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  1. #1
    Join Date
    May 2006
    Location
    Pass Christian, Mississippi, USA
    Posts
    5

    Default "I have recently purchased a b

    "I have recently purchased a boat with a 70 HP Mercury, Ser No. OB373913. I am guessing a 90 or 91 year. Can someone identify?"

  2. #2
    Join Date
    Nov 2005
    Location
    , il,
    Posts
    2,198

    Default "[url=""]http://www.themarined

    "http://www.themarinedoctor.com/cgi-bin/YaBB.pl?board=MM;action=display;num=1137539327

    88 3cyl if you drop the first digit of your #"

  3. #3
    Rick Golden's Avatar
    Rick Golden Guest

    Default "I have a 1989 70 HP mercury O

    "I have a 1989 70 HP mercury OB motor that I finally got running well. Now I am having a problem with the tilt going up & down. Does anyone out there know where the manual release would be, if there is one? The manual I have says there is one, but I can not locate it.
    Thanks in advance."

  4. #4

    Default Re: Mercury 70 HP Year

    I have a 1989 Mercury 70 HP and it died and wouldn't turn over. I knew what that meant but didn't want to believe it. Yes it seized..I tore into it to rebuild it and the number 3 cylinder has some grey color in it and is dry and the plug has the same. The other 2 cylinders are good. I know this is a common problem but what made it grey? Misfire? Not cooling properly? Contaminated fuel? As you see I been doing a lot of reading. Has anyone ever seen this? What can I do to prevent it happening again?

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