O-RING 93210-42101 REC93210-42101

Function and technical context

The O-ring is a circular seal that seals critical components of the cooling and lubrication system of Yamaha and Mercury marine engines. This piece acts as a waterproof barrier between metal surfaces in motion or under pressure, preventing leaks of cooling fluids and oil. Its correct operation is essential to maintain the integrity of the closed circuit of the engine; Any degradation of the elastomer compromises the tightness and can cause coolant losses, overheating of the engine block and entry of water into critical areas.

When to replace this part?

O-rings progressively degrade due to exposure to elevated temperatures, compression cycles and contact with corrosive fluids typical of the marine environment. The most common symptoms include oil or coolant stains around the sealing area, salt residue buildup on gaskets, and gradual fluid loss during operation. Although there is no fixed interval, it is recommended to inspect the condition of the ring during each seasonal maintenance and replace it preventively every 2-3 years of intensive use in salt water. Changing the gasket preventively avoids unexpected stops at sea and more costly repairs resulting from leaks not detected in time.

Equivalent manufacturer part numbers