Gasket 313065 802243

Function and Technical Context

This gasket acts as a sealing element between two joining surfaces within the outboard motor, preventing the passage of fluids—whether cooling water, oil, or combustion gases—between cavities that must remain isolated. Its proper seating is fundamental to maintaining the integrity of the propulsion unit's internal circuits and ensuring that each fluid circulates exclusively through its intended circuit. Deterioration or excessive compression of this gasket can cause fluid mixing, pressure loss in the affected system, or water entry into critical engine zones, resulting in severe damage and costly repairs. It is a consumable wear part that must be replaced each time the joint housing it is dismantled, as reusing it would compromise the seal integrity of the assembly. Compatible with Mercury/Mariner/MerCruiser references 802243 and OMC 0313065 / 313065, it is approved for use in Johnson and Evinrude engines.

When to Replace This Part?

The most common signs that a gasket has failed are the appearance of oil stains or moisture traces at the cylinder head or valve cover joints, oil pressure loss detected on the gauge, or the presence of bubbles in the cooling circuit indicating gas leakage. As a preventive measure, it is recommended to replace this gasket whenever the assembly to which it belongs is serviced—at each seasonal overhaul or after disassembly for any reason—since retightening over an already compressed gasket does not guarantee the seal. Replacing it systematically is the safest and most economical professional practice to prevent serious breakdowns during navigation.

Compatible Johnson/Evinrude Engines

Equivalent Manufacturer References