National 51322 Wheel Seal - Rear

National 51322 Wheel Seal Overview

The National 51322 wheel seal is engineered for reliable sealing performance in driveline and axle applications. Designed specifically for Ford and Mercury vehicles, including the E-100 Econoline, Econoline, Mustang, and Villager models, this oil seal helps maintain proper lubrication and prevent contamination.

• Inside diameter: 1.365 inches (34.670 mm)
• Outside diameter: 2.085 inches (52.960 mm)
• Width: 0.435 inches (11.050 mm)
• Material: Durable nitrile rubber for resistance to oil and wear
• Redicoat coating for enhanced corrosion protection
• Series: 50000, Type: 5s
• Housing bore: 2.081 inches (52.860 mm)

Technical Details and Specifications

The National 51322 wheel seal features a nitrile rubber construction, which offers excellent resistance to petroleum-based fluids and high temperatures commonly found in automotive driveline systems. The seal’s precise dimensions—1.365 inch shaft diameter and 2.085 inch outside diameter—ensure a secure fit within the axle housing bore of 2.081 inches. The 0.435 inch width provides adequate sealing surface to prevent oil leaks and contamination ingress. Additionally, the Redicoat treatment enhances corrosion resistance, extending the service life of the seal in harsh operating environments.

Compatible Vehicles and Applications

This wheel seal is compatible with select Ford and Mercury models, including:

• Ford E-100 Econoline
• Ford Econoline series
• Ford Mustang
• Mercury Villager

It is designed to replace OEM seals in these vehicles’ driveline and axle assemblies, ensuring proper sealing and lubrication retention.

Common Issues Addressed by National 51322 Wheel Seal

• Prevents oil leaks from axle housing
• Protects bearings and internal components from dirt and moisture
• Reduces risk of driveline contamination and premature wear
• Maintains proper lubrication for axle shafts
• Helps avoid costly 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 correct orientation of the seal lip facing the lubricant side
• Check for proper fitment with the 1.365 inch shaft and 2.081 inch housing bore
• Apply a light coating of lubricant on the seal lip to ease installation

Quality Assurance and Warranty

National wheel seals are manufactured to meet industry standards for durability and performance. The 51322 part undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.