2009 Yamaha F40 Outboard Service Manual, Page 317Get this manual
Bracket unit Installation depth a: 0.51.0 mm (0.020.04 in) 2Install new gaskets and onto the exhaust guide b3Install the relief valve and the oil strainer h
6Remove the oil seal p
Checking the oil pan and exhaust manifold
1Clean the removed parts2Check the exhaust guide, the exhaust manifold, and the mufflerReplace if corroded or cracked3Check the oil panReplace if corroded or cracked
Checking the oil strainer
1Check the oil strainerClean if there is dirt or residues
Checking the exhaust guide anode