National 473677 Wheel Seal - Rear or Rear Inner

National 473677 Wheel Seal Overview

The National 473677 wheel seal is engineered to provide reliable sealing performance for a variety of vehicles including Acura, BMW, Ford, Honda, Mercury, and Toyota models. Designed with durable nitrile material, this oil seal ensures effective protection against contaminants and fluid leaks in driveline and axle applications.

• Inside diameter: 1.575 inches (40.000 mm)
• Outside diameter: 2.169 inches (55.090 mm)
• Thickness/width: 0.315 inches (8.000 mm)
• Sealing material: Nitrile for enhanced durability and resistance
• Redicoat finish for improved corrosion resistance
• Compatible with housing bore size of 2.165 inches (55.000 mm)
• Part of the National 470000 series

Technical Details and Material Specifications

This wheel seal is constructed from nitrile, a synthetic rubber known for its resistance to oil, fuel, and other automotive fluids. The 473677 seal features a precise inside diameter of 1.575 inches (40 mm) and an outside diameter of 2.169 inches (55.09 mm), making it suitable for shafts and housings matching these dimensions. The thickness of 0.315 inches (8 mm) ensures a secure fit and effective sealing under typical operating conditions. The Redicoat coating adds an extra layer of protection against corrosion, extending the service life of the seal in harsh environments.

Compatible Vehicles and Applications

This National wheel seal 473677 is compatible with a wide range of vehicles, including popular models such as the BMW 3 Series (318i, 320i, 325i, 328i, 330i, 335i), BMW M3 and M235i variants, Acura ILX, Honda Civic and CR-Z, Ford Fiesta and Escort, Mercury Topaz, and Toyota 4Runner, Sequoia, and Tundra. It is designed for driveline and axle sealing applications where reliable oil retention and contaminant exclusion are critical.

Common Issues Addressed by the National 473677 Wheel Seal

• Prevents oil leaks from axle and driveline components
• Protects bearings and shafts from dirt and moisture intrusion
• Reduces wear caused by contamination and fluid loss
• Maintains proper lubrication within wheel hubs
• Helps avoid costly drivetrain repairs due to seal failure

Installation Notes and Tips

Ensure the shaft and housing bore are clean and free of debris before installation. Verify that the inside diameter of 1.575 inches and housing bore of 2.165 inches match the application. Use appropriate tools to press the seal evenly into place without damaging the sealing lip or nitrile material. Avoid excessive force or misalignment during installation to maintain seal integrity and performance.

Quality Assurance and Warranty

National wheel seals, including part number 473677, are manufactured to meet industry standards for durability and performance. The use of nitrile material and Redicoat finish ensures resistance to oil, heat, and corrosion. While specific warranty terms may vary, National products typically come with a limited warranty against manufacturing defects, providing confidence in the product’s reliability for driveline and axle sealing needs.