National 5277 Engine Crankshaft Seal - Rear

Overview of National 5277 Engine Crankshaft Seal

The National 5277 engine crankshaft seal is designed to provide reliable sealing performance for various vehicle models including Ford, Jaguar, and Lincoln. Engineered with PTFE material, this oil seal kit ensures durability and effective protection against oil leaks in critical engine components.

• Inside diameter: 3.625 inches (92.080 mm)
• Outside diameter: 4.256 inches (108.100 mm)
• Thickness/width: 0.390 inches (9.910 mm)
• Material: PTFE for enhanced wear resistance
• Type: Fw-h style seal

Detailed Product Description and Specifications

The National 5277 crankshaft seal is manufactured from PTFE, a material known for its chemical resistance and low friction properties, making it suitable for demanding engine environments. With an inside diameter of 3.625 inches and an outside diameter of 4.256 inches, this seal fits shafts measuring 3.625 inches (92.080 mm) in diameter. The 0.390-inch thickness provides a secure fit to prevent oil leakage around the crankshaft. This Fw-h type seal is designed to maintain engine integrity by effectively sealing the crankshaft area, reducing the risk of contamination and fluid loss.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of vehicles from manufacturers such as Aston Martin, Ford, Jaguar, Lincoln, Mazda, and Mercury. It is suitable for models including the Ford F-150, Explorer, Mustang, Lincoln Navigator, Jaguar S-Type, and Aston Martin DB9, among others. The National 5277 is ideal for those seeking a replacement oil seal kit for these specific makes and models.

Common Issues Addressed by the National 5277 Seal

• Prevents oil leaks around the crankshaft area
• Reduces engine contamination from external debris
• Maintains proper lubrication by sealing oil within the engine
• Minimizes wear on crankshaft bearings
• Helps avoid costly engine repairs due to seal failure

Installation Notes and Tips

When installing the National 5277 crankshaft seal, ensure the shaft and housing surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the PTFE material. Verify the seal orientation matches the Fw-h type specifications to maintain proper sealing function. It is recommended to inspect the crankshaft for wear or damage before installation to ensure optimal performance.

Quality Assurance and Warranty

National engine seals are manufactured to meet industry standards for durability and performance. The 5277 part number undergoes rigorous quality control to ensure consistent dimensions and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product's reliability.