1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 195Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 195

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Forward Gear, Lower Drive Shaft Bearing, Pinion Gear, and Drive Shaft Installation 1 Install components in sequence shown
3 Measure distance (a) between top of nut (b) and bottom of bolt head (c