National 221820 Manual Transmission Shift Shaft Seal

Overview of National 221820 Manual Transmission Shift Shaft Seal

The National 221820 manual transmission shift shaft seal is engineered to provide reliable sealing performance for a variety of vehicle makes and models. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 0.709 inch (18.000 mm)
• Outside diameter: 1.189 inch (30.200 mm)
• Thickness: 0.276 inch (7.000 mm)
• Sealing material: Polyacrylate for enhanced durability
• Clockwise-spiral lip design for effective sealing
• Compatible housing bore: 1.181 inch (30.000 mm)

Detailed Product Description and Specifications

The National 221820 shift shaft seal is part of the 220000 series, designed specifically for manual transmissions requiring a 32-type seal. Constructed from polyacrylate, this seal offers resistance to heat and wear, ensuring long-lasting performance in demanding transmission environments. The clockwise-spiral lip design improves sealing efficiency by maintaining consistent contact with the shaft, reducing the risk of oil leaks. With precise inside and outside diameters, this seal fits housing bores measuring approximately 1.181 inches (30 mm) and shafts of 0.709 inches (18 mm) diameter, making it suitable for a wide range of vehicles.

Compatible Vehicles and Applications

This manual transmission shift shaft seal is compatible with various makes and models, including Chevrolet, GMC, Honda, Isuzu, Lexus, Nissan, Plymouth, Pontiac, Scion, Subaru, Toyota, and Volkswagen. Common models include the Toyota 4Runner, Honda Accord, Nissan 200SX, Subaru Impreza, Volkswagen Golf, and many others. The National 221820 seal is ideal for vehicles requiring a reliable transmission oil seal to maintain proper fluid containment and transmission function.

Common Issues Addressed by the National 221820 Seal

• Prevents manual transmission fluid leaks around the shift shaft
• Reduces contamination ingress into the transmission system
• Minimizes wear on transmission components by maintaining proper lubrication
• Helps avoid transmission shifting problems caused by fluid loss
• Protects against premature seal failure due to heat and friction

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to avoid damaging the seal during installation
• Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing
• Check shaft and bore dimensions to confirm compatibility with the 0.709 inch shaft and 1.181 inch housing bore
• Apply a light coating of transmission fluid or compatible lubricant to the seal lip before installation

Quality Assurance and Warranty Information

National manufactures the 221820 manual transmission shift shaft seal to meet industry standards for durability and performance. The polyacrylate material and precise engineering ensure consistent sealing under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.