2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 299Get this manual
6LUBRICATION SYSTEM 1) OIL PUMP
Compact oil pump with relief valve is used
Rotation
Relief valve open pressure: 0.4 MPa, 4.1 kgfcm2, 58 psi
Oil pump Cylinder head OUT IN
Fig22 Oil pump
2) OIL FLOW DIAGRAM
Pressurized oil SplashedLeaked oil Con-rod big end (Crank pin) Con-rod small end Cylinder sleeve Piston and related parts