1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 128Get this manual
POWERHEAD REASSEMBLY Place crankcase cover in position on cyl inder block Turn th cen lermain bolts and hex nul in L1 ITLEal lime, (following torque sequence) compressing crankshaft seal rings untit crankshaft cover has been drawn down to cylinder blockTighten bolt evenl in three progressive leps (followi ng torque sequence) ,