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carburettor gasket leak - fix?

  • 05-01-2012 9:50pm
    #1
    JMSE
    Registered Users, Registered Users 2 Posts: 906 ✭✭✭


    I'm fixing up an old engine and have a bit of a prob. The carburettor bowl gasket is new and a genuine part but is not forming an airtight seal and petrol leaks out around the gasket within a minute of the bowl starting to fill. Is there any type of sealant I can use in this petrol environment.


Comments

  • #2
    crosstownk
    Registered Users, Registered Users 2 Posts: 12,863 ✭✭✭✭crosstownk


    Buy some gasket paper and tap the shape gently with a light hammer.

    The old ways are the.............oops! Showing my age now!!
    Untitled Image




  • #3
    dr.fuzzenstein
    Banned (with Prison Access) Posts: 16,620 ✭✭✭✭dr.fuzzenstein


    As above, cut out a paper gasket and maybe some of this stuff.


  • #4
    PrzemoF
    Registered Users, Registered Users 2 Posts: 1,931 ✭✭✭PrzemoF


    Make sure that the surfaces are perfectly flat.


  • #5
    245
    Closed Accounts Posts: 760 ✭✭✭245


    Its not supposed to form a totally tight seal. The problem is that the bowl is overfilling. In most cases that's because the needle valve isn't closing fully (if you remove it and blow through it both ways you'll probably find that its not shutting off the fuel). The other possibilities are that your needle valve is too big or that your float is incorrectly adjusted.

    Do not try to solve the problem by using sealant. The leak is a fire hazard so do yourself a favour and get it sorted.


  • #6
    CJhaughey
    Registered Users, Registered Users 2 Posts: 14,907 ✭✭✭✭CJhaughey


    Don't use acetic cure silicone sealant in contact with petrol, it goes all soft and will fail.
    Loctite 510 would be what I would use to seal something in contact with petrol.
    But I agree with the above poster, it sounds like your float height is wrong and the carb is overfilling.


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