National 100552 Differential Pinion Seal - Rear or Rear Outer

National Differential Pinion Seal 100552 Overview

The National Differential Pinion Seal 100552 is engineered to provide reliable sealing performance for driveline applications. Designed specifically for select Ford, Lincoln, Mazda, and Mercury models, this oil seal helps maintain optimal differential function by preventing fluid leaks and contamination.

• Inside diameter: 1.844 inches (46.840 mm)
• Outside diameter: 2.872 inches (72.950 mm)
• Thickness: 0.425 inches (10.800 mm)
• Flanged outside diameter: 3.228 inches (82.000 mm)
• Bi-directional lip design for enhanced sealing
• Constructed from durable fluoro-elastomer material
• Compatible housing bore diameter: 2.865 inches (72.770 mm)

Technical Details and Material Specifications

This differential pinion seal features a bi-directional lip design that ensures effective sealing against oil leaks in both rotational directions. The fluoro-elastomer construction offers resistance to heat, oil, and wear, making it suitable for demanding automotive environments. With an overall width of 0.472 inches (12.000 mm) including the side lip, the seal fits precisely within the housing bore diameter of 2.865 inches (72.770 mm), ensuring a secure and leak-free installation.

Compatible Vehicles and Applications

The National 100552 differential pinion seal is compatible with a range of Ford, Lincoln, Mazda, and Mercury vehicles. It is designed for models including the Ford Edge, Escape, Explorer, Flex, Fusion, Taurus, and Taurus X; Lincoln MKS, MKT, MKX, MKZ, and Milan; Mazda Tribute; and Mercury Mariner and Sable. This part number is ideal for those seeking a reliable replacement seal for differential pinion shafts in these specific vehicles.

Common Issues Addressed by the Differential Pinion Seal

• Prevents differential oil leaks that can cause driveline damage
• Protects internal components from dirt and contaminants
• Maintains proper lubrication within the differential assembly
• Reduces risk of premature wear on pinion bearings and gears
• Helps avoid costly repairs related to fluid loss and contamination

Installation Notes and Tips

Ensure the housing bore and shaft surfaces 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’s orientation matches the bi-directional lip design for optimal performance. Lubricate the seal lip lightly with differential oil prior to installation to reduce initial wear. Follow vehicle-specific service manual instructions for torque specifications and assembly procedures.

Quality Assurance and Warranty Information

National manufactures the 100552 differential pinion seal to meet industry standards for durability and performance. The fluoro-elastomer material and precise dimensional tolerances contribute to long service life under normal operating conditions. While specific warranty details may vary, National typically offers coverage against manufacturing defects. Consult product documentation or authorized sources for warranty terms related to this part.