Dayco 89266 Accessory Drive Belt Tensioner Assembly - Main Drive
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Dayco

Dayco 89266 Accessory Drive Belt Tensioner Assembly - Main Drive

Brand Dayco 89266
Position Main Drive
Belt Type Serpentine
Direction Counter Clock Wise
Number of Pulleys 1
Pulley 1 Diameter 76
Pulley 1 Flat Y
Pulley 1 Width 31
Type Automatic
Fits Buick, Cadillac, Pontiac, and Oldsmobile · 57 vehicles

Automatic tensioner. Maintains proper belt tension for consistent accessory drive performance.

Serpentine belt compatible. Built for serpentine belt systems with a single pulley design.

Single-pulley design. Uses one pulley for a straightforward accessory drive setup.

Cross-references ACDelco 38153, CARQUEST 38153 and Dorman 419-117 for the same application. See all 14.

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Not what you need? See all Accessory Drive Belt Tensioner Assembly options

Accessory Drive Belt Tensioner for GM V6 Applications

This Dayco accessory drive belt tensioner assembly is built for serpentine belt systems that use an automatic tensioner with a counter clockwise rotation. It is a direct-fit service part for select Buick, Cadillac, Oldsmobile, and Pontiac applications, including the Cadillac DeVille, Cadillac Seville, and Buick Lucerne.

Key Features

  • Brand: Dayco
  • Part number: 89266
  • Accessory drive belt tensioner assembly for serpentine belt systems
  • Automatic tensioner design for consistent belt load
  • Counter clockwise rotation
  • Single pulley design
  • Pulley diameter: 76 mm
  • Flat pulley surface: Yes
  • Pulley width: 31 mm

Detailed Description

Dayco 89266 is an accessory drive belt tensioner assembly engineered for vehicles that use a serpentine belt and an automatic tensioning system. The unit features one pulley with a 76 mm diameter and 31 mm width, along with a flat pulley profile for proper belt tracking in the accessory drive system. This part number is listed for Main Drive applications across multiple GM platforms, including 1993-2004 Cadillac Seville, 1993-2002 Cadillac Eldorado, 1994-2005 Cadillac DeVille, 2006-2011 Cadillac DTS, and 2006-2011 Buick Lucerne.

This part cross-references Gates 38153 for the same application.

What It Helps Address

  • Serpentine belt slack or inconsistent belt tension
  • Belt squeal caused by weak or worn tensioner components
  • Belt tracking issues related to pulley wear
  • Accessory drive noise from a failing automatic tensioner
  • Reduced belt control in the main drive system

Installation Notes and Tips

Verify belt routing, pulley alignment, and rotation direction before installation. Confirm the vehicle uses a counter clockwise automatic tensioner in the main drive position, and compare the existing pulley diameter and width to the replacement part. For best results, inspect the serpentine belt and adjacent pulleys for wear before returning the vehicle to service.

Quality Assurance

Dayco is a recognized supplier in the accessory drive belt system category, and this tensioner assembly is built to match the listed OE-style application requirements for proper fitment on confirmed vehicles.

Related reading

This part fits 57 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2011BuickLucerne4.6LV8Main Drive—
2011CadillacDTS——Main Drive—
2010BuickLucerne4.6LV8Main Drive—
2010CadillacDTS——Main Drive—
2009BuickLucerne4.6LV8Main Drive—
2009CadillacDTS——Main Drive—
2008BuickLucerne4.6LV8Main Drive—
2008CadillacDTS——Main Drive—
2007BuickLucerne4.6LV8Main Drive—
2007CadillacDTS——Main Drive—
2006BuickLucerne4.6LV8Main Drive—
2006CadillacDTS——Main Drive—
2005CadillacDeVille——Main Drive—
2005PontiacBonneville4.6LV8Main Drive—
2004CadillacDeVille——Main Drive—
2004CadillacSeville——Main Drive—
2004PontiacBonneville4.6LV8Main Drive—
2003CadillacDeVille——Main Drive—
2003CadillacSeville——Main Drive—
2003OldsmobileAurora——Main Drive—
2002CadillacDeVille——Main Drive—
2002CadillacEldorado——Main Drive—
2002CadillacSeville——Main Drive—
2002OldsmobileAurora4.0LV8Main Drive—
2001CadillacDeVille——Main Drive—
2001CadillacEldorado——Main Drive—
2001CadillacSeville——Main Drive—
2001OldsmobileAurora4.0LV8Main Drive—
2000CadillacDeVille——Main Drive—
2000CadillacEldorado——Main Drive—
2000CadillacSeville——Main Drive—
1999CadillacDeVille——Main Drive—
1999CadillacEldorado——Main Drive—
1999CadillacSeville——Main Drive—
1999OldsmobileAurora——Main Drive—
1998CadillacDeVille——Main Drive—
1998CadillacEldorado——Main Drive—
1998CadillacSeville——Main Drive—
1998OldsmobileAurora——Main Drive—
1997CadillacDeVille——Main Drive—
1997CadillacEldorado——Main Drive—
1997CadillacSeville——Main Drive—
1997OldsmobileAurora——Main Drive—
1996CadillacDeVille——Main Drive—
1996CadillacEldorado——Main Drive—
1996CadillacSeville——Main Drive—
1996OldsmobileAurora——Main Drive—
1995CadillacDeVille4.6LV8Main Drive—
1995CadillacEldorado——Main Drive—
1995CadillacSeville——Main Drive—
1995OldsmobileAurora——Main Drive—
1994CadillacDeVille4.6LV8Main Drive—
1994CadillacEldorado——Main Drive—
1994CadillacSeville——Main Drive—
1993CadillacAllante——Main Drive—
1993CadillacEldorado4.6LV8Main Drive—
1993CadillacSeville4.6LV8Main Drive—
Directly replaces or cross-references 14 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 38153CARQUEST — 38153Dorman — 419-117Duralast — 305266Four Seasons — 45847Freshstart — 49240Gates — 38153General Motors — 3531801General Motors — 3540047General Motors — 12557838General Motors — 12562347Goodyear — 49240Hayden — 5847NAPA — 38153