Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 248Get this manual
11 Install starboard transom bracket, steering retaining nut (models with thru-tilt tube steering), and motor wires; refer to "Installation" instructions inPower Trim Assembly Removal and Installation," preceding 2To replace brush card, remove plastic insulators (a)
Brush Replacement ("Square" Motor)
1Brush replacement is recommended if brushes are pitted, chipped, or if distance (a) between the brush pigtail and end of brush holder slot is 116 inor lessCheck the distance with armature installed, as shown