Dorman 635-118 Engine Rear Main Seal Cover

Dorman 635-118 Rear Main Seal Cover

Dorman 635-118 is a direct replacement engine rear main seal cover built to match the original equipment fit and function. It is made from aluminum and includes the rear main seal retainer, rear main seal, and gasket for a repair focused on restoring proper sealing at the back of the engine.

Key Features

• Direct replacement rear main seal cover for OE-style fitment
• Aluminum construction for engine bay durability
• Inside diameter: 5.74 in
• Length: 19 in
• Width: 20.25 in
• Package contents include the rear main seal retainer, rear main seal, and gasket
• Extensively tested to meet precise design standards

Application Details

This rear main seal cover is a fitment-based replacement for Ford Super Duty and related applications. It fits 2003-2010 Ford F-250 Super Duty, N/A; fits 2003-2010 Ford F-350 Super Duty, N/A; fits 2004-2010 Ford E-350 Super Duty, N/A; fits 2004-2005 Ford E-350 Club Wagon, N/A; and fits 2003-2005 Ford Excursion, N/A. If you are searching for a Ford F-250 Super Duty rear main seal cover or a Ford F-350 Super Duty rear main seal cover, Dorman 635-118 is built for those exact applications.

This part cross-references Ford (e.g., 3C3Z6G091A) for the same application.

What It Helps Repair

• Rear engine oil leakage at the main seal area
• Damaged or warped seal cover surfaces
• Seal retention issues caused by worn OE components
• Oil seepage that can contaminate surrounding engine parts
• Service failures related to an aging rear main seal assembly

Installation Notes and Tips

Inspect the sealing surfaces before installation and clean the engine block area thoroughly. Replace the cover only after confirming the rear main seal area is free of debris, old gasket material, and surface damage. Verify the application by year, make, and model before ordering, especially on Ford E-350 Super Duty, Ford F-250 Super Duty, and Ford F-350 Super Duty trucks.

Quality Assurance

Dorman engineered this rear main seal cover as a direct replacement part and subjected it to extensive testing to confirm design accuracy and reliable fit. The goal is consistent sealing performance that matches the original equipment cover on the listed Ford applications.