Sierra Oil Seal 18-2023 for Evinrude/OMC Outboards, Replaces 313282

The Sierra 18-2023 Oil Seal is a replacement oil seal built for Evinrude and OMC outboard prop and driveshaft applications. It is a small, precision-machined seal designed to keep gearcase lubricant contained while blocking water intrusion at the driveshaft, protecting internal gears and bearings from corrosion and premature wear. With an outer diameter of 1.062 inches, a shaft size of 0.554 inches, and a width of 0.312 inches, the 18-2023 is sized to drop into the same location as the original equipment seal it replaces, cross-referencing directly to OEM number 313282. Its machined exterior finish supports a consistent, leak-resistant fit against the housing bore. This seal is typically used during gearcase service, driveshaft seal replacement, or lower unit rebuilds where the original seal has hardened, cracked, or begun to weep lubricant. Because it is sold as an individual component, it also appears as a listed content item within Sierra water pump kit assemblies that call for this seal as part of a complete rebuild. At just 0.02 pounds, it ships compact and is easy to add alongside other gearcase maintenance parts. Buyers replacing a leaking oil seal on an Evinrude or OMC outboard driveshaft can use the 18-2023 as a direct fit for the original 313282 seal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2023
• Outer Diameter: 1.062 inches
• Shaft Size: 0.554 inches
• Width: 0.312 inches
• Weight: 0.02 pounds
• Exterior Finish: Machined
• UPC: 030999309693
• OEM Cross Reference: 313282

Fitment

Designed for Evinrude and OMC outboard prop and driveshaft seal applications; also used as a component within Sierra water pump kit assemblies for these outboards.

Replaces (OEM)

• 313282

Frequently Asked Questions

What does the Sierra 18-2023 oil seal fit? The 18-2023 is designed for Evinrude and OMC outboard prop and driveshaft seal applications, and it also appears as a component seal within Sierra water pump kit assemblies for these outboards.

Does the 18-2023 cross-reference to an OEM part number? Yes, the Sierra 18-2023 oil seal cross-references directly to OEM number 313282.

What are the dimensions of this oil seal? The 18-2023 measures 1.062 inches outer diameter, 0.554 inches shaft size, and 0.312 inches in width.

How much does the 18-2023 oil seal weigh? This Sierra oil seal weighs 0.02 pounds.

What is the exterior finish on the 18-2023 seal? The Sierra 18-2023 oil seal has a machined exterior finish for a consistent fit in the housing bore.

Is the Sierra 18-2023 a genuine aftermarket replacement or OEM part? The 18-2023 is a Sierra aftermarket replacement seal manufactured to replace OEM number 313282, not an original OMC-branded part.

When would I need to replace this oil seal? This seal should be replaced when it hardens, cracks, or begins leaking gearcase lubricant, typically during a driveshaft seal replacement or lower unit rebuild on an Evinrude or OMC outboard.

Is the 18-2023 sold as a standalone seal or only as part of a kit? The 18-2023 oil seal is sold as an individual replacement part, and it is also listed as a content item within Sierra water pump kit assemblies for outboards that call for this seal.

What is included when I order the 18-2023? Ordering the Sierra 18-2023 gets you one oil seal sized 1.062 inches OD by 0.554 inches shaft by 0.312 inches width.

Does this seal require any special tools to install? The listing for the Sierra 18-2023 oil seal does not specify special tools; standard gearcase seal installation practices apply when fitting this driveshaft seal.