Yamaha F100B F100C Outboards Factory Service Manual, Page 225Get this manual
Upper case (F100B) 3Install the O-rings into the shaft 74Install the gasket and the cover 2, and then tighten the screws to the specified torque
S60C7070
Oil pump cover screw: Nm (0.4 kgfm, 2.9 ftlb)
S60C7075
Disassembling the oil pan