1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 83Get this manual
BRACKET UNIT ASSEMBLY NOTE:,
Always use new gaskets, oil seals, and O-ringsIf old ones are used, gas leakage or oil leakage may result due to invisible scratches or stretchesApply grease to parts when specifiedLock the tilt lock plates (inner and outer) with the reverse lock shaft2As shown, install the tilt lock plate and shallow water drive lever on the swivel bracket, and lock the tilt lock shaft with the ci rclip1