National 223801 Manual Transmission Input Shaft Seal - Front

Reliable Manual Transmission Input Shaft Seal for Select Vehicles

The National 223801 manual transmission input shaft seal is engineered to provide dependable sealing performance for a range of vehicles including Toyota, Nissan, Mazda, and more. Designed with durable nitrile material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Inside diameter: 1.496 inches (38.000 mm)
• Outside diameter: 1.980 inches (50.280 mm)
• Thickness/width: 0.236 inches (6.000 mm)
• Sealing material: Nitrile for resistance to oil and wear
• Compatible housing bore: 1.969 inches (50.000 mm)
• Part number: 223801 from National's 220000 series

Technical Details and Material Specifications

This manual transmission input shaft seal features a nitrile rubber construction, chosen for its excellent resistance to petroleum-based fluids and mechanical wear. The seal’s precise dimensions—1.496 inch inside diameter and 1.980 inch outside diameter—ensure a secure fit within the transmission housing bore of 1.969 inches. With a thickness of 0.236 inches, the seal maintains optimal contact pressure to prevent oil leakage while accommodating shaft movement. The 220000 series from National is known for consistent manufacturing standards, making part number 223801 a reliable choice for transmission maintenance.

Compatible Vehicles and Applications

This input shaft seal is compatible with a variety of manual transmission models from manufacturers such as Toyota, Nissan, Mazda, Mitsubishi, Subaru, and more. It fits vehicles including the Toyota 4Runner, Camry, Corolla, Tacoma, and RAV4; Nissan 240SX, 300ZX, Pathfinder, and Frontier; Mazda Miata and RX-7; as well as models from Chrysler, Dodge, Lexus, INFINITI, Pontiac, Plymouth, Scion, and others. Using part number 223801 ensures proper sealing performance in these applications, helping maintain transmission fluid integrity and preventing contamination.

Common Issues Addressed by the Input Shaft Seal

• Prevents manual transmission fluid leaks around the input shaft
• Reduces risk of contamination entering the transmission system
• Minimizes wear on transmission components caused by fluid loss
• Helps maintain proper lubrication for smooth gear operation
• Protects against premature transmission failure due to seal degradation

Installation Notes and Tips

When installing the National 223801 input shaft seal, ensure the transmission housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the shaft diameter matches the seal’s inside diameter of 1.496 inches for a proper fit. Lubricate the seal lip lightly with transmission fluid before installation to reduce initial wear. Follow vehicle-specific service manual instructions for torque specifications and assembly procedures.

Quality Assurance and Warranty Information

National’s 223801 input shaft seal is manufactured to meet industry standards for durability and performance. The nitrile material and precise dimensions contribute to long service life under normal operating conditions. This part is backed by National’s quality control processes and warranty coverage, providing confidence in its reliability for manual transmission repairs and maintenance.