National HM803149 Differential Pinion Bearing - Rear Inner

National HM803149 Differential Pinion Bearing Overview

The National HM803149 differential pinion bearing is engineered to provide reliable support and smooth operation for the differential pinion shaft. Designed with precise dimensions, this taper bearing cone ensures optimal fitment and durability for various vehicle makes including Audi, BMW, Ford, and Mercedes-Benz.

• Taper bearing cone with a cone bore diameter of 1.7500 inches (44.45 mm)
• Cone length measures 1.1563 inches (29.37 mm) for accurate seating
• Cone radius of 0.1400 inches (3.556 mm) to maintain proper bearing geometry
• Compatible with a wide range of models such as BMW 540i, Ford F-250, and Mercedes-Benz 500SEL
• Part number HM803149 ensures correct identification and fitment

Technical Specifications and Design Details

This National differential pinion bearing features a taper bearing cone designed to support the pinion gear within the differential assembly. The cone bore diameter of 1.7500 inches (44.45 mm) and cone length of 1.1563 inches (29.37 mm) provide a precise fit to maintain alignment and reduce wear. The cone radius of 0.1400 inches (3.556 mm) helps distribute load evenly, contributing to the bearing’s longevity and performance under varying driving conditions.

Compatible Vehicles and Applications

The HM803149 bearing is compatible with numerous vehicle makes and models, including but not limited to Audi, BMW, Chevrolet, Chrysler, Dodge, Ford, GMC, Jeep, Lamborghini, Mercedes-Benz, and Pontiac. Specific models include BMW 540i, 740iL, M3, and Mercedes-Benz 500SEL, 600SL, as well as Ford F-250 and F-350 trucks. This part is ideal for those seeking a reliable replacement differential pinion bearing for these vehicles.

Common Issues Addressed by the HM803149 Bearing

• Eliminates excessive differential noise caused by worn pinion bearings
• Prevents premature wear and damage to the differential pinion gear
• Reduces vibration and improves drivetrain smoothness
• Restores proper differential gear alignment and function
• Helps maintain optimal bearing preload and torque settings

Installation Notes and Tips

When installing the National HM803149 differential pinion bearing, ensure the bearing cone is properly seated within the differential housing. Use appropriate tools to avoid damage to the bearing surfaces. Verify the cone bore and length dimensions match the vehicle specifications to maintain correct bearing preload. It is recommended to inspect related components such as the pinion gear and seals during installation for comprehensive drivetrain maintenance.

Quality Assurance and Warranty

National bearings are manufactured to meet industry standards for durability and performance. The HM803149 differential pinion bearing undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically adhere to OEM quality requirements, offering dependable service life when installed correctly.