Dayco 89491 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 92-94 Ford F700, 96-97 Ford F700, 93-94 Ford F800, 96-99 Ford F800, 96-98 Ford F800 LPO, 07 Blue Bird All American FE

Special Price $71.39 Regular Price $83.99
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Dayco® No Slack® Automatic Belt Tensioners are built to outperform and outlast competitive OE parts. This specific Dayco® Automatic Belt Tensioner is 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 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 Pulleys1
Pulley 1 Diameter78
Pulley 1 FlatY
Pulley 1 Width32.7



  • Freshstart: 49505
  • Goodyear: 49505
  • Litens: 910016
  • Cummins: 3912254
  • Dynacraft: D1186-2367
  • Duralast: 89491


  • 1993-1994 Ford F800 - Position: Fan and Alternator
  • 1996-1998 Ford F800 LPO - Position: Fan and Alternator
  • 2007-2007 Blue Bird All American FE - Position: Main Drive
  • 1992-1994 Ford F700 - Position: Fan and Alternator
  • 1996-1999 Ford F800 - Position: Fan and Alternator
  • 1996-1997 Ford F700 - Position: Fan and Alternator
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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