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  1. #1
    RC Champion
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    Sep 2004
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    Woodhaven, MI
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    2,075

    Big Bore owners.. How do you get em to seal!?!

    I cannot, for the life of me, get my big bores to seal! Bottom is fine, but the caps leak like a broken dam. I do a fair amount of tuning and such, so oil has been changed in them a few times already, but they will not seal. I have tried cleaning and drying both caps and bladders with no luck. Teflon tape on the threads seems to make it worse... Anyone have some pointers for me?

    The way i am installing them.. Install bladder into cap and make sure it is flat. Screw on cap until it hits the bladder (seal) and give it MAYBE another 1/8 turn to firm it up.
    Welcome to Traxxas.com Yes, EVERYONE here IS a Pro Racer.... [/sarcasm]

  2. #2
    RC Racer
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    Nov 2009
    Location
    Kelowna, BC Canada
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    205
    I don't have big bores, but I crank my caps down as tight as I can without stripping the plastic body...

  3. #3
    RC Champion
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    Sep 2004
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    if I crank em down, the bladder collapses and there goes the seal!
    Welcome to Traxxas.com Yes, EVERYONE here IS a Pro Racer.... [/sarcasm]

  4. #4
    RC Qualifier
    Join Date
    Jan 2010
    Location
    Seattle
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    653
    Quote Originally Posted by Chris.S.
    I don't have big bores, but I crank my caps down as tight as I can without stripping the plastic body...
    dont do that with the big bores!!! the aluminum will be bye bye
    Paul
    Slash 4x4

  5. #5
    RC Enthusiast
    Join Date
    Jan 2010
    Posts
    41
    Your bladders or not seated properly. It is extremely tricky. I have found it is very easy when screwing the cap on for the bladder to get caught up on the threads on the inside of the cap and then get unseated as you tighten it down. As much as I think the bladder is seated properly, if it leaks when I compress the shaft, it isn't.

  6. #6
    RC Enthusiast
    Join Date
    Dec 2009
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    35
    Can you use some teflon tape? Like for plumbing?

  7. #7
    RC Turnbuckle Jr.
    Join Date
    Jan 2008
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    Lugoff, SC
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    3,837
    Quote Originally Posted by bpeltzer
    Can you use some teflon tape? Like for plumbing?
    I would think so. Just make sure you wrap it in the proper direction so it won't rumple up when you turn the cap down.
    RIP Bart Hinson
    1992-2009

  8. #8
    RC Champion
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    Sep 2004
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    Woodhaven, MI
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    2,075
    like stated in my first post. been there done that
    Welcome to Traxxas.com Yes, EVERYONE here IS a Pro Racer.... [/sarcasm]

  9. #9
    Marshal ksb51rl's Avatar
    Join Date
    Nov 2006
    Location
    Northern NJ
    Posts
    20,556
    Big Bores are sensitive to over-tightening. A good snug is all I've ever needed with my few sets.
    You are correct about teflon tape not being a good solution. The threads are not meant to be an oil seal - that's (one of) the bladder's job(s).
    When I have over-tightened a cap, I have then replaced the bladder.

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