2009 Yamaha F40 Outboard Service Manual, Page 223Get this manual
Power unit 6Install the camshaft in the direction of the arrow, and then install new gasket and tighten the retaining bolt o
4Lightly tap the valve spring retainer with plastic hammer to set the valve cotters securely
7Align the dowel hole in the camshaft with the" mark on the cylinder head
8Install the rocker arms p, q, and washers into the rocker arm shaft s, and then install the tensioners t, the stoppers u, the washers v, and the rocker arm shaft bolts w