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Thread: Exhaust header stud reinstallation issue

  1. #1
    Join Date
    Jul 2016
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    Exhaust header stud reinstallation issue

    Hello Mafia, for those of you who have replaced their exhaust manifolds with catless headers, how did you reinstall the header studs? I've seen many forum posts about how to get them out of the block, but not many posts on reinstalling. I just got my second set of headers in place (first set had bad welds), including new OEM gaskets, nuts, and studs, but am having a difficult time getting the headers bolted to the block.

    My issue is that the header studs do not want to stay in the block while I tighten the nuts. They are backing out as I tighten each bolt. Some of them I can get in about 50% of the way or so and get the nut tightened to spec. I can't reinstall the studs without the headers in place, because the space is so tight I can't slip the headers over them. Double nutting proved ineffective. I might try that again though.

    I'm almost thinking about JB-Welding the nut and stud together in the right place so that the stud can't travel backwards and screw the whole thing in like that. Bad idea?
    2005 Jet Black ZHP Sedan "Adriana" || TunedByDaniel || BMW Alarm + Fuel Lock || ORION V4s || Eagle Eyes || 435i Coupe Sport Seats || Perforated Leather X5 M-Sport Wheel || FLOW Designs Lip

  2. #2
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    Yeah, it's a bitch. I think I put my studs in with loctite and let them sit for 24+ hrs before installing the headers. Either way, I said to hell with the standard studs and used these N54 studs that were recommended in a lot of the header threads. Made install much easier.

    https://www.fcpeuro.com/products/bmw...ud-11127593376

  3. #3
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    Quote Originally Posted by ZHPizza View Post
    Yeah, it's a bitch. I think I put my studs in with loctite and let them sit for 24+ hrs before installing the headers. Either way, I said to hell with the standard studs and used these N54 studs that were recommended in a lot of the header threads. Made install much easier.

    https://www.fcpeuro.com/products/bmw...ud-11127593376
    I saw those but was afraid they weren’t going to fit properly. But if they worked for you, I’m tempted to throw all these troublesome ones out and go for those. Why can’t all the studs look like that?!
    2005 Jet Black ZHP Sedan "Adriana" || TunedByDaniel || BMW Alarm + Fuel Lock || ORION V4s || Eagle Eyes || 435i Coupe Sport Seats || Perforated Leather X5 M-Sport Wheel || FLOW Designs Lip

  4. #4
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    Quote Originally Posted by usinjin View Post
    I saw those but was afraid they werenít going to fit properly. But if they worked for you, Iím tempted to throw all these troublesome ones out and go for those. Why canít all the studs look like that?!
    Worked for me and dozens of others. Definitely use them if you can wait. One of those little updates that were made on the e90 production run to help the line build these things faster.

  5. #5
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    Quote Originally Posted by ZHPizza View Post
    Worked for me and dozens of others. Definitely use them if you can wait. One of those little updates that were made on the e90 production run to help the line build these things faster.
    Done. Seems to be a far better solution than trying to mess with loctite. Thanks for your advice!
    2005 Jet Black ZHP Sedan "Adriana" || TunedByDaniel || BMW Alarm + Fuel Lock || ORION V4s || Eagle Eyes || 435i Coupe Sport Seats || Perforated Leather X5 M-Sport Wheel || FLOW Designs Lip

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