Yamaha F100B F100C Outboards Factory Service Manual, Page 196Get this manual
Lower unit
Installing the propeller shaft housing
1Install the washer 1, propeller shaft assembly 2, into the propeller shaft housing assembly 32Apply grease to the new O-rings
NOTE: Secure the ring nut by bending one tab into the slot in the ring nut and the other tabs toward the propeller shaft housing assemblyRing nut wrench 8: 90890-06511 Ring nut wrench extension 9: 90890-06513 3Install the propeller shaft housing assembly into the lower case, and then install the straight key 5, claw washer 6, and ring nut 74Tighten the nut to the specified torqueRing nut 7: 103 Nm (10.3 kgfm, 74 ftlb)