1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 197Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 197

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DETERMINING FORWARD GEAR BACKLASH

4 Rotate drive shaft to 10 revolutionsThis should properly seat forward gear tapered roller bearing
6 Position Dial Indicator on appropriate line (