FAG SS3951 Engine Crankshaft Seal - Rear

Engine Crankshaft Seal for OE-Style Fitment

FAG SS3951 is an engine crankshaft seal built with a nitrile sealing material and a metal spring design with an auxiliary lip. It is sized for precise sealing performance at the crankshaft, helping maintain oil control in a wide range of classic GM applications.

Compatible With select Cadillac, Buick, Oldsmobile, Pontiac, and Chevrolet vehicles, this FAG SS3951 seal is listed for front and rear positions depending on application. It is a direct-fit service part for many 1964-1990 models, including Oldsmobile Cutlass, Cadillac DeVille, and Pontiac Grand Prix applications.

Key Features

• FAG SS3951 engine crankshaft seal
• Nitrile sealing material for oil-resistant sealing performance
• Metal spring and auxiliary lip seal type
• Precision dimensions: 2.88 in bore diameter, 2.884 in outside diameter, 2 in width
• Fits front and rear applications across multiple GM platforms
• Cross-reference: National 472082

Detailed Description

This crankshaft seal is engineered to provide a tight seal at the engine crankshaft, helping control oil leakage at the seal interface. The nitrile construction is paired with a metal spring and auxiliary lip to support consistent contact and sealing integrity in demanding engine environments. FAG SS3951 also cross-references National 472082 for the same application.

Fitment coverage includes long-tail search applications such as Fits 1980-1984 Cadillac DeVille, front; Fits 1982-1984 Pontiac Grand Prix, front; Fits 1978-1984 Oldsmobile Cutlass Calais, front; and Fits 1975-1987 Buick Regal, rear. It also applies to vehicles such as Oldsmobile Cutlass Supreme, Cadillac Fleetwood, and Pontiac Parisienne in the listed positions.

What This Seal Helps Address

• Engine oil leakage at the crankshaft seal area
• Contamination entry from dirt, dust, and moisture at the seal interface
• Loss of sealing integrity from worn or hardened original seals
• Service issues on front or rear crankshaft seal locations
• Replacement needs on classic GM passenger cars with OE-style dimensions

Installation Notes and Tips

Verify bore diameter, outside diameter, width, and seal type before installation. Match the seal position to the vehicle application, since this part is listed for both front and rear use depending on the model and year. Inspect the crankshaft sealing surface for wear, scoring, or contamination before installing the new seal.

For best results, clean the sealing area thoroughly and confirm the replacement matches the original profile and dimensions. FAG SS3951 is commonly selected for Oldsmobile Cutlass, Cadillac DeVille, and Pontiac Grand Prix service work where exact fitment matters.

Quality Assurance

FAG designs sealing components to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The seal construction and dimensional accuracy support dependable service in the listed applications.