Dorman 420-129 Secondary Timing Chain Tensioner Kit

The Dorman 420-129 is a secondary timing chain tensioner designed to maintain optimal tension on your engine's timing chain, crafted to meet OE-level quality and reliability standards for various GM vehicles. This hydraulic tensioner is designed to match the fit and function of the original tensioner on specified applications.

Key Features:

• Includes both tensioners for a complete secondary timing chain tensioner replacement
• Direct replacement designed to match the fit and function of the original tensioner
• Recommended for replacement when a new timing chain and pulleys are installed
• Made of quality materials and engineered for reliable performance and durability
• Backed by a team of product experts in the United States and more than a century of automotive experience

This tensioner replaces OEM part numbers 12609261, 12589478, 12589479, 12609260, 12609259, 12609258, 11588255, BT5536, and T68002. Maintaining proper timing chain tension is critical to prevent engine noise, poor performance, and potential engine damage caused by chain slippage.