2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 133Get this manual
POWERHEAD OISASSEMBLYHP Mark valves for location and removeRemove camshaft seal using Slide Hammer, PIN 432128, and Large Jaw Puller, PIN 432129Discard seal
IMPORTANT: Remove valve seals carefully, using pliers, to avoid damaging guideReplace valve seal and spring assembly whenever removed