1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 147Get this manual
L!!J Protect the condition of the piston by packing paper towels
r:;:;l 23Carefully remove the pistons from the cylinder block
between the connecting rod and piston Do not allow the connecting rod to touch the inside of the piston or the cylinder wall24Using an appropriate ring expander, remove piston rings from both pistons
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25Using tool as drawn on Page 4-8 or OMCRetaining Ring Pliers PIN 325937, remove all wrist pin retaining ringsDiscard retaining rings
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26The fit between the wrist pin and bosses of the piston is loose on both sidesPush the wrist pin through to free the piston from the connecting rod If necessary, use OMC Piston Cradle PI 326573 and OMC Wrist Pin Pressing Pin PIN 326356With the piston skirt flush with the cradle, press out the wrist pin using an arbor pressBe careful not to lose any of the 28 needle bearings or the two wrist pin washersIf any of the bearings are worn or lost, replace all the bearings on reassembly22664