OIL SEAL 9.8X24X9 YAMAHA 93103-09800

Function and technical context

The oil seal is an essential component in the lubrication system of Yamaha engines, responsible for preventing lubricant from escaping from the crankshaft to the outside. With dimensions of 9.8x24 mm, this dynamic seal works under conditions of pressure and continuous rotation inside the motor. Its deterioration allows engine oil to leak, which reduces the protective film between moving components, causing excessive friction, localized overheating and finally seizure or failure of the crankshaft. A defective seal also allows water and dirt to enter from the outside into the inside of the engine, compromising the integrity of the lubricant and accelerating the degradation of all lubricated surfaces.

When to replace this part?

Oil seals begin to lose elastomer after 500-800 hours of operation or after several years of inactivity, especially in engines exposed to temperature changes or saline environments. Characteristic symptoms include oil stains or drips around the crankshaft area, gradual loss of lubricant level without identifying visible leaks in other areas, and the smell of burning oil coming from the engine. It is recommended to replace this seal preventively during seasonal maintenance every 2-3 years, or immediately upon detecting any oil leak, since its preventive replacement avoids costly subsequent repairs due to crankshaft damage or severe engine contamination.

Equivalent manufacturer part numbers