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Product Description
The DORMAN 594-266 Harmonic Balancer Assembly, supplied by Main Street Eshop, is an application-specific direct replacement for select Buick, Chevrolet, Pontiac, and Saturn vehicles equipped with specified 3.4L, 3.5L, or 3.9L V6 engines.
This direct replacement harmonic balancer features a stress-resistant rubber bond designed to properly absorb engine vibration. Stringent specifications and careful construction help provide tensile and impact strength for greater durability.
The DORMAN 594-266 is designed to exactly match the fit and function of the original harmonic balancer for a direct replacement. It has undergone dimensional verification, material validation, and functional testing.
Applications include specified Buick Lucerne, Rendezvous and Terraza; Chevrolet Equinox, Impala, Malibu, Monte Carlo and Uplander; Pontiac G6, Montana and Torrent; and Saturn Aura, Relay and Vue models.
Engine fitment varies significantly by model and year. Please review the detailed application information below rather than selecting this part based only on vehicle model.
Features & Benefits
- Direct Replacement – Designed to exactly match the fit and function of the original harmonic balancer
- Stress-Resistant Rubber Bond – Designed to properly absorb engine vibration
- Durable Construction – Stringent specifications and careful construction help ensure longevity
- Thoroughly Tested – Subjected to dimensional verification, material validation, and functional testing
- Cast Iron Construction – Manufacturer-specified cast iron material
- Serpentine Belt Application – Designed for a serpentine drive belt
- Keyway: Yes
- Degree Markings: No
- Mounting Hardware Included: Yes
- DORMAN Experience – Supported by a team of product experts in the United States and more than a century of automotive experience
Specifications
Brand: DORMAN
Part Number / SKU: 594-266
Product Type: Harmonic Balancer Assembly
Material: Cast Iron
Color: Black
Inside Diameter: 31.8 mm
Outside Diameter: 167 mm
Depth: 40.3 mm
Drive Belt Type: Serpentine
Keyway Type: Yes
Degree Markings: No
Mounting Hardware Included: Yes
Bolt and Washer Included: No
Center Bolt Included: No
Package Contents: 1 Instruction Sheet
Vehicle FitmentBuick Lucerne
Buick Rendezvous
Buick Terraza
- 2005 – V6 3.5L
- 2006 – V6 3.5L or V6 3.9L
- 2007 – V6 3.9L
Chevrolet Equinox
Chevrolet Impala
- 2006-2011 – V6 3.5L or V6 3.9L
Both the 3.5L and 3.9L V6 are specifically listed for every supplied Impala model year from 2006 through 2011.
Chevrolet Malibu
- 2004-2005 – V6 3.5L
- 2006-2007 – V6 3.5L or V6 3.9L
- 2008-2010 – V6 3.5L
The 3.9L application is specifically supplied for 2006-2007 only.
Chevrolet Monte Carlo
- 2006 – V6 3.5L or V6 3.9L
- 2007 – V6 3.5L
Chevrolet Uplander
- 2005 – V6 3.5L
- 2006 – V6 3.5L or V6 3.9L
- 2007-2009 – V6 3.9L
Pontiac G6
- 2005 – V6 3.5L
- 2006-2009 – V6 3.5L or V6 3.9L
- 2010 – V6 3.5L
The 3.9L application is specifically supplied for 2006-2009 and should not be extended to 2005 or 2010.
Pontiac Montana
- 2005 – V6 3.5L
- 2006 – V6 3.5L or V6 3.9L
- 2007-2009 – V6 3.9L
Pontiac Torrent
Saturn Aura
Saturn Relay
- 2005 – V6 3.5L
- 2006 – V6 3.5L or V6 3.9L
- 2007 – V6 3.9L
Saturn Vue
Important Engine & Fitment Information
The DORMAN 594-266 covers multiple V6 engine sizes, but those engine sizes are not interchangeable across every listed vehicle or model year.
3.4L V6 Applications
The supplied 3.4L fitment is limited to:
- 2005-2009 Chevrolet Equinox
- 2006-2009 Pontiac Torrent
3.5L V6 Applications
The supplied 3.5L applications include specified years of:
- Buick Rendezvous
- Buick Terraza
- Chevrolet Impala
- Chevrolet Malibu
- Chevrolet Monte Carlo
- Chevrolet Uplander
- Pontiac G6
- Pontiac Montana
- Saturn Aura
- Saturn Relay
- Saturn Vue
3.9L V6 Applications
The supplied 3.9L applications include specified years of:
- Buick Lucerne
- Buick Terraza
- Chevrolet Impala
- Chevrolet Malibu
- Chevrolet Monte Carlo
- Chevrolet Uplander
- Pontiac G6
- Pontiac Montana
- Saturn Relay
Buyers should verify the exact model year and engine size rather than assuming that all three engine sizes are supported for a particular vehicle.
No additional transmission, drivetrain, trim, or engine-code restrictions were provided in the supplied fitment data.
Harmonic Balancer Dimensions
- Inside Diameter: 31.8 mm
- Outside Diameter: 167 mm
- Depth: 40.3 mm
- Material: Cast Iron
- Drive Belt Type: Serpentine
- Keyway: Yes
- Degree Markings: No
These specifications can be compared with the original component when verifying the correct replacement.
Installation & Hardware Information
According to the supplied DORMAN specifications:
Mounting Hardware Included: Yes
Bolt and Washer Included: No
Center Bolt Included: No
Although mounting hardware is listed as included, the bolt and washer are specifically listed as not included, and the center bolt is also specifically listed as not included.
About DORMAN
DORMAN is an established automotive aftermarket brand specializing in application-specific replacement parts and repair solutions across a broad range of vehicle systems.
DORMAN supplies products in categories including:
- Engine components
- Harmonic balancers and related parts
- Cooling system components
- Suspension and steering
- Transmission and drivetrain
- Exhaust and emissions
- Electrical systems
- HVAC
- Body and door hardware
- Automotive hardware and repair solutions
For the 594-266 Harmonic Balancer Assembly, DORMAN designed the component to exactly match the fit and function of the original harmonic balancer on specified applications.
The balancer features a stress-resistant rubber bond designed to properly absorb engine vibration and is manufactured using stringent specifications and careful construction. DORMAN subjects the component to dimensional verification, material validation, and functional testing.
DORMAN\'s automotive aftermarket product development is supported by a team of product experts in the United States and more than a century of automotive experience.
About Main Street Eshop
The DORMAN 594-266 Harmonic Balancer Assembly is supplied by Main Street Eshop, an automotive parts distributor serving professional repair shops, fleets, enthusiasts, racers, and DIY customers.
Main Street Eshop supplies replacement parts, maintenance products, engine components, suspension and steering parts, performance products, electrical components, shop supplies, RV products, and specialty automotive hardware from established manufacturers.
Our product categories include:
- Engine and cooling components
- Suspension and steering parts
- Transmission and drivetrain components
- Exhaust and emissions products
- Electrical components
- Brake parts
- Body and door hardware
- Filters and maintenance products
- Performance parts
- Fleet and commercial vehicle components
- RV products
- Shop supplies and specialty automotive hardware
Main Street Eshop focuses on straightforward product identification, detailed specifications, and clear fitment information to help customers select the correct part for their repair.
By supplying established automotive aftermarket brands such as DORMAN, Main Street Eshop helps professional repair shops, fleets, enthusiasts, racers, and DIY customers source application-specific automotive replacement components.
Buyer Fitment Reminder
Please verify DORMAN part number 594-266 against the original harmonic balancer before purchasing.
Before ordering, confirm:
- Exact vehicle year
- Make and model
- 3.4L, 3.5L, or 3.9L V6 engine exactly as listed for your application
- Serpentine drive-belt configuration
- Original harmonic balancer dimensions
- 31.8 mm inside diameter
- 167 mm outside diameter
- 40.3 mm depth
- DORMAN part number 594-266
Do not assume that all three engine sizes fit every listed model or year.
Mounting hardware is listed as included. The bolt and washer are not included, and the center bolt is specifically listed as not included.
