1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 100Get this manual
POWER HEAD DISASSEMBLY Rotate crankshafllO desired position for removal of con nect ing rod sUsing an awl or electric pencil scribe the cylinder identification number (a) on each con necting rod as shownReassemble con nect ing rods in same cy linder
Use12 point soc ket to remove connecting rod ha ilS, th en remove rod caproller bearings (18 per pis ton) and bearing cage rom connecting rod
IMPORTANT SERVICE NOTE To prevent Roller Bearings from failing Into cylinder ports, block off the cylinder ports by raising piston up In cylinderDrop Roller Bearings into Pi ston