Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 180Get this manual
Remove the two 36 flange bolts and remove the thermostat cover, cover gasket and thermostat [21 THERMOSTAT
THERMOSTAT
Remove the six 22 flange bolts and remove the following:fuse holder bracket- water jacket cover-jacket cover O-ring- water tube seal- flush valve and flush valve springRemove the 20 screw and anode metalReplace the anode with new one, if it is excessively corroded