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Dayco 89450 Accessory Drive Belt Tensioner Assembly - Alternator and Air Conditioning, Alternator and Water Pump or Fan
| Brand | Dayco 89450 |
|---|---|
| Position | Alternator and Water Pump, Fan, and Alternator and Air Conditioning |
| Belt Type | Serpentine |
| Direction | Counter clock wise |
| Number of Pulleys | 1 |
| Pulley 1 Diameter | 74 |
| Pulley 1 Flat | Y |
| Pulley 1 Width | 46.27 |
| Type | Automatic |
| Fits | — |
Automatic tensioning. Maintains proper serpentine belt tension with less adjustment.
Single-pulley design. Keeps the accessory drive belt system compact and efficient.
Serpentine belt compatible. Built for smooth operation in accessory drive applications.
Cross-references ACDelco 38611, ACDelco 38668 and CARQUEST 38611 for the same application. See all 15.
Dayco 89450 Accessory Drive Belt Tensioner Assembly
The Dayco 89450 is an automatic accessory drive belt tensioner assembly for serpentine belt systems. It helps maintain proper belt tension in applications that rely on consistent accessory drive performance, including common automotive and medium-duty setups such as Mack truck belt drive systems.
Key Features
- Accessory drive belt tensioner assembly for serpentine belt applications
- Automatic tensioning design helps maintain steady belt load
- Counter clockwise direction
- Single pulley design
- 74 mm pulley diameter with 46.27 mm pulley width
- Flat pulley surface identified as pulley 1 flat: Y
- Dayco part number 89450
Product Details
Built for serpentine belt routing, this Dayco tensioner assembly is specified with one pulley and an automatic tensioning mechanism. The counter clockwise rotation and pulley dimensions are important for correct belt tracking and accessory drive operation. This part cross-references Duralast 89450 for the same application. Dayco 89450 is also referenced in interchange listings for ACDelco, CARQUEST, Gates, Goodyear, Mack, and NAPA applications, making it a practical replacement choice when matching an existing accessory drive belt tensioner assembly.
Common Issues This Part May Address
- Belt slack in a serpentine drive system
- Noise from a worn or unstable tensioner assembly
- Uneven belt tracking across accessory pulleys
- Loss of proper belt tension during engine operation
- Accessory drive performance problems related to tensioner wear
Installation Notes and Tips
Verify pulley diameter, width, rotation direction, and belt type before installation. Match the automatic tensioner layout to the original part and confirm serpentine belt routing against the vehicle service information. For fitment-based searches, this part is commonly referenced for Mack truck accessory drive belt tensioner assembly applications, including Mack 87GB45 and related interchange numbers. It is also searched as Dayco 89450 for serpentine belt tensioner replacement.
Quality Assurance
Dayco is a recognized name in belt drive system components, and this tensioner assembly is cataloged with detailed dimensional and directional specifications to support accurate replacement selection. Use the listed attributes and interchange references to confirm application match before ordering.
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