1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 247Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 247

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2 Install components 3 Open valve (d) and close valve (e)4 Install fill plug5 Close Manual Release Valve (clockwise)6 Run trim "DOWN"Minimum pressure should be 500 P.S.I(35 kgcm2)
11 Fill Power