    • (0 reviews)
      # sp136444
      Drive Belt Idler Assembly by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $42.69
    • (0 reviews)
      # sp136446
      Drive Belt Tensioner by Dorman®. Rigorously tested for a sustained, secure performance by a team of product and quality engineers, Dorman’s Automatic Belt Tensioner Assembly is designed to provide proper tension to a vehicle’s...
      Quality tests on this part include torque testing, spring-back testing, corrosion-resistance testing, and on-vehicle testingSolid steel or aluminum construction for long-lasting durability
      $45.34 - $48.74
    • (0 reviews)
      # sp136447
      Drive Belt Tensioner Pulley by Dorman®. Rigorously tested for a sustained, secure performance by a team of product and quality engineers, Dorman’s Automatic Belt Tensioner Assembly is designed to provide proper tension to a...
      Quality tests on this part include torque testing, spring-back testing, corrosion-resistance testing, and on-vehicle testingSolid steel or aluminum construction for long-lasting durability
      $58.17
    • (0 reviews)
      # sp6281
      Idler Pulley by Dorman®. Dorman’s Idler Belt Pulleys are engineered to effectively route the serpentine belt for proper alignment with the accessory drive belt, thereby keeping the alternator charging, the water pump running, and the...
      High quality construction for long-lasting durability against heat, shock and corrosionReplacement stops squeak, squeal or groaning noise associated with a worn idler pulley
      $16.47
    • (0 reviews)
      # sp136451
      OE Solutions™ Crankshaft Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $24.95 - $462.97
    • (0 reviews)
      # mpn4524591727
      OE Solutions™ Harmonic Balancer Pulley by Dorman®. Maintain the correct level of tension on your timing belt with Dorman’s Engine Timing Belt Tensioner. Since this part is essential to the precisely timed operation of your engine,...
      Solid steel construction for long-lasting durabilityHelps keep engine functioning properly
      $22.95
    • (0 reviews)
      # mpn2337589
      TECHoice™ 4 Grooves Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $77.32
    • (0 reviews)
      # mpn4208039980
      TECHoice™ 4 Grooves Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $16.37
    • (0 reviews)
      # mpn2337589
      TECHoice™ 4 Grooves Steel Idler Pulley by Dorman®. Location: A/C Belt. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $77.32
    • (0 reviews)
      # mpn2337589
      TECHoice™ 4 Grooves Steel Idler Pulley by Dorman®. Location: Power Steering. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $77.32
    • (0 reviews)
      # mpn2337941
      TECHoice™ 4 Grooves Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $18.12
    • (0 reviews)
      # mpn4207966359
      TECHoice™ 6 Grooves Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $7.74
    • (0 reviews)
      # mpn4480238605
      TECHoice™ 7 Grooves Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.69
    • (0 reviews)
      # sp136467
      TECHoice™ Drive Belt Tensioner by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $57.50
    • (3 reviews)
      # sp136468
      TECHoice™ Drive Belt Tensioner Assembly by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $17.50 - $132.17
    • (0 reviews)
      # mpn2335595
      TECHoice™ Driver Side Smooth Regular Type Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $11.27
    • (0 reviews)
      # mpn4207979334
      TECHoice™ Grooved Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $18.15
    • (0 reviews)
      # mpn4207993017
      TECHoice™ Grooved Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.05
    • (0 reviews)
      # mpn4496905821
      TECHoice™ Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $19.44
    • (0 reviews)
      # mpn697793648
      TECHoice™ Lower Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.25
    • (0 reviews)
      # mpn2335598
      TECHoice™ Lower Smooth Steel Idler Pulley by Dorman®. Water Pump Mounted. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $8.01
    • (0 reviews)
      # mpn2335595
      TECHoice™ Passenger Side Smooth Regular Type Steel Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $11.27
    • (0 reviews)
      # mpn4208016640
      TECHoice™ Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $18.42
    • (0 reviews)
      # mpn697793648
      TECHoice™ Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.25
    • (0 reviews)
      # mpn697793648
      TECHoice™ Plastic Idler Pulley by Dorman®. Location: Smooth Pulley. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.25
    • (0 reviews)
      # mpn4208016640
      TECHoice™ Plastic Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $18.42
    • (0 reviews)
      # mpn4208005386
      TECHoice™ Polyamide 6.6 with 30% Glass Fiber Fill Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $22.37
    • (0 reviews)
      # mpn4208081325
      TECHoice™ Polyamide 6.6 with 30% Glass Fiber Fill Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $18.00
    • (0 reviews)
      # mpn2443159
      TECHoice™ Polyamide 6.6 with 30% Glass Fiber Fill Idler Pulley by Dorman®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $9.27




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    In a typical serpentine belt accessory drive system there is a drive pulley that is part of or attached to the crankshaft mounted harmonic balancer, a pulley at each of the belt-driven accessories, a belt tensioner and one or more idler pulleys. The rubber ring between the hub and inertia ring on the harmonic balancer can fail and these components are discussed more in depth on our Harmonic Balancers product page.

    The pulleys that directly affect belt adjustment and noise are the tensioner and idler pulleys. A worn tensioner will cause the belt to slip and reduce accessory efficiency. For example, alternator charging output may be reduced which may wear the battery down. Your vehicle may not start and the CHECK ENGINE light may illuminate. Slippage will also wear the belt and cause a squealing noise, as well as generate heat that will reduce the life of accessory pulley bearings. Many tensioners also include a dampening mechanism to control vibration. A worn damper will allow belt slap, which can also cause pulley bearings to fail.

    Pulley misalignment can cause belt chirp. Worn tensioner and idler pulleys can cause misalignment, which can also create excessive heat that wears the belt and the pulley bearings. Spraying water on the rib side of a serpentine belt can help determine whether a noise is a chirp or squeal. If the noise temporarily subsides, it’s a chirp caused by misalignment. If it gets louder, it’s a squeal caused by reduced belt tension. But you won’t have to make such distinctions if you replace the automatic tensioner and idler pulley(s) along with the serpentine belt - our accessory drive belt kits provide everything needed.

    During deceleration, the spinning alternator creates drag, creating strain on the serpentine belt and tensioner. Many manufacturers use alternator decoupler pulleys, which allow the alternator to freewheel during deceleration, eliminating strain and increasing belt and tensioner lifespan. There are One-Way Clutch (OWC) and Overrunning Alternator Decoupler (OAD) pulleys. Both function similarly, but the OAD also contains a mechanism to reduce vibration. Many OE dealers do not service these pulleys separately from the alternator, but we have them, along with the installation tools, so you can save money.

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    Engine Pulleys Reviews

    Average rating:  5  5 - 52 reviews
    5 of 5
    As Described and Installed with No Issue
    Not much to say. Installed and it worked like a charm.
    Posted by Stephan Krause (San Rafael, CA) / May 14, 20182006 BMW X3
    Was this review helpful for you? Yes
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