Dorman 635-518 Engine Rear Main Seal Cover

Dorman 635-518 Rear Main Seal Cover

Dorman 635-518 is a direct replacement engine rear main seal cover kit built to match the original cover’s fit and function. It is made from aluminum and includes the cover, seal, and gasket for a repair focused on sealing performance and OE-style fitment.

Compatible With a wide range of Chevrolet, GMC, Cadillac, Pontiac, Buick, Saab, Hummer, and Chevrolet/GMC truck applications, this rear main seal cover is used on vehicles such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Express 2500. The part number 635-518 is also referenced for multiple GM applications where precise sealing at the rear of the engine is critical.

Key Features

• Direct replacement rear main seal cover kit
• Aluminum construction for engine-side durability
• Includes cover, seal, and gasket
• Matches original equipment fit and function
• Extensively tested to meet design standards
• Fits many GM cars, SUVs, vans, and trucks from 1997-2020

Detailed Description

This Dorman rear main seal cover is engineered for vehicles that need a reliable seal at the back of the engine block. The cover’s aluminum construction and OE-style dimensions help support a precise installation, while the included seal and gasket simplify the repair process. With fitment across Chevrolet Silverado 2500 HD, GMC Savana 3500, and Cadillac CTS applications, 635-518 serves as a practical replacement for worn, damaged, or leaking rear main seal covers.

This part cross-references Pioneer Automotive Industries 500323RSH and SKP SK635518 for the same application.

What It Helps Repair

• Rear main seal oil leaks
• Oil seepage from a damaged cover or gasket surface
• Leak-related drivability issues caused by low engine oil
• Service failures after rear seal housing wear
• Seal replacement needs on GM V8 and related applications

Installation Notes and Tips

• Some applications require the Dorman 635-000 installation tool or an equivalent tool.
• Follow the included instructions exactly on improved-design applications to avoid leaks.
• Inspect the crankshaft sealing surface and surrounding block area before installation.
• Clean all mating surfaces thoroughly before fitting the new gasket and seal.
• Verify vehicle-specific fitment by year, make, and model before ordering.

Quality Assurance

Dorman states that this rear main seal cover kit has undergone extensive testing to confirm adherence to precise design standards. The part is built as a direct replacement for the original equipment cover, supporting a repair that follows OE-style fit and function expectations.