National 7486S Engine Crankshaft Seal - Front

Overview of National 7486S Engine Crankshaft Seal

The National 7486S engine crankshaft seal is designed to provide reliable sealing performance for select Ford and Mercury vehicles. Engineered with nitrile material, this oil seal ensures effective protection against oil leaks and contamination in the crankshaft area.

• Inside diameter: 1.750 inches (44.450 mm)
• Outside diameter: 2.381 inches (60.480 mm)
• Thickness/width: 0.437 inches (11.100 mm)
• Housing bore size: 2.374 inches (60.300 mm)
• Material: durable nitrile rubber for oil resistance
• Part number: 7486S
• Series: 7000

Detailed Product Description

The National 7486S crankshaft seal is part of the 7000 series, crafted to maintain a tight seal around the crankshaft, preventing oil leakage and protecting engine components from dirt and debris. Its nitrile construction offers resistance to heat, oil, and wear, making it suitable for the demanding environment of engine operation. The seal’s precise dimensions, including a 1.750-inch inside diameter and 2.381-inch outside diameter, ensure a proper fit within the housing bore of 2.374 inches, providing a secure and effective seal.

Compatible Vehicles and Applications

This crankshaft seal is compatible with a range of Ford and Mercury models, including:

• Ford Bronco
• Ford Capri
• Ford Cougar
• Ford E-100 Econoline and Econoline series
• Ford Fairmont
• Ford LTD
• Ford Marquis
• Mercury Monarch
• Mercury Montego
• Ford Mustang
• Ford Thunderbird
• Mercury Villager
• Mercury Zephyr

Using the National 7486S ensures compatibility and proper sealing performance for these specific models.

Common Issues Addressed by the National 7486S Seal

• Prevents oil leaks around the crankshaft area
• Protects engine components from dirt and contaminants
• Reduces risk of engine damage due to oil loss
• Maintains engine oil pressure and efficiency
• Minimizes wear on crankshaft bearings

Installation Notes and Tips

When installing the National 7486S crankshaft seal, ensure the housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the seal’s orientation matches the engine manufacturer’s specifications to maintain optimal sealing performance. Lubricate the seal lip lightly with clean engine oil before installation to reduce initial wear.

Quality Assurance and Warranty

National manufactures the 7486S crankshaft seal to meet industry standards for durability and performance. The nitrile material and precise dimensions contribute to consistent sealing reliability. While specific warranty details are not provided, National products typically adhere to quality control processes to ensure fit and function for the listed Ford and Mercury applications.