National 8940S Wheel Seal - Rear

National 8940S Wheel Seal Overview

The National 8940S wheel seal is engineered to provide reliable sealing performance for select Buick, Oldsmobile, and Pontiac models. Designed with precision dimensions and durable nitrile material, this oil seal helps maintain driveline integrity and prevent fluid leaks.

• Inside diameter: 1.523 inches (38.68 mm)
• Outside diameter: 2.718 inches (69.04 mm)
• Width: 0.500 inches (12.7 mm)
• Material: Nitrile for enhanced resistance to oil and wear
• Series: 8000, Type 48 wheel seal

Detailed Product Description

The National 8940S wheel seal is part of the 8000 series, designed specifically for driveline and axle applications requiring precise sealing solutions. Its nitrile construction offers excellent resistance to oil, grease, and other automotive fluids, ensuring long-lasting performance. The seal’s dimensions, including a 1.523-inch shaft diameter and a 2.718-inch housing bore, make it compatible with various driveline components. This wheel seal is suitable for use in Buick, Oldsmobile, and Pontiac vehicles, including models such as the Bonneville, Catalina, Delta 88, Grand Prix, LeSabre, and Starfire.

Compatible Vehicles and Applications

This wheel seal is compatible with the following makes and models:

• Buick: LeSabre, Riviera
• Oldsmobile: Delta 88, Starfire
• Pontiac: Bonneville, Catalina, Grand Prix

It is designed to maintain proper sealing in the wheel hub assembly, preventing oil leaks and contamination that can lead to driveline damage.

Common Issues Addressed by National 8940S Wheel Seal

• Prevents oil leaks from wheel hubs and axle assemblies
• Reduces contamination from dirt and debris entering the driveline
• Minimizes premature wear of axle bearings and related components
• Maintains proper lubrication within the axle housing
• Helps avoid costly driveline repairs due to seal failure

Installation Notes and Tips

• Ensure the shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to avoid damaging the seal during installation
• Verify the seal orientation matches the original part for proper sealing
• Check for any wear or damage on mating surfaces before installing the new seal
• Apply a light coating of compatible lubricant on the seal lip to ease installation

Quality Assurance and Warranty

National wheel seals are manufactured to meet strict industry standards for durability and performance. The 8940S wheel seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.