National 710867 Automatic Transmission Oil Pump Seal - Front

Overview of National 710867 Automatic Transmission Oil Pump Seal

The National 710867 automatic transmission oil pump seal is engineered to provide reliable sealing performance for select BMW, Cadillac, Land Rover, Pontiac, and Saturn models. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain transmission fluid integrity and prevent leaks.

• Inside diameter options: 1.750 inch (44.450 mm)
• Outside diameter: 2.764 inch (70.200 mm)
• Flanged outside diameter: 3.189 inch (81.000 mm)
• Thickness: 0.252 inch (6.400 mm)
• Clockwise-spiral lip design for enhanced sealing
• Material: Fluoro-elastomer for chemical and heat resistance
• Compatible housing bore: 2.756 inch (70.000 mm)
• Overall width with side lip: 0.315 inch (8.000 mm)

Technical Details and Material Specifications

The National 710867 oil seal features a fluoro-elastomer sealing material known for its resistance to high temperatures and transmission fluids, ensuring durability in demanding operating conditions. The seal’s clockwise-spiral lip design improves sealing efficiency by maintaining consistent contact with the shaft, which measures 1.750 inches (44.450 mm) in diameter. The flanged outside diameter of 3.189 inches (81.000 mm) provides a secure fit within the transmission housing bore of 2.756 inches (70.000 mm). With a thickness of 0.252 inches (6.400 mm) and an overall width including the side lip of 0.315 inches (8.000 mm), this seal is engineered to meet precise OEM specifications.

Compatible Vehicles and Applications

This automatic transmission oil pump seal is compatible with a range of vehicles, including BMW 323i, 325i, 328Ci, 328i, 330Ci, 528i, and Z3, Z4 models. It also fits Cadillac CTS, SRX, STS, and XLR models, Land Rover Range Rover, Pontiac G8 and Solstice, as well as Saturn Sky. The part number 710867 ensures correct identification for these specific applications.

Common Issues Addressed by the National 710867 Seal

• Prevents automatic transmission fluid leaks around the oil pump shaft
• Reduces risk of contamination entering the transmission system
• Maintains proper hydraulic pressure within the transmission
• Minimizes premature wear of transmission components due to fluid loss
• Helps avoid costly transmission repairs related to seal failure

Installation Notes and Tips

Ensure the transmission housing bore and shaft are clean and free of debris before installing the seal. Use appropriate tools to press the seal evenly into the housing bore without damaging the flanged outside diameter or sealing lip. Verify the seal’s orientation matches the clockwise-spiral lip design for optimal sealing performance. Avoid using excessive force during installation to prevent distortion of the fluoro-elastomer material.

Quality Assurance and Warranty

National transmission seals are manufactured to meet industry standards for durability and performance. The 710867 oil pump seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically conform to OEM quality requirements, supporting reliable service life in compatible BMW, Cadillac, Land Rover, Pontiac, and Saturn vehicles.