1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 265Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 265

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4 Install armature into pumpRotate armature to align hex shaft with pump 6 Spread brushes; position brushes as shownInstall thrust washer (if equipped)
7 Install end cap and screws