National 710629 Automatic Transmission Output Shaft Seal - Left

Overview of National 710629 Automatic Transmission Output Shaft Seal

The National 710629 automatic transmission output shaft seal is engineered for reliable sealing performance in select Acura and Honda vehicles. Designed to maintain transmission fluid integrity, this oil seal supports smooth operation in models such as the Honda Civic, CR-Z, ILX, and Insight.

• Inside diameter: 1.378 inches (35.000 mm)
• Outside diameter: 3.000 inches (76.200 mm)
• Thickness: 0.315 inches (8.000 mm)
• Overall width with side lip: 0.453 inches (11.500 mm)
• Material: Polyacrylate for durability and resistance
• Helix type: Counter-clockwise spiral lip design for effective sealing
• Housing bore: 2.992 inches (76.000 mm)
• Part number: 710629

Technical Details and Design Features

The National 710629 output shaft seal features a counter-clockwise spiral lip design that enhances sealing efficiency by directing fluid back into the transmission housing. Constructed from polyacrylate material, this seal offers resistance to heat and transmission fluids, ensuring longevity under demanding conditions. The precise dimensions, including a 1.378-inch inside diameter and a 3.000-inch outside diameter, make it compatible with the specified Acura and Honda models. The overall width of 0.453 inches with side lip ensures a secure fit within the transmission housing bore of approximately 2.992 inches.

Compatible Vehicles and Applications

This automatic transmission output shaft seal is compatible with the following vehicles:

• Acura ILX
• Honda Civic
• Honda CR-Z
• Honda Insight

It is designed to maintain proper sealing in the transmission output shaft area, preventing fluid leaks and contamination.

Common Issues Addressed by Part Number 710629

• Prevents transmission fluid leaks from the output shaft
• Reduces risk of transmission contamination
• Maintains proper fluid pressure within the transmission
• Helps avoid premature transmission wear due to fluid loss
• Ensures smooth operation of the automatic transmission system

Installation Notes and Tips

• Ensure the transmission housing bore is clean and free of debris before installation
• Use appropriate tools to avoid damaging the seal during installation
• Verify the seal orientation matches the counter-clockwise spiral lip design
• Check shaft and bore dimensions to confirm compatibility with the 1.378-inch shaft diameter and 2.992-inch housing bore
• Apply a light coat of transmission fluid to the seal lip before installation to reduce initial wear

Quality Assurance and Warranty

National transmission seals are manufactured to meet industry standards for durability and performance. The 710629 output shaft seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to support professional repair and maintenance needs.