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Accessory Drive Belt Cummins 3911579 | 3905871, 3289157, 3972386
Keep your engine accessories running smoothly with this high-performance ribbed accessory drive belt, designed for exceptional durability and precise fitment on Cummins engines.
Description
High-Performance Accessory Drive Belt for Cummins Engines
The Cummins 3911579 accessory drive belt (also known as a serpentine belt, alternator belt, or ribbed V-belt) is engineered to keep your engine’s critical accessories operating at peak efficiency. This heavy-duty belt drives the alternator, power steering pump, air conditioning compressor, and other vital components, ensuring reliable power transmission and extending the service life of your engine accessories.
Key Features & Benefits
- Superior Flexibility & Performance: The ribbed design combines the flexibility of a flat belt with the outstanding grip and power transmission of a V-belt.
- Built to Exact Specifications: Manufactured to strict standards to guarantee precise fitment, proper tension, and outstanding functionality.
- Exceptional Durability: Rigorously tested in real-world environments to deliver market-leading resistance to wear, heat, and abrasion.
- High Radial Strength: Provides the necessary rigidity to maintain stability and prevent slippage under demanding heavy-duty conditions.
Product Specifications
- Part Number: 3911579
- Belt Type: Ribbed V-Belt / Serpentine Belt
- Dimensions: 8PK1715 (8 ribs, 1715 mm length)
- Compatible Engine Models: Cummins 4BT 3.9, 6BT 5.9, QSB 6.7



