2009 Yamaha F40 Outboard Service Manual, Page 318Get this manual
Exhaust manifold and oil pan 5Install new gasket n, the exhaust manifold o, and the rubber seal p, and then tighten the exhaust manifold bolts temporarily q o
6Tighten the exhaust manifold bolts to the specified torque, and then tighten the oil pan bolts mExhaust manifold bolt q: 11 Nm (1.1 kgfm, 8.1 ftlb) 7Install new gaskets r, the plate s, and the muffler t, and then tighten the bolts u