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Bolts that require re-torquing: why not just thread lock?

Discussion in 'Technical Chat' started by Cannikin, May 21, 2020.

  1. May 21, 2020 at 8:52 PM
    #1
    Cannikin

    Cannikin [OP] Well-Known Member Vendor

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    I’m putting a u-bolt flip kit on my 2nd gen. The instructions say that the bolts require re-torquing after 50 and 500 miles. Is there a reason I can’t just put some threadlocker on them (blue or red) and skip the re-torquing?
     
  2. May 21, 2020 at 8:53 PM
    #2
    Jason TRD OR

    Jason TRD OR Alpha Mega-Known Member

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    The new u bolts can “stretch” therefore come loose slightly even tho the bolt doesn’t turn. Slightest amount usually they just say retorque as a precaution. I’ve done many lifts and trucks that come back for a retorque never have loose bolts.
     
  3. May 21, 2020 at 8:55 PM
    #3
    JasonLee

    JasonLee Hello? I'm a truck.

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    Better safe than sorry.
     
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  4. May 21, 2020 at 9:03 PM
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    T4RFTMFW

    T4RFTMFW Well-Known Member

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    There was a third gen who lost his rear axle because he didn’t re-torque. Some instructions exist for a reason.
     
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  5. May 21, 2020 at 9:11 PM
    #5
    tsab916

    tsab916 Well-Known Member

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    Yes. U-bolts will stretch. I've gone on trips through the Fordyce trail with my bro-in-law and watch him torque his u-bolts before the trip and after and he does get the slightest turn when off the trail.
     
    Jason TRD OR likes this.
  6. May 21, 2020 at 9:19 PM
    #6
    CaptainBart45

    CaptainBart45 Well-Known Member

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  7. May 21, 2020 at 9:20 PM
    #7
    TnShooter

    TnShooter Well-Known Member

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    A lot a times it is recommended to recheck lug nut torque after so many miles.
    It usually depends on the wheel type and or manufacturer.
    I know when we bought our new utility trailer, it was required that you check the torque every 50 miles for the first 150. Then each 500 miles after. Yes, the first time we checked the lugs did turn slightly before the torque wrench “clicked”.

    I guess my point is, I’m not sure I’d want to run loctite on my lug nuts?
    That would not be too fun, while changing a flat on the side of the road.
     
  8. May 21, 2020 at 9:24 PM
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    Bishop84

    Bishop84 Well-Known Member

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    I've never had to retorque a ubolt but its a good idea.

    The big ones for me are the control arm bolts. Both upper and lower after major work I'll bring back in after alignment test drive and reef on them one more time.
     
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  9. May 21, 2020 at 9:32 PM
    #9
    tsab916

    tsab916 Well-Known Member

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    Ha, if your referring to me, I never mention I know how to do it better, I'm only explaining what I've seen and experience.
     
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  10. May 22, 2020 at 1:30 AM
    #10
    Wyoming09

    Wyoming09 Well-Known Member

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    I am sure he meant me!!
     
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  11. May 22, 2020 at 1:32 AM
    #11
    Wyoming09

    Wyoming09 Well-Known Member

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    This more then any other reason
     
  12. May 22, 2020 at 4:20 AM
    #12
    Blue92

    Blue92 Well-Known Member

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    I got a partial turn out of some of the u bolt nuts on both my dads 08 and my 04. Maybe 1000 miles after initial install. Would they have come apart? I doubt it, but Im glad I checked.
     
  13. May 22, 2020 at 7:10 PM
    #13
    Cannikin

    Cannikin [OP] Well-Known Member Vendor

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    Thanks for the replies! I didn't think about the u-bolts stretching! I thought the worry was the bolts would loosen themselves from vibration so I figured you could loctite those and problem solved! But if the bolts themselves get longer, that's a different story!
     
  14. May 22, 2020 at 7:44 PM
    #14
    CaptainBart45

    CaptainBart45 Well-Known Member

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    U-bolts holding leaf springs together. You don't want to thread lock and be done with it. Let it find it's happy home and toqe it down. I was just joking about with the "always a guy knows best" crap. I am usually that guy...
     
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  15. May 25, 2020 at 12:46 AM
    #15
    ROAD DOG

    ROAD DOG Well-Known Member

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    i will refer U 1st to ' ARP " for Ur edification

    they KNOW bolts .....fasteners ....... studs ETC!!!!!!!!

    years ago they published a table of a common bolt
    stud
    fastener
    from rods ..... heads etc

    Same size........SAME torque........SAME torque wrench
    using ALL fo the usual culprits in a typical garage

    WD40.......engine oil diff weights.......3n 1 oil.......polishing the threads
    several types o thread lockers
    ******* i have not been able to find that table
    After the designed their product & offered it.......... they may have deleted it

    some reduced the actual torque values dramatically
    subsequently ARP developed they own dedicated product

    essentially which was MORE consistent & gave reading closer to the desired values

    many MARQUES & racing teams assemble more DRY than most know
    When i say DRY there is a distinct abscence of chemicals / spray/ etc

    ive taken many an engine & vehicle apart & found NO evidence of thread lockers
    NO way U get the same torque !!!!!!!!!!!

    vibration & stretch are NOT the only or major concerns
    if the initial construct is OFF a direct result of lubricants .............questionable tools
    later after breakdown ...... teardown
    whichwver come 1st

    can lead 1 to believe a component failure when assembly was a factor
     
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  16. May 25, 2020 at 12:47 PM
    #16
    gotoman1969

    gotoman1969 Well-Known Member

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    If thread locker is not called for then don’t use it, thread locker actually changes the torque spec.
     
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