2009 Yamaha F40 Outboard Service Manual, Page 261Get this manual

2009 Yamaha F40 Outboard Service Manual, Page 261

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Lower unit Pipe b: (commercially available) a: 31.0 mm (1.22 in) b: 25.0 mm (0.98 in) c: 20.0 mm (0.79 in)
2 Install new O-ring
Installing the shift rod, drive shaft, and oil seal housing<