Mercury Force 9.9, 15HP Outboards Service Manual, Page 139Get this manual
6 Inslall assembled pistons into bore Coat pi ston and cylinder bore with oilSet assembled piston in bore, open end of piston pi facing top of cylinder
NOTE: Check that staking pins are in ring gaps and rings are properly positioned in their grooves
IMPORTANT Damage to piston andor ring may result from imperfect alignment of ring gap and staking pin Place ring compressor (Special Tool NoFT -2997) over piston Compressor should rest on cyli nder sleeveTap top edges of com pressor, making it uniformTighten compressor until piston rings are comp ressed suffic ientl to enter bore Push piston into bore with thumb pressu reIMPORTANT