1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 101Get this manual
GEAR CASE INSTALLATION 1Check that the clutch dog shifts to "Forward," "Neutral" and "Reverse" correctly by pulling or pushing the shift cam, and shift into "Reverse 2Set the shift rod (on the engine side) to Reverse3I nstall the gear case to the upper case Make sure that the driveshaft splines firmly fit into the crankshaft splines and that the water tube fits firmly into the water pumpNOTE: 6Feed Yamaha all-purpose grease, PIN LUB-GREAS-13-00, into the nipple indicated by "A" until the grease begins to overflow from "B