Dayco 5050520 Serpentine Belt

Part Number
Serpentine Belt

Fits: 87-88 Buick Skyhawk, 87-88 Oldsmobile Firenza, 87-89 Pontiac Grand Am, 87-94 Pontiac Sunbird, 88-90 Pontiac Optima, 89-90 Pontiac LeMans, 97 Mitsubishi Mirage

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Designed for high mileage multiple-accessory drivesthe Dayco® “W” profile belt (patent pending) is the most innovative advancement in multi-rib belt design in over 25 years. Developed through extensive laboratory and actual road mileage testing, this unique rib profile has been specifically Dayco® engineered to conform to high mileage, worn or misaligned drives without a sacrifice in quiet, long-lasting performance. The "W" profile cut into the tip of each rib makes the tip more flexible and eliminates belt chirp when the belt enters a worn or misalligned pulley. Constructed with Aramid reinforced EPDM compounds, the Dayco® “W” profile belt delivers more than OE required delivers the solution to troublesome drive problems. Dayco® Poly-Rib® Belts meet or exceed SAE J1459 and SAE J2432 specifications.

BRAND: Dayco




Cross SectionK-Section
Effective Length52.00
Effective Length1320.80
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-45
Minimum Operating Temperature-42.7
Outside Circumference1337.57
Outside Circumference52.66
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width.68



  • General Motors: 10198884
  • Mighty: 5K520
  • Driveworks: 520K5
  • NAPA: 25-71320
  • Dynacraft: D1102-6337
  • Mack: 88GB448P520
  • Cummins: 3036042
  • Goodyear: 4050520
  • Duralast: 520K5
  • CARQUEST: K050520
  • NAPA: 25-050520
  • Pirelli: 520K5
  • Freshstart: 520K5
  • V&W: 520K5
  • General Motors: 14076482
  • Beck/Arnley: 146-051320
  • Mitsubishi: MD317245
  • Gates: K050520
  • ACDelco: 5K520
  • Bando: 5PK1320
  • ContiTech: PK050520


  • 1988-1988 Oldsmobile Firenza - Position: Alternator, Power Steering and Tensioner
  • 1988-1988 Buick Skyhawk - Position: Alternator, Power Steering and Tensioner
  • 1989-1990 Pontiac LeMans - Position: Alternator, Power Steering and Tensioner
  • 1987-1987 Buick Skyhawk - Position: Fan, Alternator and Power Steering
  • 1997-1997 Mitsubishi Mirage - Position: Power Steering, Air Conditioning and Idler
  • 1987-1987 Oldsmobile Firenza - Position: Main Drive
  • 1988-1990 Pontiac Optima - Position: Alternator, Power Steering and Tensioner
  • 1987-1987 Pontiac Sunbird - Position: Alternator and Power Steering
  • 1988-1994 Pontiac Sunbird - Position: Alternator, Power Steering and Tensioner
  • 1988-1989 Pontiac Grand Am - Position: Alternator, Power Steering and Tensioner
  • 1987-1987 Pontiac Grand Am - Position: Alternator and Power Steering
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