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Thread: Subframe bolt question

  1. #1
    Yaemish is offline Cadillac Owners Connoisseur
    Automobile(s): 02 Seville, 04 SRX
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    Subframe bolt question

    The cradle/sub-frame bolt in position 2 (this is the one in the middle that has a nut accessible inside each wheel well) has been giving me headaches for some time. The one on the passenger side seems to loosen so that when it gets wet it will make a popping sound.

    When I unscrew the new bolt (i replaced it last year) some of the threads of been worn down already. I'm going to get a new bolt but I was wondering if that nut should be welded in there? I am able to remove the nut one I take the bolt out. I wonder if it it shifting around because it is supposed to be secure to the body.


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Subframe bolt question

    None of these seem to be welded. Maybe use some high strength thread locker.


  4. #3
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
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    Re: Subframe bolt question

    They are captive nuts with a cage around them to prevent them from spinning. They should not be welded. If the assembly loosens after some time, remove the bushings (#4 & 5), washer (#6), and spacer (#3). Be sure the spacer hasn't rotted under the bushing and is collapsing when torquing down the bolt. Not an uncommon occurrence.

  5. #4
    Yaemish is offline Cadillac Owners Connoisseur
    Automobile(s): 02 Seville, 04 SRX
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    Re: Subframe bolt question

    I think the cage around the nut is no longer tight. I am able to easily remove the nut when the bolt is out. All the hardware was replaced last summer. I actually found a TSB about the issue in the Bonneville forums. It included the Seville and they fix involved putting some epoxy on the insulator. It didn't work. I'll try with a new nut, bolt, and some threadlocker.


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