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Thread: Old carb rebuild-do I need gasket dressing?

  1. #1
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    Default Old carb rebuild-do I need gasket dressing?

    Title says it all. I've forgotten if i need to treat the old fashioned gasket paper prior to install.

    After cleaning with razor.

    Seems like I should.

    All the instructions seem to speak to nitrile rings these days.

    Any of you old guys remember?

    Thanks!

  2. #2
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I never repaired a gasoline boat engine.
    I routinely use gasket sealers on auto and diesel engines.

  3. #3
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I don't recall using anything on the paper carb gaskets back on the farm... except for the Massy Harris tractor. The carb mounted from beneath, so a little grease on the paper gasket to hold it in place, while trying to ease the carb up into place.

    regards,
    Joe
    Last edited by slowpoke; 03-04-2018 at 09:33 PM.
    These days, everything I do is just "puttering around"

  4. #4
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    Default Re: Old carb rebuild-do I need gasket dressing?

    The traditional method would be Permatex #3 - but it's a beach to take back apart again. Permatex #1 is similar. Permatex also now makes gas resistant silicone.

    If surfaces are perfectly clean, flat, & smooth - you shouldn't need it. If you do use something - make sure you use as little as possible - thin, thin layer on the gasket - no globs.
    "If it ain't broke, you're not trying." - Red Green

  5. #5
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I'll second the silicon, and yes, no squeeze out to get in the way of or block anything else. The stuff I've gotten at auto parts stores is blue, works a charm, comes apart easily when necessary.
    Last edited by Gib Etheridge; 03-04-2018 at 10:26 PM.

  6. #6
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I don't believe the blue silicone is considered gas resistant & is certainly not sensor safe. While their may not be any O2, etc. sensors in this case, best to be careful.
    "If it ain't broke, you're not trying." - Red Green

  7. #7
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Well, I've used blue silicone and it worked, but here is a black fuel resistant gasket sealer. It's not silicon.

    https://www.permatex.com/products/ga...lange-sealant/


  8. #8
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    Default Re: Old carb rebuild-do I need gasket dressing?

    For carb gaskets I use this stuff, Hylomar. Basically a gel, it never hardens, won't block an orifice and you can remove the gasket or parts without damage.
    Silicone, permatex, high-tack, et-al would be problematic if you ever have to go back.



    IMG_3648.jpg
    edit;
    Hylomar®Universal Blue sealant can be used as a gasket dressing or to seal flanges with or without a gasket. Other uses include sealing finely machined joint faces (with gaps less than .01"), threaded joints, pipe threads, nuts, bolts, cylinder heads, manifolds, axles and axle assemblies. Hylomar®is resistant to a wide range of fluids including most industrial fuels, gasoline, kerosene fluids, oils, air turbine combustion products, piston engine combustion products, fluorocarbon refrigerants, water/glycol mixtures, water/brine mixtures and methanol mixtures.

    http://www.hylomarsealant.com/
    Last edited by Canoeyawl; 03-05-2018 at 12:25 AM.

  9. #9
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    Default Re: Old carb rebuild-do I need gasket dressing?

    +1 on the Hylomar. You can use it for nearly all flanges. On my old Land-Rover, which I have for 20 years now, I often make a cardboard gasket (a Kelloggs carton or similar works fine) to bridge gaps in the flanges. Put some Hylomar on the metal flanges, then assemble with the cardboard gasket.

  10. #10
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Thanks everyone!

    What a great place this is.

  11. #11
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Aviation Permatex (No 3).

    Ratus ratus bilgeous snipeous!

    You must be the change you wish to see in the world."
    Mahatma Gandhi

  12. #12
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I don't use any sealant on carburetor gaskets, ever. Always assembled dry.

  13. #13
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I thought I responded right after the question was asked, ...Hmm, .. that's what you get for living in a cell dead zone lol...

    I agree with Gordon, ......... on a carb.,... assemble dry.

  14. #14
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    Default Re: Old carb rebuild-do I need gasket dressing?

    A thin film of Hylomar. I think using a torque drive is more important then the sealer so the pressure on the gasket is uniform.

  15. #15
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Quote Originally Posted by Gordon Bartlett View Post
    I don't use any sealant on carburetor gaskets, ever. Always assembled dry.
    Absolutly correct! using sealant on a carburetor is asking for trouble! However if you`re talking about the carb. to inletmanifold joint then a very thin layer of sealant is OK but should`nt be nessesary.

    Hope that helps,

    Alan.

  16. #16
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I've only ever used grease. Kellogs "gaskets" in the old days... cornflakes variety, or gasket paper these days. A thin smear of grease. Good to go.
    "Travel is fatal to prejudice, bigotry and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome and charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime" Mark Twain... so... Carpe the living sh!t out of the Diem

  17. #17
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    Default Re: Old carb rebuild-do I need gasket dressing?

    I never use sealer on carbs, but I will use just a touch of "assembly lube" just to hold the gaskets in place as I assemble the pieces and parts. Its a clear sticky grease that comes in a squeeze tube. One tube has lasted me probably a decade...

  18. #18
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    Default Re: Old carb rebuild-do I need gasket dressing?

    This is what I was talking about...



    ...a little dab'l do ya'

  19. #19
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Thanks again everyone. Interesting variety of opinion.

    I don't know what the heck happened.

    I rebuilt the carb. Replaced the fuel lines and filter. Cleaned the gas tank (someone put a lump of dirt in it). Changed the oil. Cleaned the air filter. Guessed where the springs went from vague memory. I adjusted the carb per the manual I hunted up on the internet. I even went and got some super unleaded.

    When I pulled the starter cord, it started right up. Ran like a top. Strangest thing. I'm a little emotional right now....I really wanted that little Honda 2000.

  20. #20
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    Default Re: Old carb rebuild-do I need gasket dressing?

    Cool !

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