Dorman 420-117 Engine Timing Belt Tensioner

Engine Timing Belt Tensioner for Audi and Volkswagen

Dorman 420-117 is an engine timing belt tensioner built to match the fit and function of the original unit on specified applications. It uses an aluminum alloy body with a die cast aluminum contact surface and an automatic hydraulic tensioner style for consistent timing belt control.

Designed for Audi TT, Audi TT Quattro, Volkswagen Golf, Volkswagen Beetle, Volkswagen Bora, Volkswagen Jetta, Audi A4, Audi A4 Quattro, and Volkswagen Passat applications, this Dorman 420-117 replacement supports proper belt tension in engines that rely on accurate valve timing.

Key Features

• OE-style replacement for specified timing belt applications
• Aluminum alloy construction for strength and durability
• Die cast aluminum contact surface
• Automatic hydraulic tensioner style
• Standard replacement grade for direct-fit service
• Bracket not included; pulley not included

Detailed Description

This engine timing belt tensioner is engineered to match the original part’s fit and function on listed vehicles. The hydraulic automatic design helps maintain proper belt tension as engine conditions change, while the aluminum alloy construction supports long-term service in the valve train system. If you are replacing a worn timing belt tensioner on a 2000-2006 Audi TT, 2000-2006 Audi TT Quattro, or 2000-2005 Volkswagen Jetta, Dorman 420-117 provides a direct replacement option for the specified engine timing belt setup.

This part cross-references Dayco 85029 and Gates T42019 for the same application. It also cross-references 06B109477 and SK420117.

What It Helps Fix

• Timing belt slack caused by a worn tensioner
• Noise from a failing hydraulic tensioner assembly
• Inconsistent belt tension that can affect valve timing
• Premature timing belt wear from poor belt control
• Service issues on Audi and Volkswagen timing belt systems

Installation Notes and Tips

Verify engine code and VIN breakpoints before installation, especially for 2001 Audi A4 and 2001 Audi A4 Quattro models listed to VIN 8D-1-042 384. Inspect the timing belt system, related pulleys, and seals during service, and confirm the belt is routed and tensioned according to the vehicle service procedure. Because this is an automatic hydraulic tensioner, proper alignment and torque during installation are important for reliable operation.

Quality Assurance

Dorman designs this timing belt tensioner to match original fit and function on the specified applications and manufactures it from quality materials for dependable performance and durability.