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Engine Harmonic Balancer

Quality Guaranteed • Aftermarket Value • Backed by Warranty • 30 Day Return Policy

Dorman# 594-003

Replaces General Motors# 25527381, 88959266

Serpentine Belt
Diameter: 7", Width: 3-3/4"

Fits the Following Applications:

1988 PONTIAC BONNEVILLE: LE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 OLDSMOBILE DELTA 88: ROYALE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 OLDSMOBILE DELTA 88: ROYALE BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 OLDSMOBILE CUTLASS CIERA V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 OLDSMOBILE CUTLASS CIERA: SL V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 OLDSMOBILE CUTLASS CIERA: INTERNATIONAL V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 OLDSMOBILE CUTLASS CIERA: BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 BUICK LESABRE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 BUICK LESABRE: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 BUICK LESABRE: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1988 BUICK CENTURY: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 BUICK CENTURY: ESTATE WAGON V6 - 3.8L (231 CID): GAS: FI: N: 3
1988 BUICK CENTURY: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 PONTIAC BONNEVILLE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 PONTIAC BONNEVILLE: LE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 OLDSMOBILE DELTA 88: ROYALE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 OLDSMOBILE DELTA 88: ROYALE BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 OLDSMOBILE CUTLASS CIERA V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 OLDSMOBILE CUTLASS CIERA: SL V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 OLDSMOBILE CUTLASS CIERA: S V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 OLDSMOBILE CUTLASS CIERA: BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 OLDSMOBILE 98: REGENCY V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 OLDSMOBILE 98: REGENCY BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK LESABRE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK LESABRE: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK LESABRE: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK ELECTRA: T-TYPE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK ELECTRA: PARK AVENUE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK ELECTRA: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1987 BUICK CENTURY: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 BUICK CENTURY: ESTATE WAGON V6 - 3.8L (231 CID): GAS: FI: N: 3
1987 BUICK CENTURY: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3
1986 OLDSMOBILE DELTA 88: ROYALE V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1986 OLDSMOBILE DELTA 88: ROYALE BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1986 OLDSMOBILE CUTLASS CIERA V6 - 3.8L (231 CID): GAS: FI: N: 3
1986 OLDSMOBILE 98: REGENCY V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 OLDSMOBILE 98: REGENCY BROUGHAM V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 BUICK LESABRE: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1986 BUICK LESABRE: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 BUICK LESABRE: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3 Stamped 25527381 or 25527009
1986 BUICK ELECTRA V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 BUICK ELECTRA: T-TYPE V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 BUICK ELECTRA: PARK AVENUE V6 - 3.8L (231 CID): GAS: FI: N: B Stamped 25527381 or 25527009
1986 BUICK CENTURY: T-TYPE V6 - 3.8L (231 CID): GAS: FI: N: 3
1986 BUICK CENTURY: LIMITED V6 - 3.8L (231 CID): GAS: FI: N: 3
1986 BUICK CENTURY: ESTATE WAGON V6 - 3.8L (231 CID): GAS: FI: N: 3
1986 BUICK CENTURY: CUSTOM V6 - 3.8L (231 CID): GAS: FI: N: 3

Automotive Accessory Color / Finish: Black
Automotive Item Weight (lbs): 6.75
Degree Markings: Yes
Hardware Included: Yes
Package Contents: Balancer, Bolt, Woodruff Key, Instruction Sheet
Remanufactured Part: No
Warranty: Limited Lifetime Warranty

Dorman Engine Harmonic Balancer

Durable and sleek, Dorman Harmonic Balancers feature a stress-resistant rubber bond that withstands the damaging effects of heat, salt, ozone and general wear and tear. The ductile steel construction allows for improved tensile and impact strength, safeguarding the engine and maintaining fuel efficiency year after year. Dorman Harmonic Balancers undergo detailed dimensional checks of the full assembly and critical components to ensure the strength and integrity of the part.

  • Includes woodruff key, bolts, and washers for a complete repair (where applicable)
  • Direct replacement to ensure proper fit
  • Ships with protective sleeve over cone and trigger to prevent damage (where applicable)
  • Ease of installation with Dorman's Harmonic Balancer Puller (594-999)
Search Keywords: Engine, Harmonic, Balancer, Balancers
Dorman Part Type Alias: Harmonic Balancer
Alternate Names: Crankshaft Pulley, Crankshaft Dampener, Crankshaft Damper, Harmonic Dampener
Dorman Harmonic Balancers
Harmonic Balancers have a 30% OE Failure Rate due to
  • The effects of heat, salt and ozone on the rubber damper.
  • Stress on the rubber damper from integrated drive & accessory pulleys
  • Damage to sensors resulting in faulty inputs to the CKP / ECM
Dorman offers an enhanced design including
  • Stronger rubber bond for greater durability
  • Ductile steel for improved tensile and impact strength
  • Refined machining for improved appearance

Information for Buyers

Placement reference diagram
FAQ & Common Terms
  • Left & Right is the orientation when sitting in the car. Left indicates Driver's side, Right Passenger's side.
  • New Take-Off (NTO) means a quality, low-cost OEM part in like-new condition. See More »
  • New Old Stock (NOS) means a fully-functioning, still-new item which may be dusty from storage. See More »
Shipping Details
  • International Buyers – Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying.
  • Shipping directions left in Paypal Notes will NOT be considered. Please contact us directly if you have a special request. Please note that we cannot accomodate requests such as "Leave on Porch"; such directions are better directed to your local delivery person.
  • Free Shipping, when advertised, is only for destinations within the contiguous US. All other destinations must pay additional fees.
  • Shipping Method may be changed or upgraded by request, but may involve an upcharge. We reserve the right to change to a method of comparable speed without notice. See More »
  • Handling Time may be longer than advertised for special-order items and items bound for international and non-contiguous destinations.
  • Backorders may occur. We can confirm stock any time on request. In the event of a backorder, we will contact you promptly.
Troubleshooting Problems
  • Payment Delays Unpaid item grievances are initiated within 14 days when payment has not been made. Payment may still be made after grievance is initiated, and will cancel the grievance.
  • Adjustments or Cancellations can be made without penalty as long as item has not yet shipped; just contact us!
  • Item Arrives Damaged Please preserve the package and contact us as soon as possible with a photo of the damage. See More »
  • Lost Package If you suspect your package is lost, contact us so we can investigate or send a replacement.
Quality Assurance, Returns & Warranty
  • Returns & Exchanges Accepted for any reason within 30 days for unused & unaltered products. Fees may apply.
  • To Initate a Return or Exchange, contact us BEFORE shipping & please read our full return policy: See More »
  • This Item has a Warranty: One year against manufacturer's defects. Initiate a Claim »
  • Disclaimer: We do not reimburse any installment or mechanic fees; returns and warranties cover only the value of the part itself, no associated labor.
Customer Service
  • Hours Live customer service is available Monday through Friday from 9am to 5pm EST, excluding US National Holidays.
  • Email should be directed through eBay's "Ask a Question" link. Responses within one business day.
  • Phone calls should be directed to 888-533-9119 (Toll Free).
RNB-594-003