Sierra Oil Strainer Seal 18-0486 for Yamaha Outboard Gearcase & Drive

The Sierra Oil Strainer Seal, part number 18-0486, is a replacement seal designed for Yamaha outboard gearcase and drive applications. It seals the oil strainer to prevent lubricant leaks and contamination from entering the gearcase, helping protect internal gear and bearing surfaces from water intrusion and debris. Keeping this seal in good condition is important whenever the oil strainer or gearcase is serviced, since a worn or damaged seal can allow gear lube to leak out or allow water to seep in, leading to premature wear of gearcase components. This is a small, low-cost part that is easy to overlook during a gearcase service, but it plays a direct role in keeping the lubrication system sealed and functioning correctly. It ships as a compact, lightweight seal sized to fit directly in place of the original equipment part, making it a straightforward swap during routine maintenance or a gearcase rebuild. Sierra is a widely recognized name in marine replacement parts, and this seal is manufactured to work as a direct fit for the Yamaha outboard gearcase and drive systems it is designed for.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0486
• Product Name: Oil Strainer Seal
• Category: Yamaha Outboard Gearcase & Drive Parts
• Package Dimensions: 4 x 4 x 0.5 inches
• Weight: 0.02 pounds
• UPC: 808282385798

Fitment

• Yamaha outboard gearcase and drive applications

Frequently Asked Questions

What is the Sierra 18-0486 oil strainer seal used for? It seals the oil strainer in Yamaha outboard gearcase and drive applications, preventing gear lube leaks and keeping water and debris out of the gearcase.

Does this seal fit Yamaha outboards specifically? Yes, Sierra part 18-0486 is designed for Yamaha outboard gearcase and drive applications.

What are the package dimensions of the 18-0486 oil strainer seal? The Sierra 18-0486 oil strainer seal has package dimensions of 4 x 4 x 0.5 inches.

How much does the oil strainer seal weigh? The Sierra 18-0486 oil strainer seal weighs 0.02 pounds.

Is Sierra 18-0486 a genuine Sierra part or aftermarket? It is a Sierra-branded replacement part, sold under Sierra's own part number 18-0486 rather than an OEM Yamaha number.

When should I replace the oil strainer seal on my Yamaha outboard? Replace Sierra part 18-0486 any time the oil strainer is removed for gearcase service, or if it shows signs of wear, cracking, or leaking gear lube.

What happens if a worn oil strainer seal is not replaced? A worn 18-0486 seal can allow gear lubricant to leak out or let water intrude into the gearcase, which can lead to premature wear of internal gearcase components.

What is included when I order this part? Ordering Sierra 18-0486 gets you the single oil strainer seal component for the gearcase oil strainer.

Is the 18-0486 seal easy to install myself? Yes, it is a simple seal that fits in place of the original oil strainer seal during routine gearcase maintenance or a rebuild.

What material is the Sierra 18-0486 seal made from? Material details for the Sierra 18-0486 oil strainer seal are not specified by the manufacturer.