1997 Johnsoon Evinrude "EU" 50 thru 70 3-Cylinder Service Manual, P/N 507266, Page 162Get this manual
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43Remove thermostat cover and spring44Remove thermostat assem bly and inspect
45To assemble the thermostat, insert pin into vernatherm with convex end of pin facing out46Position vernatherm in sealPosition retainer and spring in thermostat housingAssemble halves
47Install the thermostat assembly into the cylinder head with the pin end of thermostat facing out48Lightly coat both sides of new thermostat cover gasket with 0It'k: Gasket Sealing CompoundPosition the relief spring
49Install the thermostat coverApply 0It'k: Gasket Sealing Compound to threads of the cover screwsInstall the screws and torque them to 60-84 inIbs(7-9 Nm)