1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 196Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 196

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6 Assembly Pinion Gear Locating Tool (91-12349A2) as shown; do not tighten collar retaining bolt at this time 10 Install the number "3" locating disc against bearing carrier shoulder in gear housing11