GM GENUINE PARTS Drive Belt Tensioner 12670574 — OE Fit, Spring-Loaded Pulley for GM Vehicles

GM Genuine Parts 12670574 Drive Belt Tensioner is an OE-quality, spring-loaded pulley assembly engineered to maintain correct serpentine belt tension on compatible GM vehicles.

This drive belt tensioner is a factory-backed replacement part from GM GENUINE PARTS, built to the same engineering standards used in vehicle production. It’s intended to restore proper belt tension, reduce belt noise, and support accessory operation by keeping the serpentine belt aligned and taut. The assembly replaces worn or failing tensioners and fits select Chevrolet, Buick, GMC, and Cadillac models where part number 12670574 is specified.

How does the 12670574 tensioner maintain belt performance?

The tensioner uses an internal spring and bearing-supported pulley to apply consistent pressure on the serpentine belt. That steady tension helps accessories — like the alternator, power steering pump, and A/C compressor — run smoothly and reduces premature belt wear.

• Spring-loaded design keeps constant belt tension under varying engine loads
• Precision bearing for smooth pulley rotation
• Reduces slippage, squeal, and uneven belt wear
• Direct-replacement fit for vehicles calling for part 12670574

What are the signs I should replace the tensioner?

You should inspect the tensioner if you hear squealing, notice belt glazing, or experience accessory performance issues. Visible pulley wobble, rust, or a weak return spring are clear indicators that the assembly no longer maintains correct tension and should be replaced.

• Audible belt squeal or chirp on startup or acceleration
• Cracked, frayed, or glazed serpentine belt surface
• Excessive pulley play or visible wobble
• Accessory failures related to belt slip (intermittent charging, power steering noise)

Is this an original equipment (OE) part and how is it tested?

Yes — GM Genuine Parts are designed, engineered, and validated by GM engineers to meet production standards. These parts undergo rigorous testing and quality checks to ensure fit, form, and function for GM vehicles.

• Engineered to GM specifications for fit and durability
• Tested for material strength, spring performance, and bearing life
• Backed by General Motors for service application authenticity
• Some GM Genuine Parts were formerly offered as ACDelco GM Original Equipment (OE)

How do I install or replace the drive belt tensioner?

Replacement typically requires basic hand tools and following the vehicle-specific service manual for belt routing and torque values. Many technicians remove belt tension, unbolt the old assembly, transfer any required hardware, and install the new tensioner, retorquing bolts to specification.

• Relieve belt tension with a wrench or tensioner tool before removal
• Compare new part to old for correct orientation and pulley alignment
• Tighten mounting bolts to manufacturer torque specs
• Verify belt routing and proper tension after installation

Who is this for: The GM Genuine Parts 12670574 Drive Belt Tensioner is intended for owners and technicians working on Chevrolet, Buick, GMC, or Cadillac models that specify this part number. It’s a practical choice for anyone seeking an OE-fit replacement to restore belt tension, reduce noise, and maintain accessory operation using components validated by General Motors. Choose this assembly when you want a direct-replacement, factory-backed tensioner engineered to GM’s current production and service standards.