2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 157Get this manual
POWERHEAD ASSEMBLYHP Install Crankshaft Pulley Nut RemoverInstaller, PIN 342669, on crankshaft taper aligned with keyway and secure in place with flywheel nutUse crowfoot wrench to torque nut to 18 to 20 ftIbs(24 to 26 Nm)Rotate cam pulley clockwise to align mark with extrusion on cylinder headAlignment marks
With flywheel and cam sprocket in position, install belt on cam pulleyRemove flywheel