National 710603 Engine Crankshaft Seal - Rear

Overview of National 710603 Engine Crankshaft Seal

The National 710603 engine crankshaft seal is designed to provide reliable sealing performance for select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab vehicles. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 104.0 mm (4.094 inches)
• Outside diameter: 128.2 mm (5.047 inches)
• Thickness/width: 11.0 mm (0.433 inches)
• Material: Durable PTFE for enhanced wear resistance
• Helix type: Counter-clockwise spiral lip design for effective sealing
• Compatible housing bore: 128.0 mm (5.039 inches)
• Series: 710600

Technical Details and Material Specifications

This National crankshaft seal (part number 710603) features a PTFE (polytetrafluoroethylene) construction, which offers excellent chemical resistance and low friction properties. The counter-clockwise spiral lip design improves sealing efficiency by directing oil back into the engine, reducing leakage. With an inside diameter of 104 mm and an outside diameter of 128.2 mm, this seal fits shafts measuring 4.094 inches and housing bores around 5.039 inches, making it suitable for specific engine applications.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of vehicles including Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models. It is specifically designed for use in models such as the Buick Rainier, Chevrolet Trailblazer and Trailblazer EXT, GMC Envoy, Envoy XL, Envoy XUV, Isuzu Ascender, Oldsmobile Bravada, and Saab 9-7x. The National 710603 seal is ideal for maintaining engine oil containment in these vehicles.

Common Issues Addressed by the National 710603 Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination of engine oil by external debris
• Minimizes wear on the crankshaft and housing bore
• Maintains engine oil pressure and performance
• Helps avoid costly engine damage due to oil loss

Installation Notes and Tips

When installing the National 710603 crankshaft seal, ensure the housing bore and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into place 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 clean engine oil before installation to reduce initial wear.

Quality Assurance and Warranty

National engine seals are manufactured to meet strict quality standards, ensuring durability and reliable performance. The 710603 part is part of the 710600 series, known for consistent dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to support professional repair and maintenance needs.