Sierra Oil Seal 18-2061, Replaces OMC 329922, for Evinrude Outboard Prop and Driveshaft

The Sierra 18-2061 is an oil seal engineered for the prop and driveshaft area of Evinrude outboard motors. It seals against water intrusion and oil loss at the point where the driveshaft passes through the lower unit housing, protecting internal gears and bearings from corrosion and lubricant contamination. The seal features a machined exterior finish for a precise, consistent fit in the housing bore, and its compact dimensions (1.375 inch outer diameter, 0.822 inch shaft size, 0.195 inch width) match the tight tolerances required for a proper seal in this application. Because oil seals are a wear item exposed to constant water contact and shaft rotation, they are a common maintenance replacement whenever a lower unit is serviced, rebuilt, or opened up for gear or bearing work. The Sierra 18-2061 is built as a direct equivalent to the original OMC 329922 seal, allowing it to be installed in the same location without modification. It is sold as an individual replacement seal, sized specifically for Evinrude outboard prop and driveshaft seal applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2061
• Product Category: Evinrude Outboard Prop and Driveshaft Seal
• Outer Diameter: 1.375 inches
• Shaft Size: 0.822 inches
• Width: 0.195 inches
• Weight: 0.02 pounds
• Finish: Machined
• OEM Cross Reference: OMC 329922
• GLM Cross Reference Number: 86240
• UPC: 030999310125

Fitment

Designed for Evinrude outboard prop and driveshaft seal applications.

Replaces (OEM)

• OMC 329922

Frequently Asked Questions

What does the Sierra 18-2061 oil seal fit? The Sierra 18-2061 is designed for Evinrude outboard prop and driveshaft seal applications, sealing the point where the driveshaft passes through the lower unit housing.

Is the 18-2061 seal equivalent to an OMC part? Yes, the Sierra 18-2061 is a direct equivalent to OMC part number 329922 and installs in the same location without modification.

What are the dimensions of the 18-2061 oil seal? It has an outer diameter of 1.375 inches, a shaft size of 0.822 inches, and a width of 0.195 inches.

How much does the 18-2061 oil seal weigh? The Sierra 18-2061 weighs 0.02 pounds.

What finish does the Sierra 18-2061 have? This oil seal has a machined exterior finish, which helps it seat precisely in the housing bore.

When should this oil seal be replaced? Oil seals like the 18-2061 are a wear item and are commonly replaced whenever the lower unit is serviced, rebuilt, or opened for gear or bearing work, or if water intrusion or oil loss is noticed.

Is the 18-2061 sold as a single seal or a kit? The Sierra 18-2061 is sold as an individual replacement oil seal, not part of a multi-piece kit.

Does the 18-2061 have any other cross-reference numbers besides OMC 329922? Yes, the 18-2061 also carries GLM cross-reference number 86240 in addition to matching OMC 329922.

What is the UPC for the Sierra 18-2061 oil seal? The UPC for the Sierra 18-2061 oil seal is 030999310125.

Is the Sierra 18-2061 a genuine Sierra part or aftermarket? The 18-2061 is manufactured and sold under the Sierra brand as a replacement seal for Evinrude outboard applications, built as a direct equivalent to the OMC 329922 seal.