1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 223Get this manual
Lightly oil pinion of the d.riveshaftSI.ide through the impeller housing and Impeller until dnve pin flat of the driveshaft is below the impeller 19l 7
Align drive cam flat with groove of the impellerInstall the impeller drive cam Sharp edge CD of the cam is leading edge during drives haft rotation Q)Slide the impeller housing down the driveshaftEngage the impeller with the cam
fN=J Verify that the impeller engages the impeller cam properly