Cloyes 9-5978 Engine Timing Chain Tensioner

Cloyes Timing Chain Tensioner 9-5978

The Cloyes 9-5978 timing chain tensioner is built for engine timing service where consistent chain control matters. It is a spring-and-guide style tensioner with a metal housing, metal and nylon construction, and an included mounting bracket for a direct repair-focused replacement.

Compatible With 2014-2021 Chevrolet Silverado 1500, 2018-2021 Chevrolet Express 2500, 2018-2021 Chevrolet Express 3500, 2014-2021 GMC Sierra 1500, 2018-2021 GMC Savana 2500, and 2018-2021 GMC Savana 3500. This part number, 9-5978, is also referenced as 95978 and 12686368 for the same application.

Key Features

• Spring and guide tensioner design for timing chain control
• Metal housing with metal and nylon construction
• Activation pin style for service installation
• Mounting bracket included
• Shoe included for the tensioning surface
• Two mounting holes with 0.386 in. diameter
• Non-adjustable design

Product Details

Cloyes timing systems have been a core focus since 1921, and the Timing Chain Tensioner line is built around maintaining proper chain tension during engine operation. This engine timing chain tensioner uses spring tension and a guide-style shoe to help keep the chain properly loaded, supporting stable valve timing in service applications. The white finish, metal housing, and nylon contact components reflect a practical OE-style service part construction. For timing system integrity, Cloyes recommends replacing the chain along with the tensioners, guides, and sprockets during service. The 9-5978 is a direct-fit timing chain tensioner for select Chevrolet and GMC trucks and vans, including Silverado 1500 and Sierra 1500 applications.

Common Problems This Part Addresses

• Timing chain slack that can affect engine timing stability
• Noise from a worn or weak chain tensioner
• Uneven chain loading caused by a damaged guide surface
• Timing service repairs that require a replacement tensioner assembly
• Wear-related issues in high-mileage Chevrolet Silverado 1500 and GMC Sierra 1500 engines

Installation Notes

Use the activation pin during installation and verify the tensioner seats correctly against the chain guide. Inspect the timing chain, guides, and sprockets before reassembly, and replace worn components together to maintain timing system integrity. Confirm vehicle application by year, make, and model before installation on Chevrolet Express 2500, Chevrolet Express 3500, GMC Savana 2500, and GMC Savana 3500 service vehicles.

Quality Assurance

Cloyes has supplied timing system components for over a century and backs its products with industry-leading technical support. The 9-5978 timing chain tensioner is engineered for professional engine service and supported by Cloyes brand expertise in timing components.