Honda BF8, BF9.9 and BF10 Outboard Motors Shop Manual., Page 79Get this manual
5) Remove the O-ring, pump impeller and impeller liner from the impeller housing 11I IMPELLER1i 1
[21- IMPELLER LINER
6) Remove the impeller cover and gasketReplace the gasket with new one when the gasket is removed
141 O-RING
[I] IMPELLER COVER