National 710619 Automatic Transmission Extension Housing Seal

Overview of National 710619 Automatic Transmission Extension Housing Seal

The National 710619 automatic transmission extension housing seal is engineered for reliable sealing performance in select BMW and Mini models. Designed with precision dimensions and durable ethylene-acrylic material, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.496 inches (38.000 mm)
• Outside diameter: 2.291 inches (58.200 mm)
• Thickness/width: 0.394 inches (10.000 mm)
• Bi-directional lip design for effective sealing
• Material: Ethylene-acrylic for durability and resistance
• Compatible with housing bore size of 2.283 inches (58.000 mm)

Detailed Product Description

The National 710619 is an automatic transmission extension housing seal specifically designed to fit a range of BMW and Mini vehicles, including models such as the BMW 318i, 320i, 325i, 328i, 525i, and Mini Cooper variants like the Cooper Clubman and Countryman. This seal features a bi-directional lip design that provides effective sealing against transmission fluid leaks in both rotational directions, enhancing the longevity of the transmission assembly.

Constructed from ethylene-acrylic material, the seal offers resistance to heat, oil, and wear, which is critical for maintaining a secure seal under demanding operating conditions. The precise dimensions—1.496 inch inside diameter, 2.291 inch outside diameter, and 0.394 inch thickness—ensure a proper fit within the transmission extension housing bore of 2.283 inches, minimizing the risk of leaks and contamination.

Common Applications and Issues Addressed

• Prevents automatic transmission fluid leaks in BMW 318i, 325i, and 328i models
• Seals transmission extension housing on Mini Cooper, Cooper Clubman, and Cooper Countryman
• Reduces risk of contamination entering the transmission system
• Helps maintain proper transmission fluid pressure and performance
• Addresses wear-related seal degradation and fluid seepage

Installation Notes and Tips

• Ensure the transmission extension 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 bi-directional lip design for optimal sealing
• Check shaft and bore dimensions to confirm compatibility with the 710619 seal
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

National transmission seals are manufactured to meet OEM specifications, ensuring reliable fit and function. The 710619 seal undergoes rigorous quality control to maintain dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to support professional repair standards.