Dayco 89398 Accessory Drive Belt Tensioner Assembly

Overview of Dayco Accessory Drive Belt Tensioner Assembly 89398

The Dayco 89398 accessory drive belt tensioner assembly is designed for select Volvo models, including the 850, 960, C70, S70, and V70. This automatic tensioner features a serpentine belt type and a counterclockwise direction, ensuring proper belt tension and alignment for optimal engine performance.

• Serpentine belt type for efficient power transmission
• Automatic tensioner design for consistent belt tension
• Counterclockwise rotation direction
• Single pulley with a 76 mm diameter and 26.2 mm width
• Pulley features a flat surface for reliable belt contact

Technical Details and Specifications

The Dayco 89398 tensioner assembly includes one pulley with a diameter of 76 mm and a width of 26.2 mm, designed with a flat surface to maintain proper belt engagement. Its automatic tensioner mechanism adjusts tension dynamically, reducing the need for manual adjustments and helping to extend belt life. The tensioner rotates counterclockwise, matching the accessory drive system requirements of compatible Volvo vehicles. This component is engineered to work specifically with serpentine belts, which are common in modern Volvo engines for driving multiple accessories efficiently.

Compatible Volvo Models and Applications

This accessory drive belt tensioner assembly is compatible with the following Volvo models: 850, 960, C70, S70, and V70. It is intended for use in the accessory drive belt system, ensuring proper tension and alignment of the serpentine belt to maintain smooth operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor.

• Maintains correct serpentine belt tension to prevent slippage
• Reduces belt noise and vibration
• Prevents premature belt wear and damage
• Supports smooth operation of engine accessories
• Helps avoid accessory drive system failures

Installation Notes and Tips

When installing the Dayco 89398 tensioner assembly, ensure the serpentine belt is properly routed according to the vehicle’s belt diagram. The counterclockwise rotation direction must be observed to align with the engine’s accessory drive system. Use appropriate tools to relieve tension from the old tensioner before removal. Verify pulley alignment and belt condition during installation to avoid future issues.

Quality Assurance and Warranty

Dayco manufactures the 89398 tensioner assembly to meet or exceed OEM specifications for durability and performance. While specific warranty details are not provided here, Dayco products typically come with manufacturer-backed warranties covering defects in materials and workmanship. This ensures reliable operation when installed in compatible Volvo 850, 960, C70, S70, and V70 models.