1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 207Get this manual
Water Pump ServicingAll Models If the gearcase has been in service for any length of time, It IS good policy to install water pump repair kitTo install the repair kitproceed as follows:
Removal r:jl1 Remove the four screws retaining the impeller housingto the gearcase2Slide the water pump assembly off the driveshaftRemove the impeller drive cam and impeller plate