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Dayco 5080900 Serpentine Belt - Fan, Alternator and Idler or Main Drive
| Brand | Dayco 5080900 |
|---|---|
| Position | Fan, Alternator and Idler and Main Drive |
| Material | Epdm, aramid reinforced |
| Top Width | 1.10 |
| Color | Black |
| Effective Length | 2286.00 |
| Effective Length | 90.00 |
| Outside Circumference | 2302.01 |
| Outside Circumference | 90.63 |
| Rib Quantity | 8 |
| Cross Section | K-section |
| Maximum Operating Temperature | 100 |
| Maximum Operating Temperature | 212 |
| Minimum Operating Temperature | -42.7 |
| Minimum Operating Temperature | -45 |
| Rib Depth | Standard |
| Rib Profile | Straight rib |
| Standards | Sae j1459, sae j2432 |
| Fits | Ford and Mercury · 9 vehicles |
Aramid reinforced. EPDM construction adds strength and durability for dependable belt performance.
Straight rib profile. Helps maintain consistent contact and smooth power transfer.
SAE J1459, SAE J2432. Built to meet recognized belt performance standards.
Cross-references Cummins 3978279, Driveworks 900K8 and Duralast 900K8 for the same application. See all 30.
Dayco 5080900 Serpentine Belt Overview
The Dayco 5080900 serpentine belt is a K-section accessory drive belt built for main drive applications that demand stable grip and consistent power transfer. It uses EPDM with aramid reinforcement for durability, with an 8-rib straight-rib profile and a black finish.
Compatible With 1989-1995 Ford Thunderbird, Main Drive, and 1989-1990 Mercury Cougar, Main Drive. This Dayco 5080900 belt is also cross-referenced to Motorcraft JK8-904 for the same application.
Key Features
- EPDM construction with aramid reinforcement for strength and wear resistance
- 8-rib K-section design for accessory drive applications
- 1.10 in. top width for proper belt tracking
- 90.00 in. effective length and 90.63 in. outside circumference
- Straight rib profile with standard rib depth
- Operates from -45°F to 212°F
- Built to SAE J1459 and SAE J2432 standards
Detailed Description
Dayco 5080900 is a serpentine belt for the main drive system on select Ford and Mercury vehicles. It is specified for 1989-1995 Ford Thunderbird and 1989-1990 Mercury Cougar applications, where the accessory drive belt must maintain consistent engagement across multiple pulleys. The EPDM rubber compound and aramid reinforcement support long-term belt stability under heat, cold, and continuous engine operation.
With its 8-rib K-section profile, this belt is sized for accessory drive routing that depends on accurate rib alignment and dependable tension retention. The Dayco 5080900 is a direct-fit replacement option for owners servicing a Ford Thunderbird or Mercury Cougar main drive belt system and looking for a part that matches the listed dimensions and standards.
What This Belt Helps Address
- Squealing or slipping from a worn serpentine belt
- Cracking, glazing, or rib wear on the accessory drive belt
- Loss of accessory drive performance from belt stretch or age
- Improper belt tracking caused by incorrect belt dimensions
- Service replacement for aging Ford Thunderbird and Mercury Cougar main drive systems
Installation Notes and Tips
Verify belt routing, rib count, and length against the existing belt before installation. Inspect pulleys, tensioners, and idlers for wear or misalignment, since those conditions can shorten belt life and affect tracking. Confirm the application is the main drive position on the listed vehicle before ordering.
Quality Assurance
This Dayco serpentine belt is manufactured to SAE J1459 and SAE J2432 standards and uses EPDM with aramid reinforcement for consistent performance in demanding accessory drive service.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1995 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1994 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1993 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1992 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1991 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1990 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1990 | Mercury | Cougar | 3.8L | V6 | Main Drive | — |
| 1989 | Ford | Thunderbird | 3.8L | V6 | Main Drive | — |
| 1989 | Mercury | Cougar | 3.8L | V6 | Main Drive | — |
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