Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 356Get this manual
Internal Oil Filter Installation 1Install O-ring (a) on tank receptacle (b) Then install receptacle in tank (c)
3Install nut (a) onto tank receptacle using 23mm wrench Hold receptacle in tank using AutoSlend Service Tool Wrench (91-16748) Torque nut to 20 lbin(2.20 Nm)