Honda BF35A-BF45A Outboard Motors Shop Manual., Page 417Get this manual
CYLINDER, PISTON, OIL TANK CAUTION: Do not reuse the O-ring8 Do not use shop towel, cloth, gloves, etcwhen reassembly8 Assemble the parts with care not to let the foreign particles and dirt enter the valve body and gear pump assembly1) Clean the parts in the fresh ATFCheck that the parts are free from contamination with dust and dirt before
reassembly
[I]UPPER JOINT METAL
44 N-m, (4.5 kgf-m, 33 1bf-ft)
[4] CYLINDER