1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 146Get this manual
14Remove the upper main bearing from the crankshaftDiscard the seal and O-ring1141 15Remove the retaining clip from the center main bearingSeparate the sleeves and remove the roller assemblies 1151 16Inspect the lower main bearing in placeIf it is removed
for any reason it must be replacedTo replace the bearing, remove the retaining ringPress the bearing off using bearing separator and press
17Remove the thermostat coverDiscard the O-ring1171 18Remove the thermostat components for inspection1181 19Inspect the thermostat seatReplace the seat if necessary2045,55 Comm- Remove the 14 screws that retain the cylinder