Re: 1962 Johnson 3hp Seahorse

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April 8, 2018 at 2:00 pm #73611
cajuncook1
Participant

    Pam, if both cylinders are 15psi each, then the likely culprits is the head gasket. Those head gaskets do not have fire ring protecters. Chances are there is a tear or leak from the head gasket in between both cylinders. The hallmark is low even pressure from both cylinders. Please do not tear the motor down and re-ring until you have seen the head gasket condition. Regardless you will have replace the head gasket.