LOWER GASKET 676-45314-00 REC676-45314-00

Function and technical context

This lower gasket is part of the Yamaha engine sealing systems, sealing the critical joints in the lower area of the drive structure. Its function is to prevent leaks of coolant liquids, lubrication oil or seawater, depending on its specific position in the engine-transmission assembly. Deterioration or breakage of this gasket can cause gradual coolant losses, unwanted water entry into internal chambers or contamination of the lubrication circuit, compromising the thermal and mechanical integrity of the propeller. Correct sealing in the lower area is essential to maintain system pressure and avoid accelerated corrosion of internal engine components.

When to replace this part?

The lower engine gaskets show signs of aging when drips are observed under the engine area, gradual loss of coolant without apparent location in hoses, or changes in the color and viscosity of the oil. It is recommended to inspect and replace preventively every two seasons of intensive navigation or after major maintenance interventions in the crankshaft and block area. The planned replacement of this gasket avoids unexpected breakdowns during navigation and prevents secondary damage due to the entry of water or insufficient lubricant into the motor bearings.

Equivalent manufacturer part numbers