1991 Yamaha Outboard Factory Service Manual 9.9 and 15 HP, Page 88Get this manual
Shift mechanism 1I nsert the shift rod into the bottom cowling GEAR CASE DISASSEMBLY Preparation for disassembly Remove the gear case from the upper casingSee page 5-1 for removalTo disassemble the gear case, hold it with repair standIf no repair stand is available, grip the skeg in viseTo protect the skeg against damage, wrap it with rag, Water pump 1Remove the four screws on the water pump housing, and remove the water pump housing from the gear case2Remove the impeller and woodruff key from the driveshaft, and remove the outer plate cartridge and water pump gaskets