Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 21Get this manual
allow it to drainReconnect the tube after drainingTrapped water may freeze and expand, thus cracking gear housing andor water pump housingCheck and refill gear housing with Quicksilver Gear Lube before storage to protect components against rustInspect gaskets under lubricant vent and fill plugsReplace any damaged gaskets before reinstalling plugs11Store battery as outli ned inQutofSeason Battery Storage," following How Weather Affects Engine Performance
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Out-of-Season Battery Storage
1Remove battery as soon as possible and remove all grease, sulfate and dirt from top su rface 234Cover plates with disti lled water, but not over 316 in (4.8mm) above perforated bafflesCover terminal bolts well with greaseStore battery in COOL, DRY place in dry carton or boxENGINE RPM