National 714598 Automatic Transmission Oil Pump Seal - Front

Overview of National 714598 Automatic Transmission Oil Pump Seal

The National 714598 automatic transmission oil pump seal is engineered to provide reliable sealing performance for a range of heavy-duty and luxury vehicles. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transmission fluid integrity in models such as the Chevrolet Silverado 2500 and the Bentley Arnage.

• Inside diameter options: 1.998 inch (50.749 mm)
• Outside diameter: 2.882 inch (73.200 mm)
• Flanged outside diameter: 3.165 inch (80.390 mm)
• Thickness: 0.340 inch (8.640 mm)
• Sealing material: Polyacrylate with clockwise-spiral lip design
• Redicoat surface treatment for enhanced durability
• Compatible with housing bore of 2.878 inch (73.100 mm)

Technical Details and Material Specifications

This oil pump seal from National is constructed from polyacrylate, a material known for its resistance to heat and transmission fluids. The clockwise-spiral lip design (helix type) ensures effective sealing under dynamic conditions, reducing the risk of leaks. The seal’s flanged outside diameter of 3.165 inches (80.390 mm) provides a secure fit within the transmission housing bore, which measures 2.878 inches (73.100 mm). The 0.340 inch (8.640 mm) thickness balances durability with flexibility, accommodating slight shaft movements without compromising the seal.

Compatible Vehicles and Applications

This National 714598 oil seal is compatible with a variety of vehicles, including:

• Bentley Arnage and Continental models
• Cadillac Escalade, Escalade ESV, and Escalade EXT
• Chevrolet Avalanche 2500, Silverado 1500, 2500, and 3500 series
• GMC Sierra 1500, 2500, and 3500 series
• Hummer H1
• Rolls-Royce Corniche and Park Ward
• Various GMC and Chevrolet Express and Savana 2500/3500 models

Common Issues Addressed by the 714598 Oil Pump Seal

• Prevents automatic transmission fluid leaks around the oil pump shaft
• Reduces contamination ingress into the transmission system
• Maintains proper fluid pressure for transmission operation
• 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. The flanged design requires careful alignment to avoid damage during installation. Use appropriate tools to press the seal evenly into place without distorting the lip. Verify the clockwise-spiral lip orientation matches the direction of shaft rotation for optimal sealing performance.

Quality Assurance and Warranty

National’s 714598 oil pump seal is manufactured to meet OEM specifications for fit and function. The Redicoat treatment enhances corrosion resistance and extends service life. While specific warranty details are not provided, National products typically adhere to industry standards for durability and reliability in transmission sealing applications.