1979 Johnson Outboards 4 HP Models Service Repair Manual P/N JM-7903, Page 68Get this manual

1979 Johnson Outboards 4 HP Models Service Repair Manual P/N JM-7903, Page 68

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location of keyway in impeller and key in driveshaftSlide water pump assembIy down driveshaft and engage keyImpeller housing will contact spacer in water pump cavity before flange contacts face of gea