Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 91Get this manual
3IMPELLER PUMP aDISASSEMBLYREASSEMBLY
WATER TUBE SEAL RING
131 IMPELLER HOUSING REASSEMBLY: Align the flat surface in the center the pump with the flat side of the pinion shaft
6 28 HEXBOLT (4)
REASSEMBLY: Apply SEA LOCK #I0 the thread betfore installing
13l-I FLAT
IMPELLER PUMP REASSEMBLY: Check for wear or cracksinstall the pump the impeller housing while turning it counterclockwise181-1