1999 "EE" Evinrude 5 thru 15 4-Stroke Service Repair Manual, P/N 787022, Page 181Get this manual
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Valve Lash Adjustment
4 Apply OMC Triple-Guard grease to new O-ring seal and install it inside of coverApply OMC Gasket Sealing Compound to screw threads and install cover on headTorque to 84-10