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Thread: Cracked exhaust manifold

  1. #1
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    Cracked exhaust manifold

    It seems I have a cracked exhust manifold, drivers side. I can't get the heat shield off because the small bolts have been replaced by self tapping screws that are seized and "ungettable", so I'm thinking of cutting it off or some such buchery.
    Anyone been there done that. I understand that I should be able to get it MIG welded.

    Also, how do I search this forum? I cant get the search to look up more that one word. When I enter exhaust manifold I get all instances of exhaust and all of manifold, NOT exhaust manifold.

  2. #2
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    Quote Originally Posted by ytt105 View Post
    It seems I have a cracked exhust manifold, drivers side. I can't get the heat shield off because the small bolts have been replaced by self tapping screws that are seized and "ungettable", so I'm thinking of cutting it off or some such buchery.
    Anyone been there done that. I understand that I should be able to get it MIG welded.
    It depends where it's cracked as to whether it's weldable. You'll probably find the little flex section is cracked so you might need to find someone who can replace that.
    As the flex section joins the 2 halves, they might need a cylinder head as a jig to make sure the new flex joint fits OK.
    Scott

  3. #3
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    Something else to think about. You may also need to have manifold planed to make sure its flat

    Gary

  4. #4
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    I had a similar problem with the heat shield being stuck on mine due to a seized bolt, and I did end up cutting it... poorly.

    Now I have a Dremel and am itching for an excuse to use it in anger. Come around on the weekend and we can have a play... my Dremel, your heat shield/screws

    Cheers, Paul.
    My toys, projects and write-ups at PaulP38a.com

  5. #5
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  6. #6
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    Quote Originally Posted by PaulP38a View Post
    I had a similar problem with the heat shield being stuck on mine due to a seized bolt, and I did end up cutting it... poorly.

    Now I have a Dremel and am itching for an excuse to use it in anger. Come around on the weekend and we can have a play... my Dremel, your heat shield/screws

    Cheers, Paul.
    Hi Paul,

    Did you replace the heat shield with a new one? I do have one rattling since it looses a bolt

  7. #7
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    Quote Originally Posted by Marshall View Post
    They all seem to crack sooner or later so I don't think I'd risk a 2nd hand one, especially at that price.

    I wonder if anyone's gone to the trouble of having regular steel extractors made up?
    Scott

  8. #8
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    Thanks Paul

    I might take you up on that offer.

    I'll give you a call later in the week

    Regards
    Trev

  9. #9
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    Quote Originally Posted by 996TURBO View Post
    Hi Paul,

    Did you replace the heat shield with a new one? I do have one rattling since it looses a bolt
    nope, went from this


    to this


    If it rattles, I can't hear it.

    Cheers, Paul.
    My toys, projects and write-ups at PaulP38a.com

  10. #10
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    petrol p38's have to have heat sheilding of some sort on the manifolds. if they don't have it any close wiring gets fried, the inlet ducting melts and under bonnet temps get even higher. the silver ceramic heat coating seems to work well.

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