1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 193Get this manual
6Apply OM: Adhesive to the groove on the underside of the grommet Install grommet onto the impeller housing7Lightly oil pinion splines of the driveshaftSlide the driveshaft through the impeller housing and impeller until drive pin flat of the driveshaft is below the impeller8Align drive cam flat with groove ofthe impellerInstall the impeller drive camSharp edge of the cam is leading edge during driveshaft rotation Slide the impeller housing down the driveshaftEngage the impeller with the cam
INotel Verifythatthe impeller engages the impeller cam properlySerious powerhead damage will result if impeller cam is displaced