2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 151Get this manual
POWERHEAD ASSEMBLYHP Install the valve spring and capCompress with Valve Spring Compressor, PIN 341446, and install keepers
IMPORTANT: DO NOT adjust tappets at this timeTappets must remain free from contact with valvesApply Gasket Sealing Compound to casing of new camshaft seal, and oil to the seal lipsPlace seal, casing up, on cam
IMPORTANT: When starting seal over the cam, be sure the lips fit properly and the seal is square in the boreUse Camshaft Seal Installer, PIN 342668, and hammer to tap the seal into placeTap until installer contacts the cylinder head