Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 201Get this manual
5Lift commutator end plate (a) from motor frame (b) Retain springs (c) and steel ball (d)6Lift motor frame (b) from reservoir 7Pull armature out of reservoir
IMPORTANT: Make note of thrust washer stack up on armature shaft during motor disassembly, as thrust washers must be reinstalled in same sequence when reassembling motor