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  1. #1

    Default Rusty pipe flange. Need to separate

    I'm trying to redo the pipe on my exhaust for my truck. In order to take only the section off I need welded, there's a flange right after the catalytic converter that I should be able to unbolt. Only problem is it is so rusted that I can't get it to come apart. Any ideas?

  2. #2
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    498

    Default

    Pb blaster or wd40 and let it sit? How fast does it need to come off? Can you heat up some part of it to break it loose?
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  3. #3
    Join Date
    Jul 2011
    Location
    N. Mississippi
    Posts
    8

    Default

    BFH---works every time.

  4. #4
    Join Date
    Jul 2010
    Posts
    377

    Default

    Heat wrench...BFH...hacksaw...O/A torch

  5. #5
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,853

    Default

    If your just talking about the bolts then get new ones & cut off the old ones. If you have already done that & the flanges still won't seperate then you can try heating them with a torch & hitting with a hammer. Also maybe there is a spot you can get a chisel started between the flanges to force them apart.
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  6. #6

    Default

    Ok. I think I'm gonna try the chisel since I cut the bolts and it's still attached. I don't really have access to a hot enough torch so thats out the window.

  7. #7
    Join Date
    Dec 2006
    Location
    Clarksville, TN
    Posts
    427

    Default

    If inner pipe is trash denting it inwards will help breaking the rust. Heat from a propane torch would be a big help. Either way wd-40 and tapping it with a hammer will help too. If you spray it before heating it watch you eyebrows.

  8. #8
    Join Date
    Nov 2006
    Location
    Hampton, Va.
    Posts
    386

    Default

    Kroil

  9. #9
    Join Date
    Jan 2012
    Location
    Metro Detroit, MI
    Posts
    182

    Default Get tools

    Invest in some Kroil Oil and O&A torch. Do you have an air hammer? cut off a bit or buy a hammer bit and vibrate it off
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  10. #10
    Join Date
    Aug 2008
    Posts
    113

    Default

    I do lot of custom exhaust work please post what year model motor and ect ect ect i can tell you a easy way to fix it u might not need to worrie about the flange behind the cat post it up and will advise

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