National 710617 Engine Crankshaft Seal - Rear

Overview of National 710617 Engine Crankshaft Seal

The National 710617 engine crankshaft seal is designed for reliable sealing performance in select Audi and Volkswagen models. Engineered with precision, this oil seal helps maintain engine integrity by preventing oil leaks around the crankshaft.

• Inside diameter: 85 mm (3.346 inches)
• Outside diameter: 131.4 mm (5.173 inches)
• Flanged outside diameter: 153 mm (6.024 inches)
• Thickness: 16 mm (0.630 inches)
• Material: PTFE for enhanced durability and chemical resistance
• Counter-clockwise spiral lip design for effective sealing
• Compatible with housing bore of 131 mm (5.157 inches)

Technical Details and Design Features

This National 710617 crankshaft seal features a PTFE (polytetrafluoroethylene) construction, providing excellent resistance to heat, chemicals, and wear. The counter-clockwise spiral lip design improves oil retention and reduces the risk of leakage under varying engine conditions. With a flanged outside diameter of 153 mm, it fits securely within the housing bore of 131 mm, ensuring a tight seal around the crankshaft. The seal’s dimensions are optimized for shafts measuring 85 mm in diameter, making it suitable for specific Audi and Volkswagen engines.

Compatible Vehicles and Applications

This engine crankshaft seal is compatible with a range of Audi and Volkswagen models, including the Audi A3, A4, A4 Quattro, A5, A5 Quattro, RS3, and Volkswagen Beetle, Cabrio, Golf, Golf City, Golf SportWagen, GTI, Jetta, Jetta City, Passat, and Tiguan. The part number 710617 ensures precise fitment for these vehicles, supporting proper engine sealing and performance.

Common Issues Addressed by the National 710617 Seal

• Prevents oil leaks around the crankshaft area
• Reduces contamination of engine oil by external debris
• Maintains engine oil pressure and lubrication efficiency
• Minimizes wear on crankshaft bearings due to oil loss
• Helps avoid costly engine repairs related to seal failure

Installation Notes and Tips

When installing the National 710617 crankshaft seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to avoid damaging the PTFE lip during installation. Verify the seal orientation matches the counter-clockwise spiral lip design for optimal sealing. It is recommended to inspect the crankshaft and housing for wear or damage before installation to ensure a proper fit and long service life.

Quality Assurance and Warranty

National manufactures the 710617 crankshaft seal to meet industry standards for durability and performance. The use of PTFE material and precision engineering supports consistent sealing under demanding engine conditions. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, providing confidence in the product’s reliability.