1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

The Torque Spec. Guide

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Benson X, Mar 1, 2014.

  1. Apr 27, 2016 at 6:14 PM
    #181
    jqueener

    jqueener Well-Known Member

    Joined:
    May 5, 2013
    Member:
    #103540
    Messages:
    3,404
    Gender:
    Male
    First Name:
    Jason
    Sacramento, CA
    Vehicle:
    2006 dcsb 4x4 trd sport
    LR UCA's Kings ext rmlt resi 700lb springs. Rear ARB locker all pro expos u-bolt flip Armor BAMF sliders with kick out All pro apex front all pro ifs skid Pelfreybilt Off-Road mid and transfer skids all pro hi clear rear bumper Wheels 285/70/17 dura tracs on MB TKO matt black 17x 8.5" gears 4.56 OBA viair 450c with 2.5 tank. engo 10k winch
    By u joints do you mean the bolts that hold the driveline to the pinion flange? I just swapped my diffs so im curious. U jionts themselves dont have anything to tighten as far as i know.
     
  2. Apr 27, 2016 at 9:42 PM
    #182
    pdederko

    pdederko Member

    Joined:
    Mar 17, 2016
    Member:
    #181537
    Messages:
    9
    Gender:
    Male
    First Name:
    Peter
    Vehicle:
    2015 Tacoma PreRunner SR5 Access Cab
    Rear U bolts that hold suspension links to the axle.
     
  3. Apr 28, 2016 at 8:21 AM
    #183
    jqueener

    jqueener Well-Known Member

    Joined:
    May 5, 2013
    Member:
    #103540
    Messages:
    3,404
    Gender:
    Male
    First Name:
    Jason
    Sacramento, CA
    Vehicle:
    2006 dcsb 4x4 trd sport
    LR UCA's Kings ext rmlt resi 700lb springs. Rear ARB locker all pro expos u-bolt flip Armor BAMF sliders with kick out All pro apex front all pro ifs skid Pelfreybilt Off-Road mid and transfer skids all pro hi clear rear bumper Wheels 285/70/17 dura tracs on MB TKO matt black 17x 8.5" gears 4.56 OBA viair 450c with 2.5 tank. engo 10k winch
    Oh, u bolts , not u jionts. And i think you mean leaf springs not suspension links. Terminology is key as thise are completely different things.
     
  4. Apr 28, 2016 at 8:38 AM
    #184
    pdederko

    pdederko Member

    Joined:
    Mar 17, 2016
    Member:
    #181537
    Messages:
    9
    Gender:
    Male
    First Name:
    Peter
    Vehicle:
    2015 Tacoma PreRunner SR5 Access Cab
    Yes, you're correct. The U bolts holding down the axle to the leaf springs. Thanks for clarifying.
     
  5. Jun 21, 2016 at 6:04 AM
    #185
    pa blaster

    pa blaster Well-Known Member

    Joined:
    Jan 27, 2012
    Member:
    #71544
    Messages:
    1,610
    Gender:
    Male
    First Name:
    Scott
    central pa
    Vehicle:
    2015 DCSB TRD OR 4x4
    5100's front & rear , Eibach springs, LR uca,Icon progressive aal
  6. Jul 2, 2016 at 6:33 AM
    #186
    Spencer

    Spencer Future President

    Joined:
    Dec 19, 2012
    Member:
    #93415
    Messages:
    1,448
    Gender:
    Male
    First Name:
    TIGGLEBITTIES
    Upland, Chino... all of 909.
    Vehicle:
    2013 DCSB 4X4 6cyl Sex Machine
    Redline hood lift, Flyzeye cabin lights, tailgate lock, SPOD Power block, VIAR onboard air, Cobra CB radio, Firestick 4' Antenna, Hot Blonde CoPilot Mod, SIX 9" Hella 4000 HID conversion with external 55W ballasts, Six 6" LED bars, Napier Bed Tent, Mudflaps delete using rocks, Roof rack by Brute force, Rock sliders by Brute force, Bed LED lights, Underhood LED automatic lights, Constant 12V bed plug, Rugged race radio, ICON uniball UCA's, KING 2.5 700 rate coilovers, Deaver rear leaf springs, KING 2.5 resi rear shocks (Flat 0.15 stack on compression shims), Scangauge, Empty wallet Mod Bug disease, AllPro Apex front bumper, On board heat exchange shower & water pump (Heater Core intercept mod), On Board Air - Viair for now, ARB when it dies-, allpro Skids back to gas tank- Tepui RTT on the shittiest "Bed Rack" ever made.... AllPro U Bolt flip kit with timbren bumps NEXT UP- expo leafs & bed rack, hydraulic bumps in rear, Total Chaos stock LCA's w/ Bypass, Rear 12" shock hoop relocate
    goblue82 likes this.
  7. Jul 12, 2016 at 7:21 PM
    #187
    Benson X

    Benson X [OP] ...and we're back!

    Joined:
    Nov 13, 2010
    Member:
    #46123
    Messages:
    5,234
    Gender:
    Male
    First Name:
    Ben
    Olympia, WA
    Vehicle:
    '11 MGM DC/LB
    If you don't draw blood, you're doing it wrong!
    As pointed out by @Chickenmunga, there were no diagram(s) or detailed torque specs for the Power Steering components. I updated the OP to include the Power Steering Diagrams for 2WD and 4WD - thanks for the heads-up Mike!
    :cheers:

    Also, @tcBob must've increased the attachment size limit on the (new) forum - so I was able to add the updated .PDF file here and at the bottom of the OP!!! Rejoice!!!
    :yay:
     

    Attached Files:

    Crom and tcBob like this.
  8. Jul 12, 2016 at 8:15 PM
    #188
    Chickenmunga

    Chickenmunga Nuggety

    Joined:
    Apr 10, 2008
    Member:
    #5877
    Messages:
    7,108
    Gender:
    Male
    First Name:
    Mike
    Hillsboro, Oregon
    Vehicle:
    08 TRD Offroad DC 4x4 (read the build)
    oh nice, those are better pictures than the ones I had found
     
  9. Jul 12, 2016 at 8:31 PM
    #189
    BudMan

    BudMan Well-Known Member

    Joined:
    Jan 30, 2013
    Member:
    #96465
    Messages:
    3,296
    Gender:
    Male
    First Name:
    Bret
    Alameda, CA, (Bay Area)
    Vehicle:
    06 TRD Sport DC 4x4
    Demello 3 Hoop, ARB rear locker & compressor, OME 887s and Dakars, Camburg uniball UCA, Duratrac 285s, FJ Wheels rattlecan black, EBC Stage 5 brakes, custom satoshi by me, BAMF kickout sliders and LCA skids, custom drilled roof rack, wet okoles, weathertechs, BAMF 1/4" IFS and Trans skid, East Oakland welded exhaust crossover, brute force hi clearance rear , 4.88 gears
    @Mademan925 i should have bet you at the staircase. 83 for the wheels :p
     
  10. Jul 12, 2016 at 9:00 PM
    #190
    Mademan925

    Mademan925 Senor Taco

    Joined:
    Nov 7, 2012
    Member:
    #90668
    Messages:
    6,901
    Gender:
    Male
    First Name:
    Nick
    Discovery Bay, CA
    Vehicle:
    2014 4x4 TRD OFFROAD DCSB
    enough to go over stuff
    Well mine are at 85. :benchpress:
     
    BudMan likes this.
  11. Sep 12, 2016 at 7:18 PM
    #191
    mpkramer71

    mpkramer71 KRAMERICA'1

    Joined:
    Mar 22, 2015
    Member:
    #151504
    Messages:
    882
    Gender:
    Male
    First Name:
    Mike
    Murfreesboro, Tn
    Vehicle:
    '12 Tacoma DC TRD-OR
    ICON 2.5 Coils, Dakar LP W/Sumo springs & FOX 2.0, CBI MOAB 2.0 w/Smittybilt X2O winch, CBI Rock Sliders, Mobtown Aluminum Skids & Bed Bars, FabFour rear bumper, BFG KO2's 4 Steet & KM2's 4 O-R, + some Iggy lighting
    Thank you!!!
     
  12. Sep 14, 2016 at 4:02 PM
    #192
    AP-Tanner

    AP-Tanner Well-Known Member

    Joined:
    Aug 9, 2016
    Member:
    #194173
    Messages:
    64
    Gender:
    Male
    First Name:
    Tanner
    Hamilton, MT
    Vehicle:
    2007 Toyota FJ Cruiser
    AP front/rear bumper, AP Sliders, AP IFS Skid, 3" Lift, 34/10.5/17 BFG AT KO2, BMC, Blacked out
    I'm going to preface this by saying I haven't read all 10 pages, so it may have been covered in here already. Torque specs are set based on the type of bolt and specs are standard across applications. While its nice that you have all the diagrams and bolts and specs called out for us, all you really need to get proper torque specs is a chart such as this:

    https://www.imperialsupplies.com/pdf/a_fastenertorquecharts.pdf

    I know on page two there's some talk about a 73 being transposed as 37 and people are questioning which is right. Easy way to check is to look at what kind of bolt it is, look at thread, pitch, and grade, then compare it to the chart above. Just as an example, I believe the U-bolt is a 14mm dia, I'm not sure what the thread pitch is either so I'm going to assume for demonstration purposes that its an M14x2 and I'm guessing grade is 8.8. Looking this up on the chart, I can see torque spec is supposed to be 93.75 ft-lbs.
     
    mpkramer71 and Crom like this.
  13. Sep 15, 2016 at 5:33 AM
    #193
    TacoRD16

    TacoRD16 Well-Known Member

    Joined:
    Apr 7, 2016
    Member:
    #183536
    Messages:
    408
    Gender:
    Male
    First Name:
    Chris
    Houston, TX
    Vehicle:
    2016 Tacoma TRD Off Road 4x4
    Fox 2.5 RR C/O Fox 2.0 RR Rear Dakar leaf Pack Headstong Brakeline Extension Bracket 16"Konig Countersteer wheels BFG's KO2 285/75r16 All-Pro UCA 1.25" All-Pro APEX Slidders Unided CB w/ Firestick II Lamin-X fog Lens 1" Diff Drop OME 1/2" CB Drip OME Mobtown 3/16" Skid plates: Front, Trans and Transfer case Relentless Hood Brackets AuxBeam Ditch Lights DBCustons Grill "Recolored" Matt Black Relentless High Lift Mount Softopper Diff Breather Mod Tail Gate Inserts HondoGarage Tablet Vent Mount Weather Tech Floor Liner
    As a pressure vessel engineer I would NOT use that chart as blanket for all torque applications. Torque values are a very touchy subject even in the oil and gas industry because there are a lot things to take into consideration when torquing a bolt. That is just for static equipment besides cyclic wind loads but these are vehicles that see all types of vibrations at different frequencies. The spec you are quoting does not take into consideration the application of the members you are bolting together and preload. You just stated the U-bolts should be (with assumptions of material) ~93 ft-lbs when the diagrams calls roughly 73 ft-lbs. Did that 93 ft-lbs take into consideration of the 4 bolts properly aligned on the seat? The force of the bolt from the U bend of the U-bolts and/or formed from either cold or hot work? Did it take into consideration of the axle housing bearing the clamping stress? Maybe a different material is used from what you assumed and the factory wanted a preload on the U-bolt which is why they tend to yield.Thats why people say to never reuse U-bolts. A preload of 20% of the yield is usually lost the sec you pull the wrench off the bolt through the bolt, nut and bolted members. People lives are at stake driving there vehicles so if I were you I would leave the torque values up to the manufacture.

    Not trying to scare you but I hear way to many scary lawsuits in this industry being on the design side of it all.
     
    Last edited: Sep 15, 2016
    mpkramer71 likes this.
  14. Sep 15, 2016 at 7:39 AM
    #194
    mpkramer71

    mpkramer71 KRAMERICA'1

    Joined:
    Mar 22, 2015
    Member:
    #151504
    Messages:
    882
    Gender:
    Male
    First Name:
    Mike
    Murfreesboro, Tn
    Vehicle:
    '12 Tacoma DC TRD-OR
    ICON 2.5 Coils, Dakar LP W/Sumo springs & FOX 2.0, CBI MOAB 2.0 w/Smittybilt X2O winch, CBI Rock Sliders, Mobtown Aluminum Skids & Bed Bars, FabFour rear bumper, BFG KO2's 4 Steet & KM2's 4 O-R, + some Iggy lighting
    Pretty reasonable advice, follow the manufactures specs whenever available. If you don't have them, use the general spec sheet to for a bench mark so you don't over due it. Lord knows I've over torqued more than one bolt in my days with a wrench...
     
  15. Sep 15, 2016 at 8:56 AM
    #195
    AP-Tanner

    AP-Tanner Well-Known Member

    Joined:
    Aug 9, 2016
    Member:
    #194173
    Messages:
    64
    Gender:
    Male
    First Name:
    Tanner
    Hamilton, MT
    Vehicle:
    2007 Toyota FJ Cruiser
    AP front/rear bumper, AP Sliders, AP IFS Skid, 3" Lift, 34/10.5/17 BFG AT KO2, BMC, Blacked out
    I hear you, I was saying just as a general reference for when there are discrepancies in the guide like people discussed on page 2. I'm a mechanical engineer so I understand your dynamic loading scenario and I agree with you to some extent. Just wanted to post some more information for people as you can never have too much information. Like in every situation, there's caveats that can make things like that chart invalid. However, from an automotive perspective, if you can torque the bolt to a spec listed between the max and min values, 99% of the time you're going to be just fine.

    EDIT: Doing a little more research, at All-Pro we use a 9/16" U-bolt with our flip kits. In that chart, it says Grade C (Which is equivalent to grade 5 or grade 8.8 in metric), should be torqued between 70 and 95 ft-lbs, which falls in line with the factory recommended spec.
     
    Last edited: Sep 15, 2016
    deeezy and TacoRD16 like this.
  16. Sep 15, 2016 at 2:39 PM
    #196
    Benson X

    Benson X [OP] ...and we're back!

    Joined:
    Nov 13, 2010
    Member:
    #46123
    Messages:
    5,234
    Gender:
    Male
    First Name:
    Ben
    Olympia, WA
    Vehicle:
    '11 MGM DC/LB
    If you don't draw blood, you're doing it wrong!
    I think you're mistaken - the confusion comes from the fact the Toyota FSM calls for the rear U-Bolts to be torqued down to 37 ft./lbs. - Thirty Seven!!!
    [​IMG]
    That's why so many of us raise a stink about it.
     
  17. Sep 15, 2016 at 4:00 PM
    #197
    AP-Tanner

    AP-Tanner Well-Known Member

    Joined:
    Aug 9, 2016
    Member:
    #194173
    Messages:
    64
    Gender:
    Male
    First Name:
    Tanner
    Hamilton, MT
    Vehicle:
    2007 Toyota FJ Cruiser
    AP front/rear bumper, AP Sliders, AP IFS Skid, 3" Lift, 34/10.5/17 BFG AT KO2, BMC, Blacked out
    I understood that, which is why I suggested cross referencing a general chart like the one that I posted earlier. You can see for the U-Bolt dia, the min and max values are 70-95 ft-lbs. In my opinion, this verifies what others have said about the 37 being transposed, and that it should actually be 73.
     
    Crom likes this.
  18. Sep 15, 2016 at 4:06 PM
    #198
    Crom

    Crom Outside

    Joined:
    Jun 22, 2009
    Member:
    #18782
    Messages:
    9,048
    Gender:
    Male
    First Name:
    Nick
    San Diego, CA
    Vehicle:
    2009 4x4 DCSB Overland Build
    Millions
    lol circle jerk conversation going on here. I understood @AP-Tanner 's post. He was posting some useful info... No harm in that.

    Regarding the leaf spring misprint... That has been debated for years. And it's kind of dumb at this point. Anyone who works with threaded fasteners in that size, and spring shops especially, will laugh their asses off at the 37 ft.lb It's an obvious error.
     
    AP-Tanner and BudMan like this.
  19. Oct 27, 2016 at 11:57 AM
    #199
    TacoSauceHB

    TacoSauceHB Thats what she said

    Joined:
    Sep 5, 2015
    Member:
    #163484
    Messages:
    133
    Gender:
    Male
    First Name:
    Brian
    Huntington Beach, CA
    Vehicle:
    07 prerunner trd off-road
    Headers , exhaust , coil overs , UCA's , uniballs , spindles , wheel/ tires , led bar , hid lights , tint and a 10" sub
  20. Oct 27, 2016 at 12:40 PM
    #200
    Chickenmunga

    Chickenmunga Nuggety

    Joined:
    Apr 10, 2008
    Member:
    #5877
    Messages:
    7,108
    Gender:
    Male
    First Name:
    Mike
    Hillsboro, Oregon
    Vehicle:
    08 TRD Offroad DC 4x4 (read the build)
    I think I might make a poster out of that for the garage
     
To Top