Gates 39157 Accessory Drive Belt Tensioner Assembly - Alternator

Overview of Gates DriveAlign Premium OE Automatic Belt Tensioner

The Gates DriveAlign Premium OE Automatic Belt Tensioner (Part Number 39157) is engineered for precise belt tension control in Volvo vehicles. Designed specifically for Volvo C30, C70, S40, and V50 models, this tensioner assembly ensures reliable accessory drive belt performance.

• Constructed from durable thermoplastic material for long-lasting use
• Single pulley design with a smooth backside contact surface
• Compatible with V-ribbed belt systems
• Mounting hole quantity: 1 for straightforward installation
• Dimensions: 2.76 inches (70 mm) outside diameter, 0.81 inches (20.5 mm) width
• Bearing bore inside diameter: 0.67 inches (17 mm)

Detailed Product Description and Specifications

This accessory drive belt tensioner assembly from Gates features a thermoplastic construction that balances strength and weight. The pulley is designed without flanges and has a smooth backside contact surface, optimized for V-ribbed belts commonly used in Volvo accessory drive systems. The tensioner includes a single pulley with a 2.76-inch (70 mm) outside diameter and a width of 0.81 inches (20.5 mm), ensuring proper belt alignment and tension. The bearing bore inside diameter measures 0.67 inches (17 mm), providing compatibility with the specified mounting hardware. This part is an exact OE comparison, meeting original equipment specifications for fit and function.

About the DriveAlign Premium OE Automatic Belt Tensioner Line

The DriveAlign Premium OE Automatic Belt Tensioner product line by Gates focuses on delivering precise belt tension control with OE exact fitment. This line is designed to maintain optimal accessory drive belt tension automatically, reducing wear and improving belt life. The 39157 tensioner assembly is part of this line, offering reliable performance tailored for Volvo vehicles requiring V-ribbed belt systems.

Common Applications and Issues Addressed

• Maintains proper tension on accessory drive belts to prevent slippage
• Reduces belt noise caused by improper tension
• Prevents premature belt wear and extends belt life
• Eliminates vibration and misalignment in the belt drive system
• Ensures consistent performance of engine accessories such as alternators and power steering pumps

Installation Notes and Tips

• Verify compatibility with Volvo C30, C70, S40, and V50 models before installation
• Ensure the mounting hole aligns correctly with the vehicle’s bracket
• Inspect the V-ribbed belt for wear and replace if necessary during installation
• Follow manufacturer torque specifications for mounting hardware
• Check belt alignment after installation to avoid premature wear

Quality Assurance and Warranty

The Gates DriveAlign Premium OE Automatic Belt Tensioner (Part Number 39157) is manufactured to meet OE standards, ensuring reliable fit and function. Gates provides quality assurance through rigorous testing and material selection. This part is backed by Gates’ warranty coverage, which protects against defects in materials and workmanship under normal use.