Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 261Get this manual
CYLINDER BLOCKICRANKC ASE
3Connect vent hose, secure with cable tie
aVent HoseCable Tie 4On electric start models, install battery cables on engineConnect the battery cables to the batlery5Connect the power trim wires (if so equipped)6Install bottom cowl