Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 83Get this manual
fASSEMBLY 11 mm WASHER BOLT (4) and type: 50 mm XL type: 90 mm
[51 IMPELLER
1161 mm WATER SEAL
[I31 2.5 11.8 mm PIN (2)
1) Install new mm water seal, if it was removed;
aClean off any grease or oil from the water seal installation area of the water pump housing