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Torque specs

Discussion in 'Ford Raptor Problems and Questions Forum' started by pirate air, Feb 23, 2012.

  1. bigrig

    bigrig Full Access Member

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    I have seen "torque to yield" in the torque specs. I have tried looking up what this means but haven't been successful at understanding how to do this.

    Can I get confirmation on some of my assumptions and some advice on the issues?

    My situation:
    I will be installing the RPG stage 3 rear suspension with the Deaver HD springs. The spring u-bolts in the torque spec sheet is labeled torque to yield (TTY).

    My assumptions:
    TTY is making sure the u-bolt stretches when torquing down the nuts. One approach I have read was to torque down the nut to a specific torque then tighten 1/2 turn more. I also assume that the nuts have to be tightened in a repeated X pattern to ensure all nuts are getting tightened similarly.

    Question:
    If my assumptions were correct, then can a member help me figure out what torque I need for the u-bolt nuts before I continue with my half turn more? If my assumptions are incorrect then can a member help me figure out how to approach this?

    Thanks!
     
    Last edited: Feb 2, 2016
  2. 2014RubyRed

    2014RubyRed FRF Addict

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    I'm not too sure about the half turn more method. I just did springs and this is what I did:

    1st torque - star pattern (like torqueing a wheel) - 26 lbs
    2nd torque - 52 lbs
    3rd torque - 74 lbs
    Final torque - 98 lbs

    I then went back and redid the final torque again about 100 miles later.
     
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  3. KaiserM715

    KaiserM715 Kaiser Söze

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    Torque to yield means that they are one time use only because they get stretched to the point that they will not return to their original length (plastic deformation). There are indeed some TTY bolts that have an angle applied to them after they are torqued to a certain value (usually for GM cylinder head bolts), but that is not the case in this application. @pirate air is / was a Ford tech and would have noted it as such.
     
  4. bigrig

    bigrig Full Access Member

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    This is perfect, thank you so much 2014RubyRed!
     
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  5. Raptor911

    Raptor911 FRF Addict

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    I am doing new rotors and pads this weekend so can someone confirm if I am reading this correct:

    Front Brakes:
    - caliper guide pin bolt (2 bolts) >> 27 foot-pounds
    - caliper bracket bolts (2 bolts) >> 184 foot-pounds

    Rear Brakes:
    - caliper guide pin bolt (2 bolts) >> 22 foot-pounds
    - caliper bracket bolts (2 bolts) >> 122 foot-pounds

    Thank you!
     
  6. bigrig

    bigrig Full Access Member

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    Confirmed, looks right. I am not sure if you are referencing the spreadsheet I posted earlier in this thread, but your numbers match the torque specs there. Thanks again to pirate air for the original post.
     
  7. Raptor911

    Raptor911 FRF Addict

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    I did reference that sheet and wanted to make sure I was reading it correctly. Thank you for the confirmation.

    I am doing the rears now and will post some pics when done. :)

     

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