1992 Johnson Evinrude "EN" 9.9 thru 30 Service Manual, P/N 508142, Page 235Get this manual
Water Pump Servicing25 Comm 28 Disassembly
1Remove gearcase as described in Gearcase Servicing, this Section
2Remove the four impeller housing screws with washersSlide the impeller housing and impeller up and off the driveshaftRemove the impeller drive pin
3Pry under the impeller plate to loosen itSlide the plate up and off the driveshaftScrape all gasket material from the plate, gearcase, and impeller housing4Remove and discard the impeller housing seal and water tube grommet5Inspect the impeller, plate, and housing for excessive wearAssembly