1980 Johnson 4HP Service Repair Manual P/N JM-8004, Page 68Get this manual

1980 Johnson 4HP Service Repair Manual P/N JM-8004, Page 68

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Observe location of keyway in impeller and key in driveshaftSlide water pump assembIy down driveshaft and engage key Impeller housing cover will contact spacer in water pump cavity before cover flange