Dayco 5040270 | Serpentine Belt

Part Number
Serpentine Belt

Fits: 85-88 Chevrolet Spectrum, 85-89 Isuzu I-Mark, 85-88 Pontiac Sunburst, 89 Geo Spectrum, 12-14 Fiat 500

Special Price $15.22 Regular Price $19.21
In stock
Only 2 left
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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 Length27.00
Effective Length685.80
MaterialEPDM, Aramid Reinforced
Maximum Operating Temperature212
Maximum Operating Temperature100
Minimum Operating Temperature-45
Minimum Operating Temperature-42.7
Outside Circumference27.66
Outside Circumference702.57
Rib DepthStandard
Rib ProfileStraight Rib
StandardsSAE J1459, SAE J2432
Top Width.54

w/o A.C.



  • Driveworks: 270K4
  • Pirelli: 270K4
  • Isuzu: 8-94139-067-0
  • AutoZone: 270K4
  • Duralast: 270K4
  • CARQUEST: K040270
  • Atlas: 4K0270
  • Gates: K040270
  • ACDelco: 4K270
  • NAPA: 25-70686
  • Beck/Arnley: 141-1306
  • Mighty: 4K270
  • NAPA: 25-040270
  • V&W: 270K4
  • Goodyear: 4040270
  • Beck/Arnley: 141-1305
  • Freshstart: 270K4


  • 1985-1988 Pontiac Sunburst - Position: Alternator
  • 2012-2013 Fiat 500
  • 1985-1989 Isuzu I-Mark - Position: Alternator
  • 1985-1988 Chevrolet Spectrum - Position: Alternator
  • 2014-2014 Fiat 500 - Position: Main Drive
  • 1989-1989 Geo Spectrum - Position: Alternator
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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