Thread: Downpipe bolts not sealing downpipe to manifold

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  1. #1 Downpipe bolts not sealing downpipe to manifold 
    GT Level Member chicagochuck's Avatar
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    I i had to disconnect my downpipe from the manifold but now I cannot get it to seal completely. I tightened the 13mm nuts as much as I think I can,(didn't want to break them), but its still leaking.

    Is it mandatory to change the whole bolt and nut to get it sealed properly? And the bolts are welded into the flange so would need to be drilled out from up top?

    Thinking to take to a shop tomm so wanted to know if this was feasible to do myself or not.
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  2. #2 Re: Downpipe bolts not sealing downpipe to manifold 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Is the gasket still there?

    SMGPFC Member #1
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  3. #3 Re: Downpipe bolts not sealing downpipe to manifold 
    GT Level Member chicagochuck's Avatar
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    Its a zzp downpipe, if that matters. But Yes I changed it with a new walker gasket just to make sure it wasn't the old thin tin gasket.
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  4. #4 Re: Downpipe bolts not sealing downpipe to manifold 
    I live here. stealthee's Avatar
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    Did you put the gasket in right?


    2011 Mitsubishi Lancer GTS - DD mode
    1991 Mitsubishi 3000GT - Many mods to come
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  5. #5 Re: Downpipe bolts not sealing downpipe to manifold 
    GT Level Member chicagochuck's Avatar
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    I thought about that but Both sides look pretty much the exact same. and it did the same thing with the other flat thin gasket as well

    Maybe I can get a few more turns out of the nuts if they are heated...
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  6. #6 Re: Downpipe bolts not sealing downpipe to manifold 
    I live here. stealthee's Avatar
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    They shouldn't need to be heated. I had zero issues removing and reinstalling my ZZP dp several times over a few day period.


    2011 Mitsubishi Lancer GTS - DD mode
    1991 Mitsubishi 3000GT - Many mods to come
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  7. #7 Re: Downpipe bolts not sealing downpipe to manifold 
    GT Level Member chicagochuck's Avatar
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    hmmmm interesting
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  8. #8 Re: Downpipe bolts not sealing downpipe to manifold 
    GrandPrix Junkie HighOctaneRacing's Avatar
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    I bet the bolts need to be tightened more.
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  9. #9 Re: Downpipe bolts not sealing downpipe to manifold 
    GT Level Member chicagochuck's Avatar
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    I tightened up the bolts and that may have done the trick. its still loud as **** but it looks like it pretty much needs a weld after the cat. The flex pipe looks bad as well.
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