Dorman 420-103 Engine Timing Belt Tensioner

Dorman 420-103 Timing Belt Tensioner

Dorman 420-103 is an engine timing belt tensioner built for specified Mazda applications, including Mazda 626, Millenia, MX-6, and MX-3 models. It is made to match the original tensioner’s fit and function, with durable materials selected for dependable engine timing control.

Key Features

• Engine timing belt tensioner for specified Mazda vehicles
• Automatic hydraulic tensioner style for consistent belt tension
• Ductile iron body with cast steel contact surface
• Standard replacement part for OE-style fit and function
• Designed for applications that use a tensioner without a pulley or bracket

Detailed Description

This Dorman timing belt tensioner, part number 420-103, is engineered as a direct replacement for the original unit on select Mazda engines. The ductile iron construction and cast steel contact surface support reliable operation in the valve train system, helping maintain proper timing belt tension under normal engine conditions. For buyers searching for a Mazda 626 timing belt tensioner, Mazda Millenia timing belt tensioner, or Mazda MX-6 timing belt tensioner, 420-103 provides an OE-style replacement solution.

This part cross-references Dayco 85004 and Gates T43114 for the same application.

What It Helps Address

• Timing belt slack that can affect engine synchronization
• Noisy or inconsistent belt tension from a worn hydraulic tensioner
• Replacement needs during timing belt service on Mazda 626, Millenia, MX-6, and MX-3 engines
• Wear-related loss of tensioner performance in the valve train system
• Fitment issues caused by using the wrong tensioner style or dimensions

Installation Notes and Tips

Verify engine code and application details before installation. This tensioner uses an automatic hydraulic style, with no pulley and no bracket included, so confirm the existing setup matches the vehicle listing. Proper timing belt service procedures should be followed during replacement to maintain correct engine timing on 1992-2002 Mazda applications.

Quality Assurance

Dorman designs this replacement tensioner to match the fit and function of the original part on listed applications. It is built from quality materials for dependable performance and durability in engine timing service.

• Fits 1993-2002 Mazda 626
• Fits 1995-2001 Mazda Millenia
• Fits 1993-1997 Mazda MX-6
• Fits 1992-1994 Mazda MX-3