1994 Johnson/Evinrude "ER" 9.9 thru 30 outboards Service Manual, Page 181Get this manual
Cleaning Before inspecting or assembling powerhead, all internal components must be perfectly clean and free of contaminants1Remove
wear eye protection and rubber 4Use OMC Gel Seal and Gasket Remover to remove all traces of gaskets, adhesives, and OMC Gel-Seal"
from the cylinder block and crankcase5Carefully remove any carbon accumulation from the tops and ring grooves of the pistonA
ring groove cleaning tool can be made by breaking an old ring and grinding an angle on its endDo not damage ring grooves
while cleaning 6Thoroughly wash entire cylinder block and crankcase with warm, soapy water to remove all traces of contaminants
i compressed air pressure at less than 25 PSI (172 kPa) To avoid personal injury, wear eye protection and set 7Air dry cylinder