Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 132Get this manual
31) Installation of Water Pump 1Attach new gaskets and 2, water pump guide plate and dowel pin 4
a Projection and 2
Do not reuse
Attach key to drive shaftBring impeller groove to key and install impeller to drive shaft Apply grease to the key to prevent it from dropping when attachingG RE AS E