Dayco 89614 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 07-10 BMW 335i, 07-08 BMW 335xi, 08-10 BMW 135i, 08-10 BMW 535i, 08 BMW 535xi, 09-10 BMW 335i xDrive, 09-10 BMW 535i xDrive, 11 BMW 1 Series M, 11-13 BMW 335is

Special Price $81.59 Regular Price $95.99
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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 Pulleys2
Pulley 1 Diameter70
Pulley 1 FlatY
Pulley 1 Width30
Pulley 2 Diameter70
Pulley 2 FlatY
Pulley 2 Width30



  • ACDelco: 39114
  • Goodyear: 49474
  • BMW:
  • CARQUEST: 39114
  • Gates: 39114
  • NAPA: 39114
  • Duralast: 305614


  • 2008-2008 BMW 535xi
  • 2011-2013 BMW 335is
  • 2008-2010 BMW 535i
  • 2011-2011 BMW 1 Series M
  • 2009-2010 BMW 535i xDrive
  • 2008-2010 BMW 135i
  • 2007-2008 BMW 335xi
  • 2007-2010 BMW 335i
  • 2009-2010 BMW 335i xDrive
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.
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