1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 154Get this manual
3Tighten the thermostat housing and cover securely
rn 4Install new thermostat housing O-ring and cover O-ring onto the thermostat assembly.5Install the thermostat assembly in the cylinder headTighten to 60-84 inIbs(7-9 Nm)