Sierra Oil Seal 18-2029, Replaces 321480, Evinrude Outboard Prop & Driveshaft Seal

The Sierra 18-2029 is an oil seal built for Evinrude outboard prop and driveshaft seal applications. Its role is to keep water out and lubricant in around the driveshaft and propeller shaft area of the lower unit, protecting internal gearcase components from water intrusion and preventing lubricant loss that can lead to premature wear or corrosion. The seal has a machined exterior finish for a precise, consistent fit against the shaft and housing bore it seals against. It is manufactured in Taiwan and is compact, with product dimensions of 0.39 x 0.39 x 0.39 inches and a shipped weight of 0.02 pounds, so it ships and installs easily as a small, targeted repair part rather than a full assembly replacement. Because it is designed as a direct-fit replacement for the original equipment seal, it restores the sealing function of the lower unit without requiring modification to surrounding components. This seal is commonly kept on hand for scheduled lower unit service, gearcase rebuilds, or as part of a repair when water intrusion or lubricant leakage is diagnosed at the driveshaft or prop shaft seal location.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2029
• Category: Evinrude Outboard Prop & Driveshaft Seal
• UPC: 030999309754
• Weight: 0.02 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• Package Dimensions: 5.13 inches L x 4.0 inches W x 1.25 inches H
• Exterior Finish: Machined
• Country of Origin: Taiwan
• OEM Cross Reference: 321480

Fitment

The Sierra 18-2029 is used in Evinrude outboard prop and driveshaft seal applications.

Replaces (OEM)

321480

Frequently Asked Questions

What does the Sierra 18-2029 oil seal fit? The Sierra 18-2029 is used in Evinrude outboard prop and driveshaft seal applications, sealing the driveshaft or propeller shaft area of the lower unit.

What OEM part number does the 18-2029 replace? It replaces OEM part number 321480, making it a direct cross-reference for that Evinrude seal.

What are the dimensions of this oil seal? The Sierra 18-2029 oil seal measures 0.39 x 0.39 x 0.39 inches as shipped in its individual product form.

How much does the 18-2029 oil seal weigh? This oil seal weighs 0.02 pounds.

Where is the Sierra 18-2029 manufactured? The Sierra 18-2029 oil seal is manufactured in Taiwan.

Is the 18-2029 a genuine Evinrude part or an aftermarket replacement? The Sierra 18-2029 is an aftermarket seal manufactured by Sierra as a cross-reference replacement for OEM number 321480, not an original Evinrude-branded part.

What finish does the 18-2029 seal have? It has a machined exterior finish for a precise fit at the sealing surface.

What is included when I order part 18-2029? Ordering Sierra 18-2029 gets you one oil seal for Evinrude outboard prop and driveshaft seal applications; it does not include gaskets or other lower unit hardware unless listed separately.

Will the 18-2029 stop water intrusion in the lower unit? Yes, as an oil seal for the driveshaft and prop shaft area, the 18-2029 is designed to keep water out of the gearcase and retain lubricant inside it.

What is the UPC for the Sierra 18-2029 oil seal? The UPC for the Sierra 18-2029 is 030999309754.

Is 18-2029 a small or full-size replacement part? At 0.39 x 0.39 x 0.39 inches and 0.02 pounds, the 18-2029 is a small, single-component oil seal rather than a full lower unit assembly.