Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 121Get this manual
CYLINDER HEAD Install rocker arm plate and pivot boltsTorq ue pivot bolts to 18 1bft (24.4 Nm)aGuide PlatePivot Bolts [Torque to 18 ft(24.5 Nm)] bcGuide Plate Tabs Face UP Install rocker arms, pivots and lock nuts
IMPORTANT: Do not ighten pivots and lock nutsRocker arms must be loose until after cylinder head assembly is installed on cylinder block and head bolts torquedPush rods can then be aligned with rocker armsRefer to valve adjustment procedure at that time