Honda BF75, BF100, BF8A Outboard Motors Shop Manual, Page 95Get this manual
DISASSEMBLY AND SERVICE GEAR AND EXTENSION CASES (BF8A extra long shaft)
ROD JOINT
VERTICAL SHAFT ASSEMBLY: Connect the vertical shaft to the pinion shaft and crankshaft
DISASSEMBLY: Remove the joint to separate the gear case from the extension case ASSEMBLY: Screw the joint all the way down, then unscrew it turns
EXTENSION SEPARATOR
DOWEL PIN (2)
079738810001 WATER TUBE GUIDE ASSEMBLY: Install the tube so it does not interfere with the vertical shaft Place the guide over the water tube, and position it on the extension case with dowel pin at each end