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Ubolts under torqued

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 4WD, Jun 1, 2012.

?

Are your U bolts tight ??

Poll closed Jul 1, 2012.
  1. Tight as they should be

    67.9%
  2. Loose as hell

    32.1%
  1. Jun 1, 2012 at 9:54 PM
    #1
    4WD

    4WD [OP] cRaZy oLdmAn

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    As some of you know I spend a fair amount of time under Tacomas doing leaf springs, & they're mostly 2nd gens that have never had anything done to their springs till I get ahold of them, from '05 up to a couple 2012's. Now heres the problem, literally every one I've done have had U bolts that I swear could not have been tighter than 25-30 ft.lbs as I demonstrated to the last 2nd gen owner who has had nothing done rear spring wise, I took a standard 3/8" drive ratchet w/19mm socket & with 3 fingers on the ratchet gave a slight pull & it was loose on the U bolt spinning free.

    It has become obvious that they are rolling off the assembly line this way in my region of the country, not saying all Tacomas are like this but wherever they build them around my neck of the woods this has been the case. So what I'm asking you to do (if your bored or just want to prove me wrong) is for those with stock leafsprings & you know they've never been messed with, I implore you to throw a socket on yours & try to loosen (or tighten for that matter) posting up your results.

    I mean these are supposed to be around 90 ft lbs. IIRC , even if it was 50 it'd still take a good yank to break loose

    & again, I find it disturbing that they roll off assembly line this way
     
  2. Jun 1, 2012 at 9:59 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    The FSM states that they be torqued to 37 ft.-lbs. I have talked at length about this to some Toyota Tecs., as well as shot a coupl emails to Toyota Corp (though they were un answered). The concensous is they should be torqued between 75# and 85#.
     
  3. Jun 1, 2012 at 10:03 PM
    #3
    dad32509

    dad32509 Thinking of something clever

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    I can honestly say, mine were loose as hell. I went to Dougs to redo my leaf pack and the Ubolts werent even a problem to get off. If they were torqued, it was at 15lbs at the most
     
  4. Jun 1, 2012 at 10:05 PM
    #4
    4WD

    4WD [OP] cRaZy oLdmAn

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    Well then my guess of 25-30 lbs is well, a pretty good guess, but I really have a problem with that , there is NO WAY IN HELL I would let any truck leave my place with U bolts torqued to 37 ft lbs regardless of what the manu. manual says personally
     
  5. Jun 1, 2012 at 10:06 PM
    #5
    04LTtacoma

    04LTtacoma Well-Known Member

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    tight as hell. I got mine torqued to 90ft-lbs
     
  6. Jun 1, 2012 at 10:06 PM
    #6
    4WD

    4WD [OP] cRaZy oLdmAn

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    haha, no shit huh...:D
     
  7. Jun 1, 2012 at 10:09 PM
    #7
    4WD

    4WD [OP] cRaZy oLdmAn

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    As a matter of fact I'd bet that at 37 lbs torque I could pry between the bottom leaf & the perch on axle & see day light, hard to believe Toyota is ok with that...
     
  8. Jun 1, 2012 at 10:22 PM
    #8
    landphil

    landphil Wishin' I was Fishin'

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    When I got my '06 used in 2010 I re-torqued them. I went off the 90 ft lb spec in my old hilux haynes manual as both are 14mm u-bolts, and all moved, a lot. I almost crapped when I later read that the FSM for the taco says 37 ft-lbs, I agree, its not near enough. IMHO, either a typo or a first stage, and they forgot the second and possibly third stages of the torque procedure???
     
  9. Jun 1, 2012 at 10:24 PM
    #9
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    You wouldnt be able to pry them apart. Its still clamping force being applied. That being said, I stand firm in the thinking that under torqued U bolts are one reson behind most rear vibes after a lift install.
     
  10. Jun 1, 2012 at 10:31 PM
    #10
    4WD

    4WD [OP] cRaZy oLdmAn

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    Agreed, I just couldn't let anyone roll out with that little of torque holding something together that is so important & def. would cause additional issues with vibes..
     
  11. Jun 1, 2012 at 10:39 PM
    #11
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    The 37 ft lbs in the FSM has to be a typo
     
  12. Jun 1, 2012 at 10:41 PM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Which is the conclusion I came to. A friend of mine (Who at the time was a Toyota Master tec) confirmed the "37#" should have been 73#'s
     
  13. Jun 1, 2012 at 10:42 PM
    #13
    LAoffroadin

    LAoffroadin BURY ME WITH MY TACO!!

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    all that plus common sense would say that its probably better to ver tighten than under tighten...
     
  14. Jun 1, 2012 at 10:42 PM
    #14
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    Yep

    Unfortunately , because this typo is in the FSM , it also surfaces in Haynes , Chilton , etc
     
  15. Jun 1, 2012 at 10:44 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Being as U bolts are a Torque to Yeild bolt, over tigtening them can have bad consequences.
     
  16. Jun 1, 2012 at 10:45 PM
    #16
    LAoffroadin

    LAoffroadin BURY ME WITH MY TACO!!

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    yes but on this forum the question is "tight as they should be or loose as hell"
     
  17. Jun 1, 2012 at 10:48 PM
    #17
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    that's more of a statement than a question
     
  18. Jun 1, 2012 at 10:50 PM
    #18
    LAoffroadin

    LAoffroadin BURY ME WITH MY TACO!!

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    :facepalm::facepalm::facepalm: you get the point...
     
  19. Jun 1, 2012 at 10:50 PM
    #19
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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    actually kinda maybe no
     
  20. Jun 1, 2012 at 10:51 PM
    #20
    4WD

    4WD [OP] cRaZy oLdmAn

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    Yep, they'll thread stretch just fine on their own



    true, now the whole damned thing is subject for debate as to whats "tight as it should be" or "loose as hell"

    For what its worth if I can , with 3 fingers & no effort spin these nuts loose (as the way its been) This falls into the "Loose as hell" area IMO..
     
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