Dorman 635-000 Engine Crankshaft Rear Seal Installation Tool

Engine Rear Seal Installation Tool for GM V8 Applications

The Dorman 635-000 engine crankshaft rear seal installation tool helps align the rear main seal cover on specified GM applications during service. It is built from steel with a zinc-plated finish for added durability, making it a practical choice for rear seal work on Chevrolet Silverado, GMC Sierra, Cadillac CTS, and related vehicles.

• Steel construction with zinc plating for corrosion resistance
• Helps position the rear main seal cover correctly on the crankshaft
• Supports rear seal service on a wide range of Chevrolet, GMC, Cadillac, Buick, Pontiac, Saab, Hummer, and Chevrolet/GMC truck applications
• Seal diameter range: 3.65 to 3.8 inches
• Compact 1.5-inch tool size for engine service use
• Part number 635-000 for easy identification

Detailed Product Overview

Dorman 635-000 is an engine crankshaft rear seal installation tool used when replacing the rear main seal cover on specified vehicle applications. Proper alignment is critical during this repair because incorrect positioning can lead to seal damage and oil leaks. This tool is sized for rear seal service with a minimum outside diameter of 3.65 inches and a maximum outside diameter of 3.8 inches, and its steel body with zinc plating is made for repeated shop use. This part cross-references J414792B for the same application.

Compatible With 1997-2020 Chevrolet Corvette, Camaro, Impala, Monte Carlo, Silverado, Suburban, Tahoe, Express, Avalanche, Colorado, SSR, and Silverado HD applications; 1998-2019 GMC Sierra, Yukon, Savana, Envoy, Canyon, and Hummer-related service platforms; and 2002-2015 Cadillac CTS, Escalade, and Escalade EXT applications. The 635-000 is also referenced for select Pontiac, Buick, Saab, and Hummer models listed in the fitment data.

What This Tool Helps Address

• Rear main seal cover misalignment during installation
• Seal damage caused by uneven seating on the crankshaft
• Oil leaks after rear seal service
• Repeat repairs caused by improper cover positioning
• Fitment-specific service needs on Chevrolet Silverado 1500, GMC Sierra 1500, and Cadillac CTS applications

Installation Notes and Tips

Follow the vehicle-specific instructions exactly, especially on improved-design applications noted in the fitment data. Clean the sealing surfaces before installation, verify the seal diameter range matches the application, and confirm the cover is centered on the crankshaft before final assembly. For best results, use the tool only on the listed applications and inspect the rear main seal area for damage before reassembly.

Quality Assurance

Dorman manufactures service tools and replacement parts for automotive repair applications, and this installation tool is made from steel with a zinc-plated finish for durability in engine service work. The part number 635-000 helps ensure correct ordering and application matching.