1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 148Get this manual
Cleaning
INote Before inspecting or assembling powerhead, all
internal components must be perfectly clean and free of contaminants 1Remove any carbon accumulation from exhaust port areas 2Remove any carbon accumulation from cylinder head combus tion chambers3 If cylinder walls are glazed from extended use, use medium grit hone to resurface wallsUse slow RPM to achieve strongcrosshatch" pattern for best oil retention and ring sealing
To avoid piston or cylinder block damage, restore the chamfer to all port edges using ball hone or other suitable toolTo avoid personal injury, wear eye protection and rubber gloves when using OMC Gel Seal and Gasket Remover
f11 4Use OMC Gel Seal and Gasket Remover to remove all traces gaskets, adhesives, and Gel Seal" from the cylinder block and crankcase 5Carefully remove any carbon accumulation from the tops and ring grooves of the pistonsA ring groove cleaning tool can be made by breaking an old ring and grinding an angle on its endDo not damage ring grooves while cleaning6Thoroughly wash entire cylinder block and crankcase with warm, soapy water to remove all traces of contaminants