ACDelco 12573024 Accessory Drive Belt Tensioner Assembly

Drive Belt Tensioner

Fits: 02-09 Chevrolet Trailblazer, 02-06 Chevrolet Trailblazer EXT, 02-09 GMC Envoy, 02-06 GMC Envoy XL, 02-04 Oldsmobile Bravada, 03-08 Isuzu Ascender, 04-07 Buick Rainier, 04-05 GMC Envoy XUV, 05-12 Chevrolet Colorado, 05-12 GMC Canyon, 05-09 Saab 9-7x, 06-10 Hummer H3, 06 Isuzu i-280, 07-08 Isuzu i-290, 07-08 Isuzu i-370, 09-10 Hummer H3T

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ACDelco GM Original Equipment Drive Belt Tensioner Assemblies are spring-loaded pulleys designed to draw tension on your vehicle's serpentine belt, and are GM-recommended replacements for your vehicle's original components. These original equipment drive belt tensioner assemblies have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. ? WARNING: Cancer and Reproductive Harm -



  • Buick;Chevrolet;GMC;Hummer;Isuzu;Oldsmobile;Saab
  • GM-recommended replacement part for your GM vehicle's original factory component
  • Helps keep drive belt at correct tension to help maintain proper function
  • Manufactured to GM OE specification for fit, form, and function
  • Offering the quality, reliability, and durability of GM OE


Belt TypeSerpentine
Degree Range Of Adjustment (deg)48
FAQ - Answer 1Yes. If the drive belt is too tight, damage to other drive components may occur.
FAQ - Question 1Can a drive belt be too tight?
Good Maintenance Practices - Section 1 - Bullet 1Before purchasing and installing a drive belt tensioner assembly, make sure it is the correct size and fit for your vehicle.
Good Maintenance Practices - Section 1 - Bullet 2Be sure to have the replacement tensioner properly aligned to the other drive component pulleys.
Good Maintenance Practices - Section 1 - Bullet 3Have your vehicle inspected as soon as possible if the 'Service Engine Soon' light illuminates.
Good Maintenance Practices - Section 1 - Bullet 4Have your vehicle inspected immediately if the 'Service Engine Soon' light flashes rapidly, as this could indicate an engine misfire condition which may damage your engine and/or engine emission components.
Good Maintenance Practices - Section 1 - Bullet 5Regularly inspect assembly for signs of damage or wear, and replace them if signs of damage are found.
Height (in)2.4
Mount Hole Diameter (in)0.411 in
Mount Hole Diameter (mm)10.45 mm
Mount Hole Quantity1
Programming RequiredNo
Pulley Center Bore Diameter (in)0.315 in
Pulley Center Bore Diameter (mm)8 mm
Pulley Outside Diameter (in)2.7
Pulley Width (in)1.231 in
Pulley Width (mm)31.26 mm
Weight (lb)1.81




  • 2006-2006 Isuzu i-280
  • 2003-2008 Isuzu Ascender
  • 2002-2006 Chevrolet Trailblazer EXT
  • 2004-2005 GMC Envoy XUV
  • 2007-2008 Isuzu i-290
  • 2002-2009 GMC Envoy
  • 2004-2007 Buick Rainier
  • 2006-2010 Hummer H3
  • 2002-2004 Oldsmobile Bravada
  • 2002-2009 Chevrolet Trailblazer
  • 2005-2009 Saab 9-7x
  • 2005-2012 Chevrolet Colorado
  • 2007-2008 Isuzu i-370
  • 2009-2010 Hummer H3T
  • 2005-2012 GMC Canyon
  • 2002-2006 GMC Envoy XL
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