1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 265Get this manual
4Install armature into pumpRotate armature to align hex shaft with pump 6Spread brushes; position brushes as shownInstall thrust washer (if equipped)
18464ArmaturePump
18457BrushesThrust Washer
5Install field and frame assembly onto pump as shown