SKF 23440 Wheel Seal - Rear Outer

Overview

SKF wheel seal 23440 is a rear outer sealing component for classic BMW driveline applications. It is built to keep lubricant contained and help block contaminants at the wheel end, with dimensions and sealing material specified for the application.

Key Features

• Nitrile sealing surface for dependable sealing performance.
• Precision dimensions: 0.315 width, 3.156 outside diameter, and 2.362 shaft diameter.
• Fits rear outer wheel seal applications on select BMW models.
• SKF part number 23440 for direct catalog identification.
• This part cross-references Four Seasons 66650 for the same application.

Detailed Description

SKF 23440 is a wheel seal engineered for rear outer positions on select BMW vehicles, including 1969-1982 BMW 2800, 3.0S, 3.0Si, 3.0CSi, 3.0CSL, Bavaria, 528i, 530i, 630CSi, and 633CSi applications. The seal uses a nitrile sealing surface and application-specific dimensions to match the shaft and housing requirements of the original setup. SKF has a long history in seal design, and this part reflects that focus on controlled sealing performance for driveline and axle service. If you are servicing a BMW 633CSi, BMW 528i, or BMW 3.0CSL rear outer wheel seal location, SKF 23440 provides a cataloged replacement option identified by part number 23440.

Common Uses

• Replacing a worn wheel seal that allows gear oil or grease to escape.
• Addressing contamination from road debris, water, or dust at the wheel end.
• Restoring sealing performance after age-related hardening or wear.
• Supporting service on classic BMW rear axle assemblies.

Installation Notes

Verify shaft diameter, outside diameter, and width before installation to confirm match with the housing and axle components. Clean the sealing surfaces thoroughly and inspect the mating area for wear, scoring, or corrosion before fitting the new seal. Proper installation technique is important to avoid damaging the nitrile sealing lip during assembly.

Quality Assurance

SKF designs and manufactures seals to specific application requirements using premium materials and established bonding techniques. The brand has supplied sealing products for more than a century, and this wheel seal is produced to support long service life and safe operation in the intended application.