Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 383Get this manual
Internal Oil Filter Removal 1Remove main bodySee page 182Remove internal oil filter (a) by sliding the assembly down the oil pump inlet tube (b) Then remove spring (c)
4Remove O-ring (a) from tank receptacle (b)
5Remove tank receptacle (a) from tank (b) Then remove O-ring (c) from receptacle