2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 147Get this manual
Power unit
5Install the remaining half of the main bearings into the crankcaseNOTE: Install the main bearings in their original positions Insert the projection of each bearing into the slots in the crankcase6Install the crankcase onto the cylinder block and apply engine oil to the threads of the crankcase bolts7Tighten the crankcase bolts to the specified torques in stages and in the sequence shown
NOTE: When loosening the crankcase bolts, loosen them in the opposite order used for tighteningCrankshaft journal oil clearance: 0.0110.039 mm (0.00040.0015 in)
Selecting the crankshaft main bearing
1Check the stamped marks and on the crankcase cover and cylinder blockS6AG5830