National 710721 Automatic Transmission Extension Housing Seal

Overview of National 710721 Automatic Transmission Extension Housing Seal

The National 710721 automatic transmission extension housing seal is engineered to provide reliable sealing performance for Acura and Honda vehicles. Designed specifically for models like the Accord Crosstour, MDX, Pilot, RDX, and Ridgeline, this seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.496 inches (38.000 mm)
• Outside diameter: 2.449 inches (62.200 mm)
• Thickness: 0.354 inches (9.000 mm)
• Sealing material: Polyacrylate for durability and resistance
• Bi-directional lip design for effective sealing under varying pressures
• Overall width with side lip: 0.531 inches (13.500 mm)
• Housing bore compatibility: 2.441 inches (62.000 mm)

Detailed Product Description

The National 710721 seal is constructed from polyacrylate, a material known for its excellent resistance to heat, oil, and wear, making it suitable for demanding transmission environments. Its bi-directional lip design ensures a secure seal around the automatic transmission extension housing, preventing fluid leakage in both rotational directions. With precise dimensions including a 1.496-inch inside diameter and a 2.449-inch outside diameter, this seal fits tightly within the housing bore of 2.441 inches, ensuring optimal performance and longevity.

Compatible Vehicles and Applications

This automatic transmission extension housing seal is compatible with a range of Acura and Honda models, including:

• Acura MDX
• Acura RDX
• Honda Accord Crosstour
• Honda Crosstour
• Honda Pilot
• Honda Ridgeline

Part number 710721 is designed to meet the specifications required for these vehicles, ensuring proper fit and function.

Common Issues Addressed by This Seal

• Prevents automatic transmission fluid leaks from the extension housing
• Reduces contamination of transmission components by sealing out dirt and debris
• Maintains proper fluid pressure within the transmission system
• Helps avoid premature wear of transmission parts due to fluid loss
• Ensures smooth operation of the transmission by maintaining a secure seal

Installation Notes and Tips

When installing the National 710721 seal, ensure the housing bore is clean and free of debris to prevent damage to the seal. Use appropriate tools to press the seal evenly into place without distortion. Verify the seal’s orientation matches the bi-directional lip design for optimal sealing performance. It is recommended to inspect the shaft and housing surfaces for wear or damage before installation to ensure a proper fit.

Quality Assurance and Warranty

National manufactures the 710721 seal to meet industry standards for durability and performance. The polyacrylate material and precise engineering contribute to a reliable sealing solution for Acura and Honda automatic transmissions. While specific warranty details are not provided, National products typically adhere to strict quality control processes to ensure consistent product reliability.