Gates 38158 Accessory Drive Belt Tensioner Assembly - Alternator and Power Steering, Fan and Alternator or Serpentine

Reliable Automatic Belt Tensioner for GM and Related Vehicles

The Gates DriveAlign Premium OE Automatic Belt Tensioner 38158 is engineered to maintain optimal tension on V-ribbed accessory drive belts. Designed for a range of GM vehicles including Chevrolet Silverado, GMC Sierra, and Cadillac Escalade, this tensioner assembly ensures consistent belt performance and longevity.

• Constructed with durable thermoplastic material for long-lasting use
• Features a single flanged pulley with a 2.99 inch (76 mm) outside diameter
• Equipped with a 6-groove V-ribbed contact surface for precise belt alignment
• Includes three mounting holes for secure installation
• Compatible with V-ribbed belt types commonly used in GM trucks and SUVs
• OE exact fit rated for direct replacement

About the DriveAlign Premium OE Automatic Belt Tensioner Line

The DriveAlign Premium OE Automatic Belt Tensioner line by Gates is designed to meet original equipment specifications, providing reliable belt tension control for accessory drive systems. This product line focuses on precision fitment and durable materials, such as thermoplastic pulleys and high-quality bearings, to ensure consistent performance in demanding automotive applications.

Product Details and Specifications

This accessory drive belt tensioner assembly (part number 38158) features a thermoplastic pulley with a flanged design to help maintain belt tracking. The pulley measures 2.99 inches (76 mm) in outside diameter and 0.98 inches (25 mm) in width, accommodating a 6-groove V-ribbed belt. The bearing bore inside diameter is 0.67 inches (17 mm), supporting smooth rotation and reduced wear. With three mounting holes, this tensioner is designed for secure attachment in the accessory drive system of compatible vehicles.

Compatible Vehicles and Applications

• Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab models
• Commonly used on Chevrolet Silverado 1500, 2500, 3500 series
• Fits GMC Sierra 1500, 2500, 3500 and their HD variants
• Compatible with Cadillac Escalade, Escalade ESV, and Escalade EXT
• Also suitable for Hummer H2, H3, and Isuzu Ascender

Common Issues Addressed by This Belt Tensioner

• Eliminates belt slippage caused by improper tension
• Prevents premature belt wear and noise
• Maintains consistent accessory drive performance
• Reduces risk of belt misalignment and pulley damage
• Supports smooth operation of alternator, power steering, and A/C components

Installation Notes and Tips

Ensure the engine is off and cooled before beginning installation. Verify the correct belt routing and tensioner orientation for your specific vehicle model. Use appropriate tools to remove the old tensioner and install the Gates DriveAlign Premium OE Automatic Belt Tensioner 38158 securely using the three mounting holes. Check belt alignment and tension after installation to confirm proper operation.

Quality Assurance and Warranty

Gates DriveAlign Premium OE Automatic Belt Tensioners are manufactured to meet or exceed original equipment standards. This part is rated OE exact for fit and function, ensuring reliable performance. While specific warranty details are not provided here, Gates products typically come with a limited warranty covering defects in materials and workmanship.