Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 131Get this manual
CYLINDER HEAD
3Install rocker arm plate and pivot boltsTorque pivot bolts to 18 lb-ft (24.4 Nm)aGuide PlatePivot Bolts [Torque to 18 lb-ft (24.5 Nm)]Guide Plate Tabs Face UP 4Install rocker arms, pivots and lock nutsIMPORTANT: Do not tighten 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 time57247