Dayco 5050385 | Serpentine Belt

Part Number
Serpentine Belt

Fits: 90-92 Daihatsu Rocky, 90-93 Toyota Celica, 93-95 BMW 740i, 93-95 BMW 740iL, 93-97 Jaguar Vanden Plas, 93-97 Jaguar XJ6, 93-96 Jaguar XJS, 94-95 BMW 530i, 94-95 BMW 540i, 94-95 BMW 840Ci, 94-95 Mazda 929, 95-97 Jaguar XJR, 00-03 BMW M5, 00-03 BMW Z8

Special Price $18.00 Regular Price $21.99
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Estimated Ship Date: 1 Business Day or Less
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 Length38.58
Effective Length979.94
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-45
Minimum Operating Temperature-42.7
Outside Circumference996.70
Outside Circumference39.24
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width.68



  • Gates: K050385
  • Toyota: 99365-10980
  • Mazda: JE74-15-908
  • Toyota: 99365-00980
  • Bando: 5PK980
  • NAPA: 25-70979
  • CARQUEST: K050385
  • Toyota: 90916-02304
  • BMW: 11 28 7 833 266
  • BMW: 11 28 1 469 256
  • ACDelco: 5K385
  • Jaguar: EBC11306
  • BMW: 11 28 1 736 759
  • Driveworks: 385K5
  • NAPA: 25-050385
  • Jaguar: KB03700BA
  • Beck/Arnley: 146-050980
  • BMW: 1.735.759
  • Goodyear: 4050385
  • ContiTech: PK050385
  • Jaguar: NBC3700AA
  • Jaguar: EBC1103
  • Freshstart: 385K5
  • Jaguar: EBC4450
  • Duralast: 385K5
  • Daihatsu: 90048-31005
  • Dynacraft: D1102-6330
  • Toyota: 99365-20980
  • Jaguar: NBD3700BA
  • BMW: 11 28 1 736 988


  • 1994-1995 BMW 840Ci - Position: Air Conditioning
  • 1993-1995 BMW 740i - Position: Air Conditioning and Tensioner
  • 1993-1996 Jaguar XJS - Position: Alternator and Water Pump
  • 1993-1997 Jaguar XJ6 - Position: Alternator and Water Pump
  • 1994-1995 BMW 530i - Position: Air Conditioning and Tensioner
  • 1994-1995 Mazda 929 - Position: Air Conditioning and Idler
  • 2000-2003 BMW Z8 - Position: Air Conditioning and Tensioner
  • 1990-1992 Daihatsu Rocky - Position: Power Steering
  • 1994-1995 BMW 540i - Position: Air Conditioning and Tensioner
  • 2000-2003 BMW M5 - Position: Air Conditioning and Tensioner
  • 1993-1997 Jaguar Vanden Plas - Position: Alternator and Water Pump
  • 1990-1993 Toyota Celica - Position: Water Pump and Alternator
  • 1993-1995 BMW 740iL - Position: Air Conditioning and Tensioner
  • 1995-1997 Jaguar XJR - Position: Alternator and Water Pump
Customer Questions
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.
Please, mind that only logged in users can submit questions

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