1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 217Get this manual
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Upper Mount Nut (2) [Torque to 80 lbft(108.5 Nm)] Bolt (2) Rubber Space (2) Washer (2) Bolt (4) [Torque to 23 lbin(31.2 Nm)]
Lower Mount Clamp Ground Strap Bolt (2) [Torque to 15 lbft(20.