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Check Your U-Bolts

Discussion in '3rd Gen. Tacomas (2016-2023)' started by splitbolt, Oct 26, 2015.

Page 5 of 21
  1. Oct 28, 2015 at 9:39 AM
    #81
    Rattletrap66

    #81
    Rattletrap66 (ノಠ益ಠ)ノ彡┻━┻

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    I do
     
    Rattletrap66, Oct 28, 2015
    #81
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  2. Oct 28, 2015 at 9:44 AM
    #82
    Large

    #82
    Large Red

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    I do as well but I also calibrate mine periodically.
     
    Large, Oct 28, 2015
    #82
    tonered likes this.
  3. Oct 28, 2015 at 10:06 AM
    #83
    splitbolt

    #83
    splitbolt [OP] Voodoo Witch Doctor

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    My reckoning says it either 4T or 6T...
     
    splitbolt, Oct 28, 2015
    #83
  4. Oct 28, 2015 at 10:39 AM
    #84
    Jeff Lange

    #84
    Jeff Lange Well-Known Member

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    As the U-Bolts do not have a bolt head, there are no markings for bolt strength to check.

    The nuts are 12N, but that doesn't actually tell you much about the bolts.

    The lowest class of M14 bolt Toyota lists is 4T which would be 61 ft-lbs. I doubt they're lower than 5T though (76 ft-lbs).

    Jeff
     
    Jeff Lange, Oct 28, 2015
    #84
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  5. Oct 28, 2015 at 10:52 AM
    #85
    splitbolt

    #85
    splitbolt [OP] Voodoo Witch Doctor

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    Sure it's not a 6T?
    Where have we seen that spec before?
    Point is, Toyota's all over the place...
    ss1_zpsejrbxv8n_08247a805a900a98d3587692354eef81147799bd.jpg
    ss2_zps3ckmmlex_17232fe12a1043d7152939d20bbdb7661d6a91d7.jpg
     
    splitbolt, Oct 28, 2015
    #85
  6. Oct 28, 2015 at 10:56 AM
    #86
    Jeff Lange

    #86
    Jeff Lange Well-Known Member

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    It could of course be a 4T, 5T, 6T, or even a 7T.

    There are no markings on the bolts, so there's no way to tell just by looking at them. The nuts have markings (12N), the bolts do not have any markings as they are threaded on both ends with no head.

    Jeff
     
    Jeff Lange, Oct 28, 2015
    #86
  7. Oct 28, 2015 at 11:34 AM
    #87
    splitbolt

    #87
    splitbolt [OP] Voodoo Witch Doctor

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    There are only two categories for a 14mm stud/nut; 4T and 6T.
    Where does 52ft/lbs come from?
     
    splitbolt, Oct 28, 2015
    #87
  8. Oct 28, 2015 at 11:47 AM
    #88
    Jeff Lange

    #88
    Jeff Lange Well-Known Member

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    The chart you just posted lists 14mm for 4T, 5T, 6T and 7T, though it is an old chart and they have a newer one for the updated marking including H ratings for nuts (T ratings are for bolts only).

    That said, these charts are standard torque values of the hardware and are to be used when there is no specific torque value listed for the application. It does not mean that every 6T M14 bolt gets torqued to 90 ft-lbs.

    The 52 ft-lbs comes from the rear suspension torque chart, rear suspension component diagram and repair instructions for the rear suspension leaf springs.

    In conclusion:

    - The chart posted is old and doesn't really apply to new Toyotas any more.
    - There are 2 torque specifications: the hardware and the application. The maximum torque spec for the hardware does not mean that's what every application that uses that hardware will be torqued to that value.
    - The nuts are rated as "12H" using the newer Toyota grade rating system.
    - The u-bolts have no markings on them and we can't know what grade bolt they are just by looking at them.
    - The 14mm torque rating for 4T is 61 ft-lbs, for 5T is 76 ft-lbs, for 6T is 90 ft-lbs, for 7T is 123 ft-lbs.
    - Toyota's torque spec for the u-bolts on the 2015 is 37 ft-lbs and on the 2016 is 52 ft-lbs.

    Jeff
     
    Jeff Lange, Oct 28, 2015
    #88
    Tharris242, HalfWayThere and DoorDing like this.
  9. Oct 28, 2015 at 12:25 PM
    #89
    splitbolt

    #89
    splitbolt [OP] Voodoo Witch Doctor

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    The U-bolt part number changes from '04 into '05; does the part number change from '15 into '16?

    Is there a way of finding out T-rating for each gen?
    1st gen would have required at least 6T; 2nd/3rd gen, 4T...

    Or, where does grade 5 fall in the T-scale?
     
    splitbolt, Oct 28, 2015
    #89
  10. Oct 28, 2015 at 12:32 PM
    #90
    Jeff Lange

    #90
    Jeff Lange Well-Known Member

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    Yeah, the 1st gen would have had to at least been 6T.

    The only way to find out the T-rating for the 2005+ u-bolts would be to ask someone at Toyota, it's not listed anywhere and there are no markings on the bolts either.

    Jeff
     
    Jeff Lange, Oct 28, 2015
    #90
  11. Oct 28, 2015 at 9:30 PM
    #91
    LuvTacos

    #91
    LuvTacos Well-Known Member

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    Not good, this is safety issue. Mexican build?
     
    LuvTacos, Oct 28, 2015
    #91
  12. Oct 28, 2015 at 9:47 PM
    #92
    splitbolt

    #92
    splitbolt [OP] Voodoo Witch Doctor

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    Si.
    Doesn't matter; apparently, it's by design.
    Toyota has a solid reputation with leaf springs.
    What's the worst that could happen?
     
    splitbolt, Oct 28, 2015
    #92
  13. Oct 28, 2015 at 9:49 PM
    #93
    LuvTacos

    #93
    LuvTacos Well-Known Member

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    The bolts come off, you veer to the left and crash into a fuel tanker!
     
    LuvTacos, Oct 28, 2015
    #93
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  14. Oct 28, 2015 at 10:01 PM
    #94
    splitbolt

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    splitbolt [OP] Voodoo Witch Doctor

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    Nah...maybe just year after year of fatigued and broken springs.
    Don't worry though, Toyota wouldn't never let that happen.
     
    splitbolt, Oct 28, 2015
    #94
  15. Oct 29, 2015 at 6:52 PM
    #95
    UberDingu

    #95
    UberDingu Well-Known Member

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    I checked mine today while fluid filming, 6 if the 8 were at least 52 ft lbs, 1 was just shy and 1 was much lower. Thanks for the heads up. On a side note... I fucking love this truck
     
    UberDingu, Oct 29, 2015
    #95
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  16. Nov 5, 2015 at 4:04 PM
    #96
    Frank_Zuccarini

    #96
    Frank_Zuccarini Obscure Member

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    Checked my truck, with only 17 miles on the odometer.

    7 of 8 bolts were 52 ft-lbs or higher. One bolt was something less than 52 ft-lbs.

    I have a TRD OR AC built in Texas.

    Frank
     
    Frank_Zuccarini, Nov 5, 2015
    #96
  17. Nov 5, 2015 at 4:09 PM
    #97
    Benson X

    #97
    Benson X My build thread sucks...

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    If you don't draw blood, you're doing it wrong!
    Also, this is from OME:


    OMEU53A Specifications (all dimensions in mm)

    A: 185 B: 75 C: 14 D: 65 Thread: 1.5 E: SQUARE Recommended Torque: 93 lb. ft or 126 Nm



    [​IMG]
     
    Benson X, Nov 5, 2015
    #97
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  18. Nov 5, 2015 at 4:35 PM
    #98
    CusterFan

    #98
    CusterFan Well-Known Member

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    Not to change the subject but I looked under the the black SR5 I'm buying at the dealership today and there is about 3 to 4 inches of black chain hanging down through the hole of the spare tire. Is this normal? I think when I pick it up Monday I am going to put a plastic wire tire on it to keep it from hanging down. (Tie it to the spare)
     
    CusterFan, Nov 5, 2015
    #98
  19. Nov 5, 2015 at 4:49 PM
    #99
    Markc1024

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    Markc1024 Well-Known Member

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    It's the chain used to lower/raise the tire. The slack just hangs loose while the tire is up, but then is taken up as the tire is lowered. Being my first Tacoma, I made sure I dropped the tire once before needing to.
     
    Markc1024, Nov 5, 2015
    #99
    tonered likes this.
  20. Nov 5, 2015 at 4:51 PM
    #100
    Markc1024

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    Markc1024 Well-Known Member

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    I measured my u-bolts - came right in at 13mm or .51" depending upon how the micrometer is set.
     
    Markc1024, Nov 5, 2015
    #100
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