National 3051N Engine Crankshaft Seal - Front or Upper

Overview of National 3051N Engine Crankshaft Seal

The National 3051N engine crankshaft seal is designed to provide reliable sealing performance for various vehicle models including Mazda, Mercury, Saab, Subaru, and Volkswagen. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 1.654 inches (42.000 mm)
• Outside diameter: 2.170 inches (55.120 mm)
• Thickness: 0.315 inches (8.000 mm)
• Sealing material: Durable silicone
• Clockwise-spiral lip design for enhanced sealing
• Compatible housing bore: 2.165 inches (55.000 mm)
• Part type: Engine crankshaft oil seal
• Series: 3000

Detailed Product Description

The National 3051N crankshaft seal is constructed from high-quality silicone material, offering excellent resistance to heat, oil, and wear. Its clockwise-spiral lip design ensures a tight seal around the crankshaft, reducing the risk of oil leakage and contamination. With precise dimensions including a 1.654-inch inside diameter and a 2.170-inch outside diameter, this seal fits securely within the housing bore of 2.165 inches. The 0.315-inch thickness provides durability and long-lasting performance under demanding engine conditions.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of vehicles, including:

• Mazda 9-2X
• Mercury Mountaineer and B4000
• Saab 9-2X
• Subaru Baja, Forester, Impreza, Legacy, Outback, WRX STI
• Volkswagen Vanagon

It is specifically designed to maintain engine oil containment and prevent leaks in these models, ensuring optimal engine performance.

Common Issues Addressed by National 3051N Seal

• Prevents oil leaks around the crankshaft
• Reduces engine contamination from external debris
• Minimizes wear on crankshaft and housing bore
• Maintains engine oil pressure and efficiency
• Helps avoid costly engine repairs due to seal failure

Installation Notes and Tips

When installing the National 3051N crankshaft seal, ensure the housing bore and crankshaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the seal orientation matches the clockwise-spiral lip design for proper function. Follow vehicle-specific service manual instructions for torque specifications and installation procedures.

Quality Assurance and Warranty

Manufactured by National, a trusted name in engine sealing systems, the 3051N crankshaft seal meets industry standards for durability and performance. The silicone material and design features contribute to a reliable seal under normal operating conditions. Warranty information is provided by the manufacturer and should be referenced for specific coverage details.