Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 421Get this manual
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NON-BIGFOOT GEAR HOUSING
b AntiVentilation PlateRetaining Bolt and Washer; Torque Bolt to 15.8 Ib-ft (21.4 Nm)
90857046 AUGUST 1998
Page 6A-49