Yamaha Oil Seal S-Type Lower Casing - 93101-28M16-00

The small ring that keeps your gear-case healthy is the Yamaha S-Type Lower-Casing Oil Seal (93101-28M16-00)—precision-cut to 28 mm ID × 43 mm OD × 7 mm wide for the driveshaft pocket on dozens of Yamaha V-6 and inline-four outboards. Pop this fresh seal into the carrier and you lock water out, lock gear lube in, and spare yourself the cost of a full lower-unit rebuild.

Molded from fuel- and oil-resistant NBR rubber, the seal stays supple even after seasons of hot running and salt-spray storage. A stainless-steel garter spring hugs the shaft, while the S-type dual-lip profile clears micro-debris without letting seawater sneak past.

Why it deserves space in your toolkit

• Exact OEM fit—drop-in replacement for Yamaha part 93101-28M16-00; no trimming or shimming required.

• Double-lip design for twice the barrier against emulsified lube and corrosion.

• Marine-grade materials—UV-stabilized rubber and stainless spring laugh at salt and heat.

• Quick DIY swap—remove the carrier, tap the old seal out, press the new one in, add fresh gear oil, and you’re back on the plane.

Install it before a tell-tale milky drip turns into ground gears, and keep your Yamaha running smooth, quiet, and dry season after season.