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Dealer Torqued U-bolts to 75#

Discussion in '2nd Gen. Tacomas (2005-2015)' started by FL4x4Taco, Jul 29, 2009.

  1. Jul 29, 2009 at 5:35 AM
    #1
    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    Checked last night, that when the dealer did my Leaf TSB, they torqued the Ubolts down to 75#. I kept going up in 5# incriments to see how tight they had them. I know the FSM Spec is 37#, which even I think is crazy low. 50# sounds better... but is 75# to much?? The bolts look large enought to handle the torque.
     
  2. Jul 29, 2009 at 5:42 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Whats the diameter and thread of the bolt?
     
  3. Jul 29, 2009 at 6:01 AM
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    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    Everywhere I look shows the U bolts to be torqued to around 75# to 85#. I think the 37# in the FSM is a Typo, and its meant as 73#.
     
  4. Jul 29, 2009 at 6:27 AM
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    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    That's what I'm saying. But IIRC the TSB even states torquing them to 37#. From the factory the Ubolts were under 40#.... I torqued them to 50# at my 5k oil change.

    Bolt Dia is 1/2" I believe. It takes a 3/4" (19mm) Socket.
     
  5. Jul 29, 2009 at 6:35 AM
    #5
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    A half 1/2-13 SAE grade 8 can handle 110-120 ft/lbs of torque.
     
  6. Jul 29, 2009 at 6:35 AM
    #6
    coma09

    coma09 Senior Member. Hey, what's That supposed to mean?

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    75 ft pounds on a 1/2" bolt isn't lots. Too much torque will stretch (weaken) a fastener. Depends on the material of course. 37 pounds seems low... then again, I'm surprised at the low torques used for some fasteners. Eg bolts for running board brackets were 10 ft lbs. When the wrench clicked, it was way too little torque for me to feel comfortable, so I added a 1/2 turn.
    That they torqued them is great. They didn't just run 'em down with an impact wrench...
     
  7. Jul 29, 2009 at 6:38 AM
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    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    Yeah, 75# seems about right. Even for a grade 5 bolt they say 75-85. So I should be plenty safe. On my previous F250 they were 110#.
     
  8. Jul 29, 2009 at 7:23 AM
    #8
    DDD

    DDD Shine bright like a hymen

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  9. Jul 29, 2009 at 7:47 AM
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    Janster

    Janster Old & Forgetful

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    When I did my Jeep U-bolts, they're TIGHT. Probably closer to 100lbs.

    There are situations (mechanically) where the torque specs are very important.

    In terms of U-bolts.....I'm a firm believer in *tighter is better*
     
  10. Jul 29, 2009 at 8:17 AM
    #10
    brian

    brian Another Traitor

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    Hmmm, now I gotta go out and check mine....
     
  11. Jul 29, 2009 at 10:07 AM
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    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    Tonight I'm going to check/torque the front Leaf bolt, and the two rear (shackle) leaf bolts. IIRC all 3 are at 90#.
     
  12. Jul 29, 2009 at 10:49 AM
    #12
    YotaDan

    YotaDan Dan Vendor

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    Ask any mechanic and he is going to say you are crazy for only tightening a 9/16" u-bolt to 37#. It is critical for u-bolts to be torqued correctly. Torque needs to be 75-100lbft. after installing a block or an add-a-leaf it is important to re-check the torque (especially with new u-bolts) after a couple hundred miles. Whether toyota will admit it or not. The Spec of 37lbft. has to be a typo.
     
  13. Jul 29, 2009 at 11:00 AM
    #13
    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    I'm with you YotaDan. Glad the tech came up with 75# also. That's honestly probably where they need to be. how can lug nuts be at 85, and U-bolts be 37? Over and done with though. thanks for the input guys. I think we should have a sticky for this issue and recomend 75#. Save a lot of folks a lot of hassle. But you still have to wonder, why did the factory only torque them to 37? b/c with only 5k miles They were less than 40#. Oh well.
     
  14. Jul 29, 2009 at 11:53 AM
    #14
    mjp2

    mjp2 Living vicariously though myself Moderator

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    FYI, if your ubolts are not torqued enough you run the risk of breaking the centering pins from the individual leafs moving around. There are a lot of forces at work.

    [​IMG]

    [​IMG]
     
  15. Jul 29, 2009 at 12:09 PM
    #15
    Janster

    Janster Old & Forgetful

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    I've seen this happen multiple times while offroading....it ain't pretty.

    And if you have blocks - I've seen pieces of broken blocks fly out and hit people standing near the trail. The pumpkin twists upward and the driveshaft & u-joints can rip holes on the underside of your body/rig.
     
  16. Jul 29, 2009 at 1:24 PM
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    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    yup. I don't do blocks. I laugh at the "mall crawlwers" riding around in a F350 with 12" blocks. If they only knew how dangerous and stupid they look.
     
  17. Jul 29, 2009 at 2:22 PM
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    Janster

    Janster Old & Forgetful

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    A lot of those trucks have blocks in them from the factory. The 04 Dodge Ram that I owned had about 3" blocks in it from the factory.
     
  18. Jul 29, 2009 at 3:26 PM
    #18
    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    same wtih the F250 and 350. 2" & 3" blocks.
     
  19. Jul 29, 2009 at 6:35 PM
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    TRDKenE

    TRDKenE DAMN GOOD DEAL!!

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    guess Virginia need to update the State Inspection Manual..b/c last I read blocks on the leaf springs would not pass state inspection...
     
  20. Jul 30, 2009 at 4:20 AM
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    FL4x4Taco

    FL4x4Taco [OP] Well-Known Member

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    Along with Maine. No blocks allowed. I'm assuming they mean aftermarket hill billy blocks. 8" block ontop of the factory 2" block.
     
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