Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 23Get this manual
Service Data 2.Cooling Water System Diagram
Thermostat1
Cylinder (with cylinder head)2
7 Water Discharging Passage in Drive Shaft Housing
6 Water Feed Passage in Drive Shaft Housing
Cooling Water Check Port5
Water Pipe9