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  1. #1
    RC Competitor
    Join Date
    Apr 2012
    Posts
    63

    Trx 3.3 air leak test

    I was wondering if there was a effective method for checking for air leaks?

  2. #2
    Marshal Double G's Avatar
    Join Date
    May 2008
    Location
    Tanker 822
    Posts
    9,632
    Plug the carb throat and the exhaust outlet, connect a new, unused fuel line to the carb and blow into it and brush soapy water over the parts that connect to the block. Expect a little leakage from the front bearing.
    The Super Derecho

  3. #3
    RC poster
    Join Date
    Jul 2013
    Posts
    4
    this will fix an air leak right http://www.bukupower.com/CrankCaseCaps.aspx you may have to cut the diameter to make it fir a small block engine.

  4. #4
    RC Turnbuckle Jr. Nitronaught's Avatar
    Join Date
    Oct 2005
    Location
    South Florida
    Posts
    18,473
    Quote Originally Posted by Sparse Tastic View Post
    this will fix an air leak right http://www.bukupower.com/CrankCaseCaps.aspx you may have to cut the diameter to make it fir a small block engine.
    Any bearing is going to pass some fuel, it's not a 100% seal. If the bearing is leaking, chances are the bearing itself may have issues... Something caused the seal to leak, usually it's a faulty bearing or bearing race but most common, the bearing retainer....

    Best to replace a leaking bearing than cover it up. The best way to tell if your bearing is leaking bad enough for replacement? Besides having a high idle and pretty much impossible to get a decent tune, you will find the back of your flywheel will be wet with clean fuel and probably it has slung fuel all inside the lid, and lastly some puddling under the flywheel on the chassis....
    Founder of H.U.A.
    Hop Ups Anonymous

  5. #5
    RC Qualifier
    Join Date
    Jan 2013
    Location
    Gurley, Alabama
    Posts
    766
    Nitronaught, I couldn't agree more. Masking a leaking engine bearing can get expensive when the engine is destroyed by bearing shrapnel.

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