1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 174Get this manual
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36Place the thermostat and the seal in the cavity provided in the cylinder headSet the spring on top of the thermostat
37Apply GMC Gasket Sealing Compound to both sides of new cylinder head water cover gasket; install the gasket and coverTighten the screws to torque of 60-84 inIbs(79 Nm)
38Install the inner and outer exhaust coversCoat both sides of two new gaskets with GMC Gasket Sealing CompoundInstall and tighten the screws to torque of 48-84 in Ibs(5-9 Nm)
39Apply bead of GMC Adhesive to both sides of new bypass cover gasketInstall the bypass cover and gasketTighten the screws to torque of 60-84 inIbs(7-9 Nm)