National 223802 Transfer Case Output Shaft Seal - Rear

Overview of National Transfer Case Output Shaft Seal 223802

The National Transfer Case Output Shaft Seal 223802 is engineered to provide reliable sealing performance for select BMW, Lincoln, and Suzuki models. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transfer case integrity and prevent fluid leaks.

• Inside diameter: 1.496 inches (38.000 mm)
• Outside diameter: 1.977 inches (50.220 mm)
• Thickness: 0.315 inches (8.000 mm)
• Sealing material: Polyacrylate with clockwise-spiral lip design
• Housing bore compatibility: 1.969 inches (50.000 mm)
• Redicoat coating for enhanced wear resistance
• Part number: 223802, Series 220000

Technical Description and Material Details

This transfer case output shaft seal is constructed from polyacrylate, a material known for its resistance to heat, oil, and wear. The clockwise-spiral lip design improves sealing efficiency by directing fluid back into the transfer case, reducing the risk of leaks. The Redicoat treatment further enhances the seal’s durability by providing a protective coating that extends service life. With precise inside and outside diameters, this seal fits securely within the housing bore, ensuring a tight seal around the output shaft.

Compatible Vehicles and Applications

The National 223802 seal is compatible with a range of BMW models including the 320i, 323Ci, 325i, 328i, 330i, and Z3/Z4 series. It also fits Lincoln Continental and Mark VII models, as well as Suzuki Samurai and X3/X5 vehicles. This part is specifically designed for transfer case output shaft sealing, helping to maintain proper lubrication and prevent contamination.

• Prevents transfer case fluid leaks
• Reduces risk of shaft wear due to contamination
• Maintains transfer case pressure and lubrication
• Helps avoid costly transfer case repairs
• Ensures smooth drivetrain operation

Installation Notes and Tips

When installing the National 223802 transfer case output shaft seal, ensure the housing bore and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into the bore without damaging the sealing lip. Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing performance. It is recommended to inspect the output shaft for wear or damage before installation and replace if necessary.

Quality Assurance and Warranty

National transfer case seals are manufactured to meet strict quality standards, ensuring consistent dimensions and material properties. The 223802 seal undergoes rigorous testing for durability and sealing effectiveness. This product includes a limited warranty against defects in material and workmanship, providing confidence in its long-term performance when installed correctly.