FAG SS5261 Differential Pinion Seal - Rear

Reliable Differential Pinion Seal for BMW 318i, 318is, 328i, and 328is

The FAG SS5261 differential pinion seal is engineered to provide effective sealing performance for BMW 318i, 318is, 328i, and 328is models. Designed with durable nitrile sealing material and a rubber spring auxiliary lip, this seal helps maintain drivetrain integrity by preventing fluid leaks.

• Seal Type: Rubber with spring and auxiliary lip for enhanced sealing
• Sealing Material: High-quality nitrile for resistance to oil and wear
• Bore Diameter: 2.559 inches (64.999 mm) ensuring precise fit
• Seal Outside Diameter: 2.57 inches (65.278 mm) for secure installation
• Seal Width: 1.772 inches (8.001 mm) providing optimal sealing surface

Technical Details and Construction

The FAG SS5261 differential pinion seal features a robust design combining a rubber seal with a spring and auxiliary lip to maintain consistent pressure against the pinion shaft. The nitrile sealing material offers excellent resistance to automotive fluids and temperature variations, making it suitable for the demanding conditions of BMW driveline systems. With precise bore and outside diameters, this seal ensures a tight fit to prevent leaks and contamination.

Applications and Problem Solving

This differential pinion seal is compatible with BMW 318i, 318is, 328i, and 328is models, providing a reliable replacement part for maintaining differential performance. It addresses common issues such as:

• Preventing differential oil leaks that can lead to drivetrain damage
• Reducing contamination ingress into the differential assembly
• Maintaining proper lubrication levels for pinion gears
• Minimizing wear on the pinion shaft and bearings
• Ensuring consistent seal pressure with the auxiliary lip design

Installation Notes and Tips

When installing the FAG SS5261 differential pinion seal, ensure the sealing surface and bore are clean and free of debris. Use appropriate tools to avoid damaging the seal during installation. Verify the seal orientation, with the auxiliary lip facing the fluid side, to maintain optimal sealing performance. Proper installation helps extend the service life of the seal and the differential components.

Quality Assurance and Warranty

FAG manufactures the SS5261 differential pinion seal to meet strict quality standards for durability and performance. The use of nitrile sealing material and a spring-loaded auxiliary lip reflects FAG's commitment to reliable sealing solutions. While specific warranty details are not provided, FAG products typically adhere to industry standards for automotive replacement parts.