1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 169Get this manual
Cleaning
INote components must be perfectly clean and free of Before inspecting or assembling powerhead, all internal
contaminants 1Remove any carbon accumulation from exhaust port areas2Remove any carbon accumulation from cylinder head combustion chambers3If cylinder wal1s are glazed from extended use, use medium grit hone to resurface wallsUse slow RPM to achieve strong "crosshatch" pattern for best oil retention al1d ring sealing
P.t To avoid personal injury, wear eye protection and rubber
gloves when using OMC Gel Seal and Gasket Remover
1231 Use OMC Gel Seal and Gasket Remover to remove all
traces of gaskets, adhesives, and Gel Seal II from the cylinder block and crankcase5Carefully 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 cleaning