Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 119Get this manual
52Remove 13 bolts from crankcase cover 54Remove bolts from bottom end cap
aBoltsEnd Caps
55Use rubber mallet to break adhesion between crankcase cover and block and remove crankcase coverNOTE: Before removing rod caps from connecting rods, crankshaft should be rotated so that piston of connecting rod that is to be disassembled covers ports to prevent rod bearings from falling into ports when rod caps are removedCrankcase Cover