Gates 38174 Accessory Drive Belt Tensioner Assembly - Alternator, Power Steering and Water Pump or Serpentine

Overview of Gates DriveAlign Premium OE Automatic Belt Tensioner

The Gates DriveAlign Premium OE Automatic Belt Tensioner 38174 is engineered to maintain optimal tension on the accessory drive belt system. Designed for select Chrysler and Mercedes-Benz models, this tensioner assembly ensures consistent belt performance and longevity.

• Constructed from durable thermoplastic material for reliable operation
• Compatible with V-ribbed belt types commonly used in luxury and performance vehicles
• Features a smooth backside contact surface to reduce belt wear
• Includes a single pulley with a 3.54 inch (90 mm) outside diameter and 1.02 inch (26 mm) width
• Mounting configuration includes two holes for secure installation
• OE exact fitment for precise replacement and performance

Detailed Product Description and Specifications

This accessory drive belt tensioner assembly is designed with a thermoplastic body that balances strength and weight, contributing to efficient engine operation. The pulley is not flanged, which suits the V-ribbed belt system it supports. The bearing bore inside diameter measures 0.67 inches (17 mm), ensuring smooth rotation and reduced friction. With an outside diameter of 3.54 inches (90 mm) and a width of 1.02 inches (26 mm), the tensioner fits securely within the accessory drive system. The smooth backside contact surface minimizes belt abrasion, extending belt life and maintaining consistent tension.

DriveAlign Premium OE Automatic Belt Tensioner Product Line

The DriveAlign Premium OE Automatic Belt Tensioner line by Gates focuses on delivering original equipment quality and fitment. This product line is engineered to meet or exceed OEM specifications, providing reliable tension control for accessory drive belts. The 38174 part number is part of this line, ensuring compatibility and performance for vehicles requiring precise belt tension management.

Compatible Vehicles and Common Applications

• Chrysler Crossfire
• Mercedes-Benz C43 AMG, C55 AMG, C240, C280, C320
• Mercedes-Benz CL55 AMG, CL500
• Mercedes-Benz CLK55 AMG, CLK320, CLK430, CLK500
• Mercedes-Benz CLS55 AMG, CLS500
• Mercedes-Benz E55 AMG, E320, E430, E500
• Mercedes-Benz G55 AMG, G500
• Mercedes-Benz ML55 AMG, ML320, ML350, ML430, ML500
• Mercedes-Benz R500, S55 AMG, S350, S430, S500
• Mercedes-Benz SL55 AMG, SL500, SLK55 AMG, SLK320

Common Issues Addressed by This Belt Tensioner

• Eliminates belt slippage caused by improper tension
• Prevents premature belt wear and cracking
• Reduces noise from loose or misaligned belts
• Maintains consistent accessory drive performance
• Helps avoid engine overheating due to accessory failure

Installation Notes and Tips

Ensure the vehicle is off and cooled before beginning installation. Verify the part number 38174 matches the original tensioner. Use proper tools to remove the old tensioner and install the new one, aligning the mounting holes correctly. Check belt alignment and tension after installation to confirm proper operation. Refer to vehicle-specific service manuals for torque specifications and detailed procedures.

Quality Assurance and Warranty

The Gates DriveAlign Premium OE Automatic Belt Tensioner 38174 is manufactured to meet original equipment standards, providing reliable performance and durability. This part is rated as an OE exact replacement, ensuring fit and function. Warranty details are provided by Gates and typically cover defects in materials and workmanship under normal use.