Dayco 89399 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 06 BMW 325i, 06 BMW 325xi, 06 BMW 330i, 06 BMW 330xi, 06-07 BMW 525i, 06-07 BMW 525xi, 06-07 BMW 530i, 06-07 BMW 530xi, 06-11 BMW Z4, 07-13 BMW 328i, 07-08 BMW 328xi, 07-10 BMW X3, 08-13 BMW 128i, 08-11 BMW 323i, 08-10 BMW 528i, 08 BMW 528xi, 09-13 BMW 328i xDrive, 09-10 BMW 528i xDrive

Special Price $83.29 Regular Price $97.99
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Estimated Ship Date: 1 Business Day or Less
Dayco® No Slack® Automatic Belt Tensioners are built to outperform and outlast competitive OE parts. The heavy duty cast aluminum spring case resists cracking and fatigue. Each component is built to resist rust, endure the toughest of conditions while promoting quieter performance and longer life.

BRAND: Dayco




Belt TypeSerpentine
DirectionCounter Clock Wise
Number of Pulleys1
Pulley 1 Diameter70
Pulley 1 FlatY
Pulley 1 Width26



  • NAPA: 39112
  • BMW:
  • ACDelco: 39112
  • Gates: 39112
  • CARQUEST: 39112
  • Duralast: 305399


  • 2007-2010 BMW X3
  • 2006-2006 BMW 325xi
  • 2006-2006 BMW 325i
  • 2009-2010 BMW 528i xDrive
  • 2006-2007 BMW 525xi
  • 2008-2010 BMW 528i
  • 2006-2007 BMW 530i
  • 2007-2008 BMW 328xi
  • 2006-2011 BMW Z4
  • 2009-2013 BMW 328i xDrive
  • 2008-2011 BMW 323i
  • 2006-2006 BMW 330xi
  • 2007-2013 BMW 328i
  • 2008-2008 BMW 528xi
  • 2006-2006 BMW 330i
  • 2008-2013 BMW 128i
  • 2006-2007 BMW 525i
  • 2006-2007 BMW 530xi
Customer Questions
Can a serpentine belt cause smoke?
Yes, a serpentine belt can cause smoke. A serpentine belt is an essential component of a vehicle's engine system. It drives various accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. If the serpentine belt becomes worn, damaged, or misaligned, it can cause friction and generate smoke.
Why is my serpentine belt squealing?
The serpentine belt can squeal due to various reasons, including tension issues, worn-out belt, or a problem with the belt's pulleys.
Is my serpentine belt too tight?
If your serpentine belt is causing issues like excessive noise or accelerated wear on the pulleys, it may indicate that the belt is too tight.
Why did my serpentine belt come off?
Serpentine belts can come off due to factors such as belt wear, improper tension, misaligned pulleys, or a faulty tensioner.
Please, mind that only logged in users can submit questions

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