1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 165Get this manual
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43Remove thermostat cover and spring44Remove thermostat assembly and inspect45To assemble the thermostat, insert pin into vernatherm with convex end of pin facing out46Position vernatherm in sealPosition retainer and spring in thermostat housingAssemble halves
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47Install the thermostat assembly into the cylinder head with the pin end of thermostat facing outwith
ave Gasket Sealing Compound
48Lightly coat both sides of new thermostat cover gasket Position the relief spring
49Install the thermostat coverApply ave Gasket Sealing Compound to threads of the cover screwsInstall the screws and torque them to 60-84 inIbs(7-9 Nm)