National 100470 Engine Crankshaft Seal - Front

Overview of National Engine Crankshaft Seal 100470

The National Engine Crankshaft Seal part number 100470 is designed to provide reliable sealing performance for various GM and related vehicles. Engineered with PTFE material, this oil seal ensures durability and effective containment of engine fluids, helping maintain engine integrity in models like the Chevrolet Silverado and Cadillac Escalade.

• Inside diameter: 2.129 inches (54.080 mm)
• Outside diameter: 2.846 inches (72.290 mm)
• Thickness/width: 0.323 inches (8.200 mm)
• Material: PTFE for enhanced wear resistance
• Compatible with multiple GM makes and models

Technical Specifications and Material Details

This National crankshaft seal features a precise inside diameter of 2.129 inches, matching the shaft size for a secure fit. The outside diameter measures 2.846 inches, designed to fit housing bores around 2.835 inches (72.010 mm). With a thickness of 0.323 inches, the seal balances flexibility and strength. Constructed from PTFE, the seal offers excellent resistance to heat, chemicals, and wear, making it suitable for demanding engine environments.

Compatible Vehicles and Applications

The National 100470 crankshaft seal is compatible with a wide range of vehicles including Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Pontiac, and Saab. Specific models supported include Chevrolet Silverado 1500, Cadillac Escalade, GMC Sierra 2500 HD, Hummer H2, and Pontiac G8 among others. This seal is ideal for engine maintenance and repair tasks requiring a reliable crankshaft oil seal replacement.

• Prevents oil leaks around the crankshaft
• Maintains engine oil pressure and cleanliness
• Reduces risk of engine contamination
• Helps avoid premature engine wear
• Supports proper engine performance and longevity

Installation Notes and Tips

When installing the National 100470 crankshaft seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the PTFE material. Verify the seal orientation matches the engine specifications to prevent leaks. Proper installation will help maintain the seal’s effectiveness and extend engine service intervals.

Quality Assurance and Warranty Information

National manufactures this crankshaft seal to meet industry standards for durability and performance. The use of PTFE material provides enhanced resistance to wear and chemical exposure. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, ensuring confidence in the part’s quality and reliability.