1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 222Get this manual
Water Pump Servicing9.915 Disassembly
1Remove gearcase from exhaust housing as described in Gearcase Servicing, this section
2Remove the four impeller housing screws
3Remove the impeller housing and impeller by sliding them up and off the driveshaftThen remove the impeller drive pin and impeller plate 4Remove and discard the water tube grommet, O-ring, and seal in the impeller housing5Inspect the impeller, housing, and plate for excessive wear