O-RING 93210-85M97 REC93210-85M97

Function and technical context

The 93210-85M97 O-ring is an elastomeric seal that seals critical components in Yamaha engine cooling and lubrication systems. This piece acts as a hermetic barrier between surfaces that are subject to pressure and relative movement, preventing leaks of coolant, seawater or lubricating oil to areas where there should be no fluid circulation. Its deterioration or hardening causes progressive leaks that can compromise engine cooling, generate water entry into the crankcase or loss of lubrication at critical points, with the consequent risk of overheating, internal corrosion or seizure of moving components.

When to replace this part?

The O-rings suffer progressive elastomeric degradation due to exposure to temperatures, pressure cycles and chemically active fluids, manifested by visible water or oil losses around the sealed area, moisture stains at the base of the engine or abnormal drop in coolant levels between revisions. It is recommended to inspect its condition during each seasonal maintenance and replace it preventively when components related to cooling or lubrication systems are dismantled, thus avoiding costly emergency repairs and unexpected stops in navigation. Its replacement is especially critical before intensive navigation seasons or after long periods of storage.

Equivalent manufacturer part numbers