2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 146Get this manual
POWERHEAD DISASSEMBLY68 Remove the crankcase to cylinder block screwsMark and remove the connecting rod caps and bearings
IMPORTANT: Loosely install the cylinder head to prevent the pistons from falling out when the crankshaft is removedTurn the powerhead so that the intake manifold surface faces upUsing rawhide mallet, lightly tap upward on the crankshaft until the halves just begin to separateLift up and remove the crankcase
Lift the crankshaft out of the cylinder blockReplace the connecting rod caps on the rodOrient them exactly as they were before you removed themInstall the screws finger tightRotate the powerhead so the cylinder head faces upRemove the cylinder head and gently push up on the connecting rods to remove No1 and No.2 piston assembliesDo not allow the connecting rod to contact the cylinder wall or inside of the piston skirt during handlingRemove upper crankshaft seal, upper main bearingseal ring, and center main bearing from the crankshaftDiscard seal ringThe lower crankshaft bearing should be removed only for replacementInspect crankshaft sealsleeve assemblyIf necessary to replace, grind the sleeve, being careful not to damage the crankshaft