1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 166Get this manual
Disassembly Check the inner exhaust cover for pitting and flatness If pitting exists or the cover is warped, discard it and replace with new cover during reassembly
1Remove the three screws retaining the crankcase head to the powerheadUsing mallet and punchdrive the seals from the crankcase headDiscard the O-ring and seals2Remove the exhaust cover screwsIf necessary, tap he exhaust cover edge with rawhide malletRemove the inner and outer exhaust covers; carefully separate the pieces