Sierra Oil Seal 18-2075, Replaces OMC 332942, for Evinrude Outboard Prop Shaft/Driveshaft

The Sierra 18-2075 is an oil seal engineered for Evinrude outboard prop and driveshaft applications. It rides on a 1.562 inch shaft and fits a 2.062 inch outer diameter bore, with a compact 0.300 inch width that fits the original seal cavity without modification. The seal carries a machined exterior finish for a precise, consistent fit against the housing bore, helping it hold its seal against water intrusion and lubricant loss at the prop shaft and driveshaft interface.

This seal is a direct cross-reference for OMC 332942, making it a straightforward replacement when the original equipment seal has hardened, cracked, or begun to leak. Keeping the prop shaft or driveshaft seal in good condition protects the gear case from water intrusion, which is one of the most common causes of gear lube contamination and internal corrosion in outboard lower units. Because a worn seal is a small, low-cost part responsible for protecting an expensive gear case, replacing it proactively during a lower unit service is a common maintenance practice.

The Sierra 18-2075 is sold individually and is sized for use where the 1.562 inch shaft and 2.062 inch bore dimensions match the original seal being replaced.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2075
• Product Type: Oil Seal
• Application: Evinrude Outboard Prop and Driveshaft Seal
• Outer Diameter: 2.062 inches
• Shaft Size: 1.562 inches
• Width: 0.300 inches
• Exterior Finish: Machined
• Weight: 0.28 pounds
• UPC: 030999562432
• OEM Cross Reference: OMC 332942

Replaces (OEM)

• OMC 332942

Frequently Asked Questions

What does the Sierra 18-2075 oil seal fit? The Sierra 18-2075 is an oil seal designed for Evinrude outboard prop and driveshaft applications, sized to a 1.562 inch shaft and a 2.062 inch outer diameter bore.

Is the Sierra 18-2075 a genuine OEM part or an aftermarket replacement? The 18-2075 is a Sierra-manufactured replacement seal, sold as a direct cross-reference for OMC 332942 rather than an original Evinrude/OMC-branded part.

What OEM part number does the Sierra 18-2075 replace? The Sierra 18-2075 replaces OMC 332942, so it can be ordered using either part number when servicing the prop shaft or driveshaft seal.

What is the shaft size and outer diameter of this seal? The 18-2075 has a shaft size of 1.562 inches and an outer diameter of 2.062 inches, with a width of 0.300 inches.

How much does the Sierra 18-2075 oil seal weigh? The Sierra 18-2075 oil seal weighs 0.28 pounds.

What finish does the Sierra 18-2075 seal have? This seal has a machined exterior finish, giving it a precise fit against the housing bore for a consistent seal.

Why would I need to replace the prop shaft or driveshaft seal on my outboard? A worn or hardened seal like the 18-2075 can allow water to enter the gear case, which leads to gear lube contamination and internal corrosion, so replacing it at the first sign of leakage protects the lower unit.

How many seals come in the package? The Sierra 18-2075 is sold as a single individual oil seal.

Does the Sierra 18-2075 come with installation instructions or tools? The Sierra 18-2075 is supplied as the seal component only, without installation tools or instructions in the package.

Can the Sierra 18-2075 be used on other outboard brands besides Evinrude? The Sierra 18-2075 is cataloged for Evinrude outboard prop and driveshaft seal applications and cross-references to OMC 332942; confirm your shaft size and bore diameter match 1.562 inches and 2.062 inches before ordering for another application.