National 3393 Engine Crankshaft Seal - Rear

Overview of National 3393 Engine Crankshaft Seal

The National 3393 engine crankshaft seal is designed to provide reliable sealing performance for various Ford, Land Rover, Mazda, and Mercury vehicles. Engineered with a fluoro-elastomer material and a counter-clockwise spiral lip design, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 2.375 inches (60.350 mm)
• Outside diameter: 3.013 inches (76.530 mm)
• Thickness/width: 0.400 inches (10.160 mm)
• Helix type: Counter-clockwise spiral lip design
• Material: Durable fluoro-elastomer for heat and chemical resistance
• Housing bore size: 3.000 inches (76.200 mm)
• Part type: Engine crankshaft oil seal, Series 3000

Technical Details and Material Specifications

The National 3393 crankshaft seal features a fluoro-elastomer construction, which offers enhanced resistance to high temperatures, oils, and automotive fluids commonly encountered in engine environments. The counter-clockwise spiral lip design improves sealing efficiency by directing contaminants away from the sealing surface, reducing wear and extending service life. With precise dimensions including a 2.375-inch inside diameter and a 3.013-inch outside diameter, this seal fits housing bores measuring approximately 3.000 inches, ensuring a secure and accurate fit.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of vehicles including Ford models such as the Aerostar, B4000, Bronco II, Capri, Explorer, Explorer Sport, Explorer Sport Trac, Mustang, Pinto, and Ranger. It also fits Land Rover LR3, Mazda B4000 and Navajo, Mercury Mountaineer, and Ford Fiesta and Bobcat models. The National 3393 seal is designed to maintain engine oil containment and prevent leaks in these specific applications.

Common Issues Addressed by National 3393 Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination ingress into the engine
• Minimizes premature wear of crankshaft bearings
• Maintains engine oil pressure and efficiency
• Helps avoid costly engine repairs due to seal failure

Installation Notes and Tips

When installing the National 3393 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 counter-clockwise spiral lip design for optimal performance. Lubricate the seal lip lightly with clean engine oil before installation to reduce initial wear during engine startup.

Quality Assurance and Warranty Information

National's Series 3000 engine crankshaft seals are manufactured to meet industry standards for durability and performance. The fluoro-elastomer material and precision engineering provide consistent sealing under demanding engine conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure product reliability and customer confidence.