National 710901 Engine Crankshaft Seal - Rear

Overview of National 710901 Engine Crankshaft Seal

The National 710901 engine crankshaft seal is designed to provide reliable sealing performance for select Ford vehicles. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 4.646 inches (118.008 mm)
• Outside diameter: 5.762 inches (146.355 mm)
• Thickness/width: 0.750 inches (19.050 mm)
• Material: Durable PTFE for enhanced wear resistance
• Helix type: Clockwise-spiral lip design for effective sealing
• Housing bore diameter: 5.748 inches (145.999 mm)
• Compatible with Ford E-350 Club Wagon, E-350 Super Duty, Excursion, F-250 Super Duty, and F-350 Super Duty

Detailed Product Description

The National 710901 crankshaft seal is part of the 710900 series, crafted from PTFE material known for its chemical resistance and durability under high temperatures. Its 4.646-inch inside diameter and 5.762-inch outside diameter ensure a precise fit for the crankshaft and housing bore, which measures approximately 5.748 inches. The 0.750-inch thickness provides a robust sealing surface, while the clockwise-spiral lip design enhances oil retention and reduces leakage risks. This seal is specifically engineered for Ford heavy-duty 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 in demanding engine environments.

Common Applications and Problem Solving

• Prevents oil leaks around the crankshaft in Ford E-350 and F-Series Super Duty engines
• Reduces contamination ingress to protect engine components
• Maintains engine oil pressure by sealing the crankshaft housing
• Addresses wear-related seal failures in heavy-duty Ford trucks and vans
• Helps avoid costly engine repairs caused by oil leakage and contamination

Installation Notes and Tips

Ensure the crankshaft and housing bore are clean and free of debris before installation. Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing. Use appropriate tools to press the seal evenly into the housing bore to avoid damage. Check for proper fitment with the Ford model and part number 710901 to confirm compatibility.

Quality Assurance and Warranty

National manufactures the 710901 crankshaft seal to meet industry standards for durability and performance. The PTFE material and precision engineering contribute to long service life under typical operating conditions. Warranty details should be confirmed with the product documentation or supplier, as they may vary.