Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 105Get this manual
Power Unit 37) Assembly of Cylinder and Crank Case
12Place cylinder block upside down on the work benchUP
Bring piston crown "UP" mark to flywheel side piston ass'y on the cylinder block to assembleBefore assembling, apply engine oil to piston peripheral surfaces, piston rings and cylinder liner, set
Attach slinger 4Install oil seal to crank shaft ass'y 6Apply grease to lip of oil seal before installing itG RE AS E