2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 153Get this manual
POWERHEAD ASSEMBLY3.5 Use suitable tool to compress the piston ring and install the piston into bore of the cylinderCheck piston ring for spring tension through exhaust port by pressing it with screwdriverIf piston ring fails to return to its position, it is likely that the ring was broken during installation and must be replacedInstall the crankshaft assembly on cylinder block and rotate bearings so that the locating pins are positioned in notches of the cylinder block
1Notches
Apply Screw Lock to threads of leaf valve screwsInstall the leaf valve and stopTighten the screws to torque of 27 to 35 inlb(3 to Nm)1Piston ring
Install upper and lower retainers on cylinder blockInstall new upper crankshaft seal with the lip facing the crankcaseInstall new lower crankshaft sealsInner seal lip faces the crankshaft and the outer seal lip faces crankcase headScrews