National 710399 Engine Crankshaft Seal - Front

Reliable Engine Crankshaft Seal for Buick, Chevrolet, and Pontiac

The National 710399 engine crankshaft seal is designed to provide a durable and precise fit for select Buick, Chevrolet, and Pontiac models. Engineered with fluoro-elastomer material and a clockwise-spiral lip design, this oil seal ensures effective sealing and long-lasting performance.

• Inside diameter: 1.024 inches (26.000 mm)
• Outside diameter: 1.662 inches (42.200 mm)
• Thickness/width: 0.315 inches (8.000 mm)
• Helix type: Clockwise-spiral lip design for enhanced sealing
• Material: High-quality fluoro-elastomer for heat and chemical resistance
• Housing bore size: 1.654 inches (42.000 mm)
• Part number: 710399, part of the National 710300 series

Technical Details and Material Specifications

This National engine crankshaft seal (part number 710399) is constructed from fluoro-elastomer, a material known for its resistance to heat, oil, and chemicals commonly found in engine environments. The seal features a clockwise-spiral lip design that helps maintain a tight seal around the crankshaft, preventing oil leaks and contamination. With an inside diameter of 1.024 inches and an outside diameter of 1.662 inches, it fits precisely within the housing bore of 1.654 inches, ensuring optimal sealing performance. The 0.315-inch thickness provides durability without compromising flexibility.

Compatible Vehicles and Applications

This crankshaft seal is compatible with various Buick, Chevrolet, and Pontiac models, including the Aveo, Aveo5, Cascada, G3, LeMans, Optima, Wave, and Wave5. It is specifically designed to replace worn or damaged seals in these vehicles, maintaining engine integrity and preventing oil leaks.

• Prevents oil leaks from the crankshaft area
• Protects engine components from dirt and contaminants
• Maintains proper oil pressure and engine performance
• Reduces risk of engine damage due to seal failure

Installation Notes and Tips

When installing the National 710399 crankshaft seal, ensure the housing bore and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the lip or material. Verify the seal orientation matches the clockwise-spiral lip design for correct installation. It is recommended to inspect the crankshaft surface for wear or damage before installation to ensure a proper seal.

Quality Assurance and Warranty

National's 710399 crankshaft seal is manufactured to meet industry standards for durability and performance. The fluoro-elastomer material and precise dimensions contribute to reliable sealing under typical engine operating conditions. This part is backed by National's quality assurance processes, providing confidence in its fit and function for compatible Buick, Chevrolet, and Pontiac models.