Reply To: 1958 Johnson 10 hp

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April 30, 2020 at 2:29 pm #201580
Mumbles
Participant

    If you rocked the motor back and forth 180 degrees, you should pull the gearcase and check the water pumps impeller as the vanes may have gotten folded backwards or broken off if the impeller was old and brittle. Replacing the impeller is part of a preventive maintenance program anyway.