Yamaha - O-Ring Engine Sealing Component 93210-32738-00. Overview. Anyone who spends time servicing Yamaha outboards knows that small sealing parts like O-rings can make or break a repair. This Yamaha O-Ring is designed to create a tight seal between engine components, helping prevent leaks and keeping systems operating at the right pressure. Heat, age, and exposure to oil or water can eventually flatten or harden an O-ring. Swapping it out during service is a simple step that helps keep the eng