1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 196Get this manual
Water Pump Servicing 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 kit, proceed as follows:
Removal
rv theRemove the four screws retaining the impeller housing to 1L!J gearcasef21 2Slide the water pump assembly off the driveshaftRemove