National 710602 Engine Crankshaft Seal - Rear

Overview of National 710602 Engine Crankshaft Seal

The National 710602 engine crankshaft seal is designed to provide reliable sealing performance for select Chevrolet, GMC, Hummer, and Isuzu vehicles. Engineered with precision dimensions and a counter-clockwise spiral lip design, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 3.228 inches (82.000 mm)
• Outside diameter: 3.798 inches (96.470 mm)
• Thickness/width: 0.354 inches (9.000 mm)
• Material: PTFE for enhanced durability and chemical resistance
• Helix type: Counter-clockwise spiral lip design for effective sealing
• Compatible housing bore: 3.790 inches (96.270 mm)
• Part number: 710602, Series 710600

Technical Details and Specifications

This National crankshaft seal (part number 710602) is constructed from PTFE material, known for its resistance to heat, chemicals, and wear. The seal features a counter-clockwise spiral lip design that ensures a tight fit around the crankshaft, reducing the risk of oil leakage. With an inside diameter of 3.228 inches and an outside diameter of 3.798 inches, it fits precisely into housings with a bore diameter of approximately 3.790 inches. The 0.354-inch thickness provides a robust barrier against contaminants while maintaining flexibility for installation.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with various models from Chevrolet, GMC, Hummer, and Isuzu, including Chevrolet Colorado and Canyon, GMC Canyon and Colorado, Hummer H3 and H3T, and Isuzu i-280, i-290, i-350, and i-370. The part number 710602 is specifically designed to meet the sealing requirements of these vehicles’ crankshaft assemblies.

Common Issues Addressed by the National 710602 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 crankshaft bearings caused by oil loss
• Helps avoid engine performance issues related to oil pressure drops

Installation Notes and Tips

When installing the National 710602 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 PTFE lip. Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing. Lubricate the seal lip lightly with engine oil before installation to reduce initial wear and facilitate proper seating.

Quality Assurance and Warranty

National engine seals are manufactured to meet industry standards for durability and performance. The 710602 crankshaft seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.