National 8594S Wheel Seal - Rear

Overview of National 8594S Wheel Seal for Classic GM Vehicles

The National 8594S wheel seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed specifically for select Buick, Oldsmobile, and Pontiac models, this oil seal helps maintain proper lubrication and prevent contamination in wheel hubs.

• Inside diameter: 1.350 inches (34.290 mm)
• Outside diameter: 2.575 inches (65.410 mm)
• Housing bore: 2.571 inches (65.300 mm)
• Width: 0.706 inches (17.930 mm)
• Material: durable nitrile rubber for resistance to oil and wear
• Type: 62 series oil seal
• Part number: 8594S

Detailed Product Description and Specifications

The National 8594S wheel seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and greases, making it suitable for axle and driveline sealing applications. With an inside diameter of 1.350 inches and an outside diameter of 2.575 inches, this seal fits shafts and housings precisely to prevent oil leaks and ingress of dirt or moisture. The 0.706-inch width ensures a secure fit within the housing bore of 2.571 inches, matching the dimensions required for proper sealing performance.

This oil seal belongs to the 8000 series from National, a line recognized for consistent quality in sealing solutions for automotive driveline components. The 62 type designation indicates the specific profile and lip design optimized for wheel hub sealing.

Compatible Vehicles and Applications

This wheel seal is compatible with a range of classic General Motors vehicles, including Buick Cutlass and LeSabre, Oldsmobile Cutlass Supreme and 442, and Pontiac Firebird, Grand Prix, GTO, LeMans, Skylark, and Tempest models. The National 8594S is designed to meet the sealing requirements of these vehicles’ driveline and axle assemblies, ensuring proper lubrication retention and contamination prevention.

Common Issues Addressed by the National 8594S Wheel Seal

• Prevents oil leaks from wheel hubs and axle assemblies
• Protects bearings and internal components from dirt and moisture
• Reduces risk of premature wear due to contamination
• Maintains proper lubrication for driveline efficiency
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

• Ensure the shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal lip is oriented correctly to face the lubricant side
• Check shaft surface for wear or damage that could compromise seal performance
• Apply a light coating of compatible lubricant on the seal lip before installation

Quality Assurance and Warranty

National manufactures the 8594S wheel seal to meet industry standards for durability and performance. The nitrile material and precise dimensions ensure reliable sealing under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, providing confidence in the product’s quality and longevity.