National 228250 Engine Crankshaft Seal - Rear

Overview of National Engine Crankshaft Seal 228250

The National 228250 engine crankshaft seal is designed to provide reliable sealing performance for various Ford, Kia, Mazda, and Mercury vehicles. Engineered with a fluoro-elastomer material and a counter-clockwise-spiral lip design, this oil seal ensures effective protection against oil leaks and contaminants.

• Inside diameter: 3.268 inches (83.000 mm)
• Outside diameter: 3.945 inches (100.200 mm)
• Thickness/width: 0.354 inches (9.000 mm)
• Material: Durable fluoro-elastomer for heat and chemical resistance
• Helix type: Counter-clockwise spiral lip design for enhanced sealing
• Compatible housing bore: 3.937 inches (100.000 mm)
• Part number: 228250, Series 220000

Technical Details and Material Specifications

This National engine crankshaft seal (part number 228250) is constructed from fluoro-elastomer, a material known for its resistance to high temperatures, oils, and chemicals commonly found in engine environments. The seal features a counter-clockwise spiral lip design that improves sealing efficiency by maintaining consistent contact with the crankshaft, reducing the risk of oil leakage. With an inside diameter of 3.268 inches and an outside diameter of 3.945 inches, it fits precisely into housings with a bore size of approximately 3.937 inches, ensuring a secure and tight fit.

Compatible Vehicles and Applications

This crankshaft seal is compatible with a range of vehicles including Ford Aspire, Capri, Escort, and Tracer models; Kia Rio and Sephia; Mazda Miata, MX-3, and Protege; as well as Mercury Capri and Tracer. The National 228250 seal is suitable for engine applications requiring a 32-type oil seal with the specified dimensions, making it a reliable replacement part for maintaining engine integrity.

Common Issues Addressed by the National 228250 Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination from dirt and debris entering the engine
• Maintains proper lubrication by sealing oil within the engine
• Minimizes wear on the crankshaft and surrounding components
• Helps avoid engine performance issues related to oil loss

Installation Notes and Tips

When installing the National 228250 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 lip or seal body. Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing performance. Lubricate the seal lip lightly with engine oil before installation to reduce initial wear and facilitate proper seating.

Quality Assurance and Warranty

National engine crankshaft seals are manufactured to meet industry standards for durability and performance. The fluoro-elastomer material and precision design contribute to long service life under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the 228250 part.