National 710890 Engine Crankshaft Seal - Front

Reliable Engine Crankshaft Seal for Ford Super Duty and E-Series

The National 710890 engine crankshaft seal is designed to provide a durable and precise fit for select Ford vehicles. Engineered with fluoro-elastomer material, this oil seal ensures effective sealing performance for models like the Ford E-350 Club Wagon and F-350 Super Duty.

• Inside diameter: 2.146 inches (54.508 mm)
• Outside diameter: 3.239 inches (82.271 mm)
• Thickness/width: 0.600 inches (15.240 mm)
• Housing bore diameter: 3.228 inches (81.991 mm)
• Constructed from high-quality fluoro-elastomer for heat and chemical resistance
• Part number 710890, part of the National 710800 series

Detailed Product Description and Specifications

This National engine crankshaft seal (part number 710890) is manufactured to meet the precise dimensions required for proper sealing on Ford heavy-duty trucks and vans. The seal features an inside diameter of 2.146 inches (54.508 mm) to fit the crankshaft shaft diameter, while the outside diameter measures 3.239 inches (82.271 mm) to fit securely within the housing bore of 3.228 inches (81.991 mm). The thickness of 0.600 inches (15.240 mm) ensures adequate sealing surface and durability under engine operating conditions.

Constructed from fluoro-elastomer, this oil seal offers resistance to high temperatures, oils, and other automotive fluids, making it suitable for demanding engine environments. It is designed specifically for Ford models including the E-350 Club Wagon, E-350 Super Duty, Excursion, F-250 Super Duty, and F-350 Super Duty, ensuring compatibility and reliable performance.

Common Applications and Problem Solving

• Prevents oil leaks around the crankshaft area
• Maintains engine oil pressure and cleanliness
• Reduces risk of engine contamination from external debris
• Helps avoid premature engine wear due to oil loss
• Ensures proper sealing in Ford E-350 and F-Series Super Duty engines

Installation Notes and Tips

When installing the National 710890 crankshaft seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Verify the seal orientation matches the engine manufacturer’s specifications to maintain optimal sealing performance. Avoid using excessive force or sharp tools during installation to prevent seal damage.

Quality Assurance and Warranty

National engine seals are manufactured to meet industry standards for durability and performance. The fluoro-elastomer material provides resistance to heat and chemical exposure typical in engine environments. While specific warranty details are not provided, National products are generally backed by quality control processes to ensure fit and function for the specified Ford models.