Reply To: 1956 Evinrude Big Twin #25022 water pump

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January 4, 2020 at 12:44 pm #190668
olcah
Participant

    US Member

    Worth a look to assure that the crankshaft to driveshaft splines are not worn out.
    Maybe the little pin that keys the impeller to the driveshaft is missing or not engaging the impeller (short).
    Impeller vanes not flexed in the proper direction when stationary.
    Pump bottom plate worn excessively.