National 225020 Engine Crankshaft Seal - Front

Overview of National 225020 Engine Crankshaft Seal

The National 225020 engine crankshaft seal is designed for reliable sealing performance in select Chevrolet, GMC, and Isuzu vehicles. Engineered with a fluoro-elastomer material and a clockwise-spiral lip design, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 1.969 inches (50.000 mm)
• Outside diameter: 2.688 inches (68.280 mm)
• Thickness/width: 0.354 inches (9.000 mm)
• Helix type: Clockwise-spiral lip design for effective sealing
• Material: Durable fluoro-elastomer resistant to heat and chemicals
• Housing bore size: 2.677 inches (68.000 mm)
• Part number: 225020, Series 220000

Technical Details and Specifications

This National crankshaft seal (part number 225020) features a 32-type design optimized for sealing the crankshaft in engines of Chevrolet, GMC, and Isuzu models such as the I-Mark, Impulse, LUV, Pickup, S10, S10 Blazer, S15, S15 Jimmy, and Trooper. The fluoro-elastomer material offers excellent resistance to high temperatures and engine fluids, ensuring long-lasting performance. The clockwise-spiral lip design enhances sealing efficiency by directing oil back into the engine, reducing leakage and contamination risks.

Compatible Vehicles and Applications

Compatible with various Chevrolet, GMC, and Isuzu models, this crankshaft seal is specifically suited for:

• Chevrolet S10 and S10 Blazer
• GMC S15 and S15 Jimmy
• Isuzu I-Mark, Impulse, LUV, Pickup, and Trooper

Using the correct seal like the National 225020 helps maintain engine oil integrity and prevents common issues related to crankshaft oil leaks.

Common Issues Addressed by the National 225020 Seal

• Prevents oil leaks around the crankshaft
• Reduces engine contamination from external debris
• Maintains proper oil pressure and lubrication
• Minimizes premature wear of engine components
• Helps avoid costly engine repairs due to oil loss

Installation Notes and Tips

• Ensure the housing bore is clean and free of debris before installation
• Verify the seal dimensions match the crankshaft and housing bore (1.969 inch shaft, 2.677 inch housing bore)
• Use proper tools to avoid damaging the seal during installation
• Apply a light coat of engine oil on the seal lip before fitting
• Check for proper seating and alignment to prevent leaks

Quality Assurance and Warranty

National's 225020 crankshaft seal is manufactured to meet industry standards for durability and performance. Constructed from high-quality fluoro-elastomer material, it offers resistance to heat, oil, and chemicals commonly found in engine environments. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects to ensure customer confidence in product reliability.