1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 253Get this manual
Disassembly 1Remove the propeller or test wheel from the gearcase Inspect the condition of the propeller hub EI
2 Drain the gearcase by removing first the oil level plugthen the oil filldrain plug CD
3Remove the copper water tube from either the water pump or the exhaust housing
4 Remove the four impeller housing screws with washersSlide the impeller housing and impeller up and off the driveshaftRemove the impeller drive pin Pry under the impeller plate to loosen itSlide the plate
EJ up and off the driveshaftScrape all gasket material from the