1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 202Get this manual
36Place the thermostat and the seal in the cavity provided in the cylinder headSet the spring on top of the thermostata new cylinder head water cover gasket; install the gasket and coverTighten the screws to torque of 60-84 inIbs(79 Nm)
r;;;l 37Apply OMC Gasket Sealing Compound to both sides of
38Install the inner and outer exhaust coversCoat both sides of two new gaskets with OMC Gasket Sealing CompoundInstall and tighten the screws to torque of 48-84 inIbs(5-9 Nm)39Apply bead of OMC 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)
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40Slide new leaf plate gasket over the crankcase studs, then install the leaf plateDo not use sealer on the gasketApply OMC Gel-Seal II to the threads of the flat head screw, then install and tighten the screw