1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 205Get this manual
CYLINDER BLOCKCRANKCASE
5Install the other bearing halves into the crankcase
NOTE: Align each bearing projection with the notch in the crankcase
a-Crankcase Bearing Halves 6Install crankcase onto cylinder block7Apply oil to the cover bolts and torque cover bolts in sequence and in two stepsIMPORTANT: Do not move crankshaft until measurement has been completed