1978 Johnson 4HP outboards Service Repair Manual P/N JM-7803, Page 71Get this manual

1978 Johnson 4HP outboards Service Repair Manual P/N JM-7803, Page 71

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