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Thread: lower unit, 1990, 25 hp, Mariner

  1. #1
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    Default lower unit, 1990, 25 hp, Mariner


    Traded a fellow a boat for some fishing tackle, a couple of rods and reels and a 25 hp, 1990 Mariner outboard (electric start). I just stored the motor in my boat shed all winter. Recently I got it out and it would not turn over with a battery I new was hot and good. It did finally start one time and ran good but it died and then would not turn over again. I thought it was something wrong in the power head but I was wrong, apparently it had water in the foot and the housing had frozen and busted right down either side of the threads at the plug where you put oil in the lower unit. It must have had bad seals. When we took the lower unit off the motor turns over good and free. The motor seems worthy enough to repair.

    It has that shift on the tiller handle.

    If any of you guys know of a lower unit or even just the housing I would like to know about it. I am located in SW Arkansas. The nut inside the housing that has to be removed, most likely with a special tool, has some of the ears sheared off it, I hope I can get it off if I just replace the housing. Any advice on that would also be greatly appreciated.

    Thanks for checking out the post.

  2. #2
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    Cray is offline Crappie.com 2019 Man of Year, Supermod & Moderator of the Mechanics Forum * Crappie.com Supporter
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    At this point you don't have anything to lose. Take a large punc and hammer,get on what is left of the ears,tap on it to try and get it moving. If that dosnt work go to a Cold chissel. If you have to split the nut and take it out a piece at a time. Don't want to put down someone I don't know but I'm betting that damage was already done. Freezing and busting the case shouldn't have affected anything that would keep the motor from turning over if it is in neutral. Sounds more like something broke while running and busted the case.
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  3. #3
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    you can register and post here. i've found some really odd ball parts here. you will be surprised what parts people have just laying around. good luck, rick The Antique Outboard Motor Club Forums - Webvertize

  4. #4
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    I have a Mariner parts motor if you are interested PM me, boat was turned over in a tornado breaking the ounting brackets and the cowling but he powerhead and foot are in good shape.
    1990 Stratos 285 Pro 200 HP Merc
    SpyderLok Rod Holders
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  5. #5
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    make sure it is not a japan mariner if it is its got a yamaha lower unit on it
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    of the 2011 winners of the c.d.c. lake hartwell fall fest

  6. #6
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    Quote Originally Posted by fishbaskett View Post
    How do you know the difference?
    How do you know the difference? SN# OC251525

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    Looked yours and mine up, what I have is the same, everything on our motors is interchangable.
    1990 Stratos 285 Pro 200 HP Merc
    SpyderLok Rod Holders
    Proud Member of Team Watch The Finger!!!
    (662) 458-8925

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