ACDelco 12563084 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 87 Oldsmobile Firenza, 88-96 Buick Regal, 88-97 Oldsmobile Cutlass Supreme, 88-03 Pontiac Grand Prix, 90-96 Chevrolet Beretta, 90-94 Chevrolet Cavalier, 90 Chevrolet Celebrity, 90-96 Chevrolet Corsica, 90-01 Chevrolet Lumina, 90-96 Chevrolet Lumina APV, 90-94 Oldsmobile Silhouette, 90-91 Pontiac 6000, 90-98 Pontiac Trans Sport, 96-98 Oldsmobile Silhouette, 91-94 Pontiac Sunbird, 94-05 Buick Century, 94-98 Buick Skylark, 94-98 Oldsmobile Achieva, 94-96 Oldsmobile Cutlass Ciera, 94-98 Pontiac Grand Am, 95-05 Chevrolet Monte Carlo, 97-98 Chevrolet Venture, 00-05 Chevrolet Impala

Special Price $95.16 Regular Price $105.73
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Estimated Ship Date: 1 Business Day or Less
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;Oldsmobile;Pontiac
  • 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)46
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)4.75
Mount Hole Diameter (in)0.409 in
Mount Hole Diameter (mm)10.4 mm
Mount Hole Quantity1
Programming RequiredNo
Pulley Center Bore Diameter (in)0.394 in
Pulley Center Bore Diameter (mm)10 mm
Pulley Outside Diameter (in)3.5
Pulley Width (in)1.264 in
Pulley Width (mm)32.1 mm
Weight (lb)2.06



  • 1988-1996 Buick Regal
  • 1997-1998 Chevrolet Venture
  • 1990-1994 Oldsmobile Silhouette
  • 1994-1998 Buick Skylark
  • 1990-1998 Pontiac Trans Sport
  • 1990-1996 Chevrolet Lumina APV
  • 1988-1997 Oldsmobile Cutlass Supreme
  • 1995-2005 Chevrolet Monte Carlo
  • 2000-2005 Chevrolet Impala
  • 1990-2001 Chevrolet Lumina
  • 1994-1996 Oldsmobile Cutlass Ciera
  • 1994-1998 Oldsmobile Achieva
  • 1990-1990 Chevrolet Celebrity - Position: Accessory Drive
  • 1990-1994 Chevrolet Cavalier
  • 1990-1996 Chevrolet Corsica
  • 1994-2005 Buick Century
  • 1990-1990 Pontiac 6000 - Position: Accessory Drive
  • 1996-1998 Oldsmobile Silhouette
  • 1988-2003 Pontiac Grand Prix
  • 1991-1991 Pontiac 6000
  • 1994-1998 Pontiac Grand Am
  • 1991-1994 Pontiac Sunbird
  • 1987-1987 Oldsmobile Firenza - Position: Accessory Drive
  • 1990-1996 Chevrolet Beretta
Customer Questions
Does AC Delco make Ford parts?
No, AC Delco produces parts primarily for General Motors vehicles and does not make parts specifically for Ford vehicles.
Can I use AC Delco parts to replace OEM parts?
Yes, in most cases AC Delco parts can be used as a replacement for OEM parts. However, it's important to ensure that the parts are compatible with your specific make and model of vehicle.
What AC Delco oil filter do I need?
AC Delco offers a variety of oil filters that are compatible with different makes and models of vehicles. To determine which AC Delco oil filter you need, consult your vehicle's owner's manual or use our online filter lookup tool that matches the make, model, and year of your vehicle.
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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