National 6840S Wheel Seal - Front Inner

National 6840S Wheel Seal Overview

The National 6840S wheel seal is engineered for reliable sealing performance in driveline and axle applications. Designed specifically for Chrysler and Dodge vehicles, including models like the Charger, Challenger, and Town & Country, this oil seal helps maintain proper lubrication and prevent contamination.

• Inside diameter: 1.730 inches (43.940 mm)
• Outside diameter: 2.340 inches (59.440 mm)
• Housing bore diameter: 2.336 inches (59.330 mm)
• Width: 0.250 inches (6.350 mm)
• Material: durable nitrile rubber
• Series: 6000, Type: 4s

Technical Details and Specifications

The National 6840S wheel seal is constructed from nitrile, a material known for its resistance to oil, heat, and wear, making it suitable for demanding automotive environments. The seal features a 1.730-inch (43.940 mm) inside diameter to fit the shaft precisely, while the 2.340-inch (59.440 mm) outside diameter ensures a secure fit within the housing bore of 2.336 inches (59.330 mm). With a width of 0.250 inches (6.350 mm), this oil seal is designed to maintain a tight barrier against contaminants and retain lubricants effectively. The 6000 series and 4s type classification indicate its compatibility with specific axle and driveline configurations commonly found in Chrysler and Dodge vehicles.

Compatible Vehicles and Applications

This wheel seal is compatible with a range of Chrysler and Dodge models, including the 300, Challenger, Charger, Dart, Lancer, Monaco, Newport, New Yorker, and Town & Country. The National 6840S is ideal for use in driveline and axle assemblies where maintaining oil integrity and preventing dirt ingress is critical.

• Prevents oil leaks in wheel hubs and axle assemblies
• Protects bearings from dirt and moisture contamination
• Maintains proper lubrication for driveline components
• Reduces wear and extends component life
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

When installing the National 6840S wheel seal, ensure the shaft and housing bore are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Lubricate the seal lip lightly with compatible oil before installation to reduce initial wear. Verify the seal orientation matches the original part to maintain proper sealing function.

Quality Assurance and Warranty

National wheel seals are manufactured to meet industry standards for durability and performance. The 6840S part number undergoes rigorous quality control to ensure consistent dimensions and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in the product's reliability.