1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 13Get this manual
Gear Housing Lubrication AWARNING
To avoid accidental starting, disconnect spark plug Ignition wirebefore working near the propeller2Note th color of gear lubricantWh ite cream color indicates presence of water in lubrican tCheck drain pan fo water separation from lubricantPresence wa ter in gear lubrican ind icates th need for di sassemblyand inspection of oil seals, sea su rfaces," rings nd gea housi ng com pone nt s
ACAUTION
DO NOT usautomotive gre.lIn the gear hou lngUn only Quicksilver Super-Duty Lower Unit Lubricant
SALT WATER CORROSIONGEAR HOUSING BEARING CARRIER and COVER NUT
Salt wa ter co rrosion build up CD split gear housing nd destroy ent ire gear ho using assemblyTo protect agains such da mage, th ereforeit is reco mmended that the gear ho us ing beari ng carrier and gear ousing cover nu be lubr icated regular basisas fo llows: Ser vice fir st at the 20hour inspectionth en on an annua basisBcmovc th cover nut and enti re bearing carrier to adequa tely clea corrosive deposit and driedup lubrica nt from both ends of th beari ng carrier, as well as the gear housi ng internalt hreads and cover nut external threadsAppl libera amount of Perfect Seal to th ends of the beari ng carrier nd to th gear hou sing and cover nut th readsthen reassemble and relorq ueBe caut ious that Perfect Seal does nol gel inlo the bearing assemb liesRefer to gear housi ng disassembly and reassembly (Secti on 5)