Belt Tensioner
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CARQUEST by Dayco Belt Tensioner

Part No. 89378 Warranty Details  

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Dayco No Slack Automatic Belt Tensioners are specifically built to outperform and outlast competitive OE parts. Each component is built to resist rust, endure the toughest of conditions while promoting quieter performance and longer life.

Product Features:
  • Manufactured with a specially coated patented flat wire spring to allow the internal tension to be concentric, thus providing a more even degree of constant tension
  • The patented Deflected Arm Plate dampens arm movement, prolonging the life of the tensioner by limiting the amount of rotational movement
  • The heavy duty cast aluminum spring case resists cracking and fatigue
  • This tensioner is another Dayco product proudly made in the USA
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Belt Type:Serpentine
Pulley Diameter:76 in
Pulley Material:Steel
Pulley Type:Flat
Pulley Width:38 in


by PowerReviews
CARQUEST by DaycoBelt Tensioner

(based on 1 review)

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Reviewed by 1 customer

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Perfect fit for 2008 Tundra


from Georgia

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3 or more reviews submitted


  • Easy To Install


  • none

Best Uses

  • Everyday Driving
  • Replacement

Comments about CARQUEST by Dayco Belt Tensioner:

Application: 2008 Toyota Tundra (approx 66k miles)
Symptom: Started out as intermittent squeal noise while engine was running. Thought it may be the belt. Became a sustained loud noise.
Solution: Replace belt tensioner. This is a common issue with Tundras from this time period. Also a good time to replaced your belt since it had to be removed easily.
Product: This replacement item looks almost exactly like the original Toyota part. No issues with aligning bolt holes.
Installed for a week now with no issues.

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    tools need to remove and install
    Asked on 10/21/2012 by jim from new jersey

    1 answer



      This Dayco No Slack Automatic Belt Tensioner, Light Duty - part# 89378 is vehicle specific. For assisting you further on installing the belt tensioner, please provide the year, make, model and engine size of the vehicle. You may also visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.

      Answered on 10/22/2012 by Vincent from AAP
  • Q:

    Why is this unit called light duty - do you have a heavy duty tensioner.
    Asked on 3/22/2011 by bob from Acworth, GA

    1 answer



      In order for us to further assist you, would you please provide us with the year, make, model, and engine size of your application?

      Answered on 3/22/2011 by Parts Guru Geo from AAP
Displaying questions 1-2

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