Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 135Get this manual
7Remove bolts which secure crankcase cover to cylinder blockUse Powerhead Stand (91-30591Alfor rotating crankshaft to desired position for removal of connecting rods 10Using an awl or electric pencilscribe the cylinder identification number on each connecting rod as shownReassemble connecting rods in samecylindero
a Crankcase Cover