Dorman 420-171 Engine Timing Belt Tensioner

Reliable Engine Timing Belt Tensioner for Audi and Volkswagen

The Dorman 420-171 engine timing belt tensioner is designed to maintain optimal tension on the timing belt for select Audi and Volkswagen models. Engineered with durable aluminum alloy, this automatic hydraulic tensioner ensures consistent performance and helps protect your engine's valve train components.

Key Features of the Dorman 420-171 Timing Belt Tensioner

• Constructed from lightweight and corrosion-resistant aluminum alloy
• Automatic hydraulic tensioner style for precise belt tensioning
• Die cast aluminum contact surface for smooth operation
• Standard replacement grade for reliable durability
• Includes one tensioner unit; bracket and pulley not included

Detailed Product Description

The Dorman 420-171 timing belt tensioner is specifically designed for compatibility with Audi A4, A6, A6 Quattro, Allroad Quattro, S4, and Volkswagen Passat models. Its aluminum alloy construction offers a balance of strength and weight savings, while the die cast aluminum contact surface reduces wear on the timing belt. This tensioner operates automatically using hydraulic pressure, eliminating the need for manual adjustments and helping maintain consistent belt tension throughout engine operation. As a standard replacement part, it meets OEM specifications to ensure proper fit and function within the engine's valve train system.

Common Applications and Issues Addressed

• Maintains proper timing belt tension to prevent belt slippage
• Reduces risk of engine misfires caused by timing belt slack
• Prevents premature wear of timing belt and related components
• Helps avoid costly engine damage due to timing belt failure
• Restores reliable timing belt operation in Audi and Volkswagen vehicles

Installation Notes and Tips

• Compatible with specific Audi and Volkswagen models; verify fitment before installation
• Installation requires removal of the timing belt cover and proper alignment of the tensioner
• Do not attempt to adjust tension manually; the hydraulic mechanism self-regulates tension
• Inspect timing belt and related components for wear during installation
• Follow vehicle manufacturer torque specifications for mounting bolts

Quality Assurance and Warranty

Dorman 420-171 is manufactured to meet industry standards for replacement engine timing belt tensioners. The part undergoes quality control inspections to ensure durability and performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Consult product documentation or supplier for exact warranty terms.