1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 117Get this manual
1261 7Use sharp pencil to mark the edges of leaf valves1271 8Use pencil eraser to gently open the leaf valves to check the alignment of the valve over the portValves should be spaced evenly over portIf not, loosen mounting screws and reposition leaf valve9After leaf valve is positioned properly, install remaining screwsTighten all screws evenly to torque of 25-35 in Ibs(3-4 Nm)10Apply OMC Locquic Primer and OMC Screw Lock to the screws, leaf plate assembly to manifold11 Using new gaskets installed dry, position each leaf plate assembly and torque the screws to 25-35 inIbs(3-4 Nm)Installation 1Using new gasket installed dry, install the intake manifoldTorque the screws evenly to 60-84 inIbs(7-9 Nm)2Refer to Synchronization and linkage Adjustments, Section 1, for adjustment information