1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 99Get this manual
Assembly
1Place leaf valves on leaf plateIf new valves do not seat on the leaf plate, turn the leaf valves over
INotel Used leaf valves must not be turned over for reuseLeaf valve may break when returned to service, causing serious powerhead damage
2If any leaf valves are standing open, apply light pressure using pencil eraserIf leaf valve closes with light pressure, valve is acceptableIf not, inspect leaf plate for high spots or burrsI Note Do not lap leaf platesIf plate is too smooth, the leaf valves may stick closed after off-season storage1254
3Apply OMC Locquic Primer to mounting screws and allow to air dry
4Apply ONK: Screw Lock to mounting screwsWipe off excess adhesive
5Assemble leaf valve shim (if required) and leaf stopInstall two screws near center of leaf stopDo not tighten[] 6Hold leaf valve assembly in horizontal positionThis will usually align leaf valves over ports in leaf plateTighten the two screws evenly[] 7Use sharp pencil to mark the edges of leaf valves