National 710739 Manual Transmission Output Shaft Seal - Right

Overview of National 710739 Manual Transmission Output Shaft Seal

The National 710739 manual transmission output shaft seal is engineered to provide reliable sealing performance for select Subaru models. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transmission integrity by preventing fluid leaks.

• Inside diameter: 1.378 inches (35.000 mm)
• Outside diameter: 1.976 inches (50.200 mm)
• Thickness: 0.354 inches (9.000 mm)
• Overall width with side lip: 0.591 inches (15.000 mm)
• Clockwise-spiral lip design for effective sealing
• Material: Polyacrylate for resistance to heat and wear
• Housing bore size: 1.969 inches (50.000 mm)

Detailed Product Description and Specifications

The National 710739 output shaft seal is part of the 710700 series and is specifically designed for manual transmissions. Its polyacrylate construction offers durability and resistance to transmission fluids and high temperatures. The seal features a clockwise-spiral lip design that enhances sealing efficiency by maintaining consistent contact with the shaft, reducing the risk of leaks. With precise inside and outside diameters, this seal fits tightly within the housing bore of 1.969 inches (50.000 mm), ensuring a secure fit on shafts measuring 1.378 inches (35.000 mm) in diameter.

Compatible Subaru Models and Applications

This output shaft seal is compatible with a range of Subaru vehicles, including the B9 Tribeca, Crosstrek, Forester, Impreza, Legacy, Outback, WRX, WRX STI, and XV Crosstrek. It is designed to replace worn or damaged seals in manual transmission systems, helping to maintain proper fluid retention and transmission performance.

Common Issues Addressed by the National 710739 Seal

• Prevents manual transmission fluid leaks from the output shaft area
• Reduces contamination of transmission internals by dirt and debris
• Minimizes wear on transmission components caused by fluid loss
• Helps maintain proper transmission pressure and lubrication
• Prevents premature transmission failure due to seal degradation

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 clockwise-spiral lip design for optimal sealing
• Check shaft diameter and housing bore dimensions to confirm compatibility
• Apply a light coating of transmission fluid to the seal lip before installation to reduce initial wear

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet industry standards for durability and performance. The 710739 seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.