National 350414 Manual Transmission Input Shaft Seal

Overview of National 350414 Manual Transmission Input Shaft Seal

The National 350414 manual transmission input shaft seal is engineered to provide reliable sealing performance for manual transmissions. Designed with precision nitrile material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Inside diameter: 1.000 inch (25.4 mm)
• Outside diameter: 1.445 inch (36.7 mm)
• Thickness/width: 0.250 inch (6.35 mm)
• Sealing material: durable nitrile for resistance to oil and heat
• Housing bore compatibility: 1.437 inch (36.5 mm)

Technical Details and Material Specifications

The National 350414 input shaft seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and high temperatures commonly found in automotive transmissions. The seal’s 1.000 inch (25.4 mm) inside diameter fits standard manual transmission input shafts, while the 1.445 inch (36.7 mm) outside diameter ensures a secure fit within the housing bore of approximately 1.437 inches (36.5 mm). With a thickness of 0.250 inch (6.35 mm), this seal provides a robust barrier against fluid leakage and external contaminants.

Applications and Common Issues Addressed

This manual transmission input shaft seal is compatible with a range of vehicles requiring a 1-inch input shaft seal, including many domestic and import manual transmissions. It is commonly used in applications where maintaining transmission fluid integrity is critical.

• Prevents transmission fluid leaks from the input shaft area
• Protects internal transmission components from dirt and debris
• Reduces risk of premature transmission wear due to contamination
• Helps maintain proper lubrication within the transmission
• Minimizes potential for seal failure caused by heat and oil exposure

Installation Notes and Tips

When installing the National 350414 input shaft seal, ensure the transmission input shaft and housing bore are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Lubricate the seal lip lightly with transmission fluid before installation to reduce initial wear. Verify the seal is seated flush and properly aligned to avoid leaks.

Quality Assurance and Warranty Information

National manufactures the 350414 input shaft seal to meet industry standards for durability and performance. The nitrile material and precise dimensions ensure consistent sealing under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, providing confidence in the product’s reliability.