Sierra Oil Seal 18-0526 - OEM 26-48443 for Mercruiser Stern Drive, 0.750 Inch Shaft

The Sierra 18-0526 is an oil seal engineered for Mercruiser stern drive applications, replacing OEM number 26-48443. It is built to contain gear lubricant and keep water and contaminants out of the drive housing, protecting internal gears and bearings from premature wear. The seal measures 0.750 inches at the shaft, 1.379 inches on the outer diameter, and 0.256 inches in width, and is finished in black. Sierra constructs this seal using quality materials selected for exceptional life and performance in the marine environment, where seals are constantly exposed to water, salt, and lubricant. Each unit ships as a single oil seal, ready to install as a direct replacement during drive service or seal maintenance. Because stern drive seals are a wear item that hardens and loses sealing ability over time, replacing the 18-0526 at the proper interval helps prevent lubricant leaks and water intrusion that can lead to more costly drive repairs.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0526
• Shaft Size: 0.750 inches
• Outer Diameter: 1.379 inches
• Width: 0.256 inches
• Color: Black
• Weight: 0.02 pounds
• Quantity: 1 oil seal
• UPC: 030999874375

Fitment

• Mercruiser stern drive

Replaces (OEM)

• 26-48443

Frequently Asked Questions

What does the Sierra 18-0526 oil seal replace? It is a direct replacement for OEM number 26-48443 used on Mercruiser stern drive units.

What shaft size is the 18-0526 seal designed for? This seal has a 0.750 inch shaft size, with a 1.379 inch outer diameter and a 0.256 inch width.

What color is the Sierra 18-0526 oil seal? It is finished in black.

How much does the 18-0526 oil seal weigh? The seal weighs 0.02 pounds.

How many seals come in one order? One order includes a single 18-0526 oil seal.

What is the 18-0526 oil seal used for? It seals the Mercruiser stern drive housing, keeping gear lubricant in and water and debris out.

Is the Sierra 18-0526 an OEM or aftermarket part? It is an aftermarket Sierra part manufactured as a replacement for OEM number 26-48443, not an OEM Mercruiser part.

When should a stern drive oil seal like the 18-0526 be replaced? A seal in this position should be replaced when it hardens, leaks lubricant, or allows water intrusion into the drive housing, or as part of routine drive service.

What UPC is associated with the Sierra 18-0526 oil seal? The UPC for this oil seal is 030999874375.

Does the 18-0526 seal come with installation hardware? No, the package includes only the oil seal itself; no additional hardware is included.