Sierra 18-2056 Oil Seal for Mercury Marine Stern Drive Model 898/228, Replaces 26-66302 26-96503

The Sierra 18-2056 is a rubber oil seal engineered as a direct replacement component for Mercury Marine stern drive applications, specifically fitting Stern Drive Model 898/228 within the serial number range 4782330 to 6225576. This seal is designed to prevent oil leakage and keep contaminants out of the drive unit housing, protecting internal gears and bearings from water intrusion and lubricant loss. Built from black rubber material, the seal is sized with a 1 inch item diameter and is manufactured for compatibility with the original equipment specification it replaces.

This is a single-piece oil seal (quantity of 1 required per the applicable service reference) intended for technicians and boat owners performing stern drive maintenance or seal replacement service. It serves as a functional equivalent to Mercury Marine part numbers 26-66302 and 26-96503, allowing for straightforward replacement without altering fit or function. As a compact, precision-molded rubber component, it is intended to be installed following standard stern drive service procedures and torque/seating practices for oil seals in this housing location.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2056
• Material: Rubber
• Color: Black
• Item Diameter: 1 inch
• Weight: 0.02 pounds
• Package Dimensions: 11.176 centimeters length x 10.16 centimeters width x 0.762 centimeters height
• Country of Origin: Taiwan
• UPC: 030999310071
• Stern Drive Model Fitment: 898/228
• Serial Number Range: 4782330 to 6225576
• Quantity Required: 1

Fitment

• Mercury Marine Stern Drive Model 898/228, serial numbers 4782330 to 6225576

Replaces (OEM)

• Mercury Marine 26-66302
• Mercury Marine 26-96503

Frequently Asked Questions

What stern drive does the Sierra 18-2056 oil seal fit? The Sierra 18-2056 fits Mercury Marine Stern Drive Model 898/228 within the serial number range 4782330 to 6225576.

What OEM part numbers does the 18-2056 replace? This oil seal replaces Mercury Marine 26-66302 and 26-96503, so either OEM number can be cross-referenced to this Sierra 18-2056 seal.

How many of these seals are needed per stern drive? One Sierra 18-2056 oil seal is required per the applicable Stern Drive Model 898/228 service application.

What material is the 18-2056 oil seal made from? It is made from black rubber, which provides the flexibility and sealing properties needed for stern drive oil seal applications.

What size is the Sierra 18-2056 oil seal? The Sierra 18-2056 has an item diameter of 1 inch and measures 11.176 centimeters in length, 10.16 centimeters in width, and 0.762 centimeters in height as packaged.

How much does the 18-2056 oil seal weigh? The Sierra 18-2056 oil seal weighs 0.02 pounds.

Is the Sierra 18-2056 a genuine Mercury Marine part or an aftermarket seal? The 18-2056 is a Sierra-brand seal manufactured as a replacement for Mercury Marine 26-66302 and 26-96503, not an OEM Mercury Marine part.

Where is this oil seal used within the stern drive? The 18-2056 is used within the Mercury Marine Stern Drive Model 898/228 housing to prevent oil leakage and keep out water and debris.

What is included when I order the Sierra 18-2056? The order includes one Sierra 18-2056 rubber oil seal, packaged individually.

Where is the Sierra 18-2056 manufactured? The Sierra 18-2056 oil seal is manufactured in Taiwan.

Can the 18-2056 be used on a stern drive outside the listed serial number range? The Sierra 18-2056 is specified for Stern Drive Model 898/228 with serial numbers 4782330 to 6225576; use outside that range is not confirmed by the fitment data.