Dayco 89610 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 96-05 Buick Park Avenue, 96-99 Buick Riviera, 96-03 Pontiac Bonneville, 97-99 Oldsmobile LSS

Special Price $100.79 Regular Price $111.99
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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
DirectionClock Wise
Number of Pulleys2
Pulley 1 Diameter76
Pulley 1 FlatY
Pulley 1 Width31
Pulley 2 Diameter75
Pulley 2 FlatN
Pulley 2 Number of Grooves6
Pulley 2 Width26



  • Duralast: 305610
  • CARQUEST: 38351
  • Gates: 38351
  • Goodyear: 49368
  • General Motors: 12564505
  • NAPA: 38351
  • ACDelco: 38351


  • 1997-1999 Oldsmobile LSS - Position: Supercharger
  • 1996-1999 Buick Riviera - Position: Supercharger
  • 1996-2003 Pontiac Bonneville - Position: Supercharger
  • 1996-2005 Buick Park Avenue - Position: Supercharger
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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