National 370247A Wheel Seal - Rear Inner

Overview of National 370247A Wheel Seal

The National 370247A wheel seal is engineered for reliable sealing performance in driveline applications. Designed specifically for select Ford models, this oil bath seal helps maintain optimal lubrication and prevent contamination in wheel hubs.

• Compatible with Ford Excursion, F-250 Super Duty, F-350 Super Duty, Transit-150, Transit-250, Transit-350, and Transit-350 HD
• Constructed from durable nitrile material for resistance to oil and wear
• Dimensions: 3.882 inch (98.6 mm) outside diameter, 3.875 inch (98.43 mm) housing bore, 2.955 inch (75.06 mm) shaft diameter, and 0.488 inch (12.4 mm) width
• Designed as an oil bath seal to maintain lubrication and prevent leaks
• Installation tool recommended: Rd247 for proper fitment

Detailed Product Description

The National 370247A wheel seal is part of the 370000 series and is manufactured using nitrile, a material known for its excellent resistance to oil, heat, and abrasion. This seal features an outside diameter of 3.882 inches (98.6 mm) and fits a housing bore of 3.875 inches (98.43 mm), ensuring a precise fit for the specified Ford driveline components. The shaft diameter is 2.955 inches (75.06 mm), and the seal width is 0.488 inches (12.4 mm), dimensions critical for maintaining a secure seal around the axle shaft. The oil bath design helps retain lubricant within the hub assembly while preventing dirt, water, and other contaminants from entering, which is essential for the longevity of wheel bearings and related components.

Applications and Problem Solving

• Prevents oil leaks in wheel hubs of Ford Excursion and Super Duty trucks
• Protects driveline components from dirt and moisture intrusion
• Reduces wear on wheel bearings by maintaining proper lubrication
• Helps avoid costly repairs related to seal failure and contamination
• Ensures consistent performance in heavy-duty and commercial vehicle applications

Installation Notes and Tips

For optimal installation of the National 370247A wheel seal, use the recommended Rd247 installation tool to avoid damage to the seal lip and ensure even seating. Clean the housing bore thoroughly before installation to remove debris and old sealant. Lubricate the seal lip lightly with clean oil to facilitate smooth installation and prevent dry running at startup. Verify shaft and bore dimensions to confirm compatibility with your specific Ford model.

Quality Assurance and Warranty

National wheel seals are manufactured to meet or exceed OEM specifications, ensuring reliable performance in demanding conditions. The 370247A seal undergoes rigorous quality control to maintain dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects, providing confidence in the durability and function of this wheel seal.