Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 296Get this manual
CRANKSHAFT, PISTON AND CYLINDER BODY (6)Install the crankcase onto cylinder body 2(7)Tighten the crankcase mounting bolt 5
Apply engine oil onto the thread and seat of the crankcase mounting boltTighten the crankcase mounting bolt in sequence and two steps of torqueCrank case mounting bolt: 1st: 15 (1.5 kgf m, 11.1 ft lb) 2nd: 30 (3.0 kgf m, 22.1 ft lb)