1978 Johnson 55 HP Outboards Service Manual, Page 65Get this manual
fLift retaining ring out of groove and slide aside to remove the crankshaft center main roller bearing for cleaning and inspectionThe top main bearing and seal assembly with "0" ring slides offIf necessary to remove the bottom main bearing, remove Truarc ring and use an appropriate bearing pullerSee Figure 5- 22 "0" RING
Figure 5-23Removing Piston Pin Retaining Ring
iUsing an arbor press, press wrist pin throug'h to free piston from rod