Carburetor float sealant

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  • This topic has 15 replies, 9 voices, and was last updated 1 month ago by TubsTubs.
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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217257

    Hey folks, I’m working on my grandfather’s Johnson 5hp AT39. The float seems to be in good condition, but whatever was put on as a sealant is flaking off. I just finished cleaning the carb out so I don’t want to have to do it again soon. What do you guys recommend to reseal the cork float? I’ve seen people say SealAll or epoxy so far.

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    lyks2tinkr

    US Member - 2 Years
    Replies: 351
    Topics: 42
    #217267

    After you clean off any flaking coating you can recoat it fuel proof model airplane dope.
    Drys fast a light weight.
    I think its called Aero gloss.

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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217294

    Ok, thanks

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    reivertom

    US Member - 2 Years
    Replies: 713
    Topics: 44
    #217302

    Some people swear by coating them in super glue. I’ve never tried it, but I’ve read about folks using it. I’d research a bit more before I tried.

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    aquasonic

    US Member - 2 Years
    Replies: 411
    Topics: 32
    #217313

    If this motor has a similar carburetor to a “T” series motor, then the best solution, by far, is to replace the float with a modified Mercury float. Then you will have a modern plastic float that is fuel resistant.

    I have read many of these threads on coatings for cork floats, and for every product that gets recommended, someone has a negative experience. Some of the problems with coatings may be due to a lack of curing time, and/or lack of preparation.

    • This reply was modified 1 month ago by Avataraquasonic.
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    stanley

    US Member - 1 Year
    Replies: 417
    Topics: 105
    #217314

    The easiest thing to do is recoat with shellac and use ethanol free gas.Member “Tubs” has posted results of his experiment,of several years,that shows no difference in coated and uncoated cork floats in antique outboards.

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    leeinnh


    Replies: 27
    Topics: 4
    #217315

    well, as y’all know, shellac was the original coating. Ethanol seems to eat through everything.

    The Aero Gloss clear hot fuel proof dope is available at hobby stores. I have used that for

    2 decades on my 3 hp omc motors with good luck. now there is a carb kit that comes with

    the plastic float replacement.

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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217317

    The float is just a 1″ diameter cylinder that is 1″ tall with a vertical pin through the center. Luckily I’m still able to get ethanol free gas in my area, so that’s what I’ll be using.

    There are carb kits available for this motor? What’s included?

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    crosbyman

    Canada Member - 1 Year
    Replies: 1672
    Topics: 199
    #217321

    Sounds like you can use a Mercury motor float by altering it a bit by drilling a hole top to bottom

    the rest is mostly a good soak & clean and blow out of all passages

    see pic

    Joining AOMCI has priviledges 🙂

    • This reply was modified 1 month ago by Avatarcrosbyman.
    • This reply was modified 1 month ago by Avatarcrosbyman.
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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217326

    Thanks for the info. On a related note, the check valve screw is super tight and I can’t back it out without stripping the head. Is it safe to use an impact screw driver to try to get it out or am I likely to damage the carburetor? Can anyone recommend a screw driver that actually fits? The wide head slotted screwdrivers all seem to be too thick in the blade to fit.

    Buccaneer
    Buccaneer

    US Member - 1 Year
    Replies: 4159
    Topics: 990
    #217328

    I often find myself grinding down an old screwdriver to fit such items on carbs.
    After that, it’s a judgement call on whether or not it’s worth snapping it off
    or clean the carb best you can with it in.

    Prepare to be boarded!

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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217330

    For the time being I’m going to proceed with it stuck in place. If the motor doesn’t run I’ll revisit the problem.

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    aquasonic

    US Member - 2 Years
    Replies: 411
    Topics: 32
    #217335

    mercury-float

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    Swarlos

    US Member - 1 Year
    Replies: 10
    Topics: 6
    #217342

    Would the Mercury float being a little shorter cause any problems?

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    aquasonic

    US Member - 2 Years
    Replies: 411
    Topics: 32
    #217381

    No the height is not a problem. The hole will need to be drilled to a larger diameter to fit your brass float needle. An additional tiny hole will need to be drilled on the flat top for the tiny brass wood screw. The wood screw holds the wire clip, and the clip goes into the groove on the needle. The whole clip and groove assembly keeps the top of the float at the correct height, and that’s what’s important.

    Regarding the check valve, I have used an impact driver to loosen them, but with a light hammer, and abundance of patience. Those carbs are pretty rugged. The valve and screen usually need a cleaning, or the low speed circuit will not work well.

    • This reply was modified 1 month ago by Avataraquasonic.
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