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What do I torque pinion nut to ( 14 bolt FF )

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TX Mudder, Sep 17, 2001.

  1. TX Mudder

    TX Mudder 1/2 ton status

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    Well, when I took the nut off I used chalk to make a mark and counted the turns to take it off. The chalk is gone now and because of the trobules I've had with taking the yoke off (and due to my obvious lack of ability to use a pen and paper) I've forgotten how many turns it took.
    So I'm faced with tightening the pinion nut on my 14 bolt. I looked up in my manuals and the closest I can find is where it says:
    On the Chrolet 12 1/4 in. tighten the nut to 220 ft. lbs. and on the Rockwell 12 in. tighten the nut to 350 ft. lbs.
    I
    I've never heard of a Chevy 12 1/4, so I can only assume they mean the 10.5" FF rear axle. Am I going to kill my pinion bearing if I torque to 220 ft. lbs.?
    It seems like I'll be safer undertorqueing it and using red loctite rather than overtorqueing it.
    Thatk30guy, maybe you have a suggestion (other than write it down next time ;) ?
    -- Mike

    <font color=blue> At some point I'll be done building my truck and can actually go wheeling. Until then, I guess sex and alcohol will have to do. &lt;img src="http://coloradok5.com/forums/images/icons/tongue.gif"&gt;
     
  2. tlarsw

    tlarsw 1/2 ton status

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    I just replaced the 1350 yoke with a 1410 and replaced the crush washer at the same time. The shop that I talked to said 350 foot lbs for the crush washer. They did it for free!

    1986 K10 TPI350/NV4500/Gen2 Doubler/D60(ARB)/14FF(Detroit)/4.56 gears
     
  3. TX Mudder

    TX Mudder 1/2 ton status

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    The crush washer is the washer that is directly below the nut? It looks like a regular washer?
    -- Mike


    <font color=blue> At some point I'll be done building my truck and can actually go wheeling. Until then, I guess sex and alcohol will have to do. [​IMG]
     
  4. mnstr_fx

    mnstr_fx Registered Member

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    Do Not Torque to 350 Ft*lbs! I did and then got to take it back apart because the pinion bearings had WAY too high preload. If you put in a new crush sleeve, it is going to take a bunch of torque to get it to start to crush. Once it starts to crush, it will take less torque, ~200-250 ft*lbs I seem to remember. Be sure to keep checking both pinion end play, (this will help to show you when you have fully crushed to sleeve and are now setting bearing preload), and bearing rolling resistance, (this is critical!). An 1/8 of a turn after zero pinion end play can be a lot of bearing preload. You will be using a 4' cheater pipe by this point so make small turns, and then recheck bearing preload. Don't over tighten, because you can not loosen it.

    76-82 Chevy Pickup / Blazer - K5-K10-K30
    90' TBI
    TH 400
    203 / 205 Doubler
    Dana 60, Corp 14 - 4.88'd - Detroit Locked
     
  5. TX Mudder

    TX Mudder 1/2 ton status

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    How do I measure those two things?
    I did a search and didn't come up with anything.
    -- Mike


    <font color=blue> At some point I'll be done building my truck and can actually go wheeling. Until then, I guess sex and alcohol will have to do. [​IMG]
     
  6. ftn96

    ftn96 1/2 ton status

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    2 ways. Inch pound torque wrench that will read that low of a number which will be "VERY" costly.
    Or some do it by feel. The "feel" people are way more experienced that you or I so the top one is re-commended.
    But wes may be able to tell you how to "feel" the pre-load.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Ok, doing the pinion nut on a 14FF is pretty simple. (if you have the right tools)

    First off, the torque for the pinion nut is totally on the 'rolling torque'.

    You need to get the crush sleeve down (if its new) and once you have where the sleeve will 'crush', you need to tighten the nut a little bit at a time and use an "inch-lbs." torque wrench to check the rolling torque.

    What the "inch-lbs." torque wrench does is tells you the reading to get the nut tight to where the bearings wont bind up or have too tight of torque on them.

    This set up is called "pinion bearing pre-load".

    If you are using new bearings, the reading needs to be between 25-35 in.lbs.
    If you are using the old bearings, the reading needs to be between 5-15 in.lbs.

    What you do is tighten the nut with an impact, a little at a time, not forcefully where the nut wont move anymore, and take the inch-lbs torque wrench and turn the pinion and watch the lever on the wrench until you get the correct reading for the 'rolling torque'.

    This whole set up needs to be done with the pinion carrier support removed from the axle or with the ring gear out of the differential.

    DO NOT do the torque reading with the ring gear mated to the pinion. The ring gear will give too much resistance to the rolling torque and will give you a false reading.

    Hope this answered some questions.

    <font color=red>I'm a "black top mudder"!!!</font color=red>

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  8. ftn96

    ftn96 1/2 ton status

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    Ok, where can a fella pick up an inch lb torq wrench that will read that low a number that wont cost $295 like the one from Snap-on? And not one of those 19.95 POS from JC Whitney eaither.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  9. Executioner

    Executioner 1/2 ton status

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    At a Fish and Tackle shop.
     
  10. ftn96

    ftn96 1/2 ton status

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    YOu care to elaborate?

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  11. californiak5

    californiak5 1/2 ton status

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    And do you go to a tool store for fishing suplies?

    [​IMG]

    [​IMG] <font color=green>Born to Drive My K5</font color=green> [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/californiak5>CaliforniaK5's Pictures</a>
     
  12. ftn96

    ftn96 1/2 ton status

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    Yeah, instead of getting bait, you get an air compressor and a nail gun. [​IMG]

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  13. TX Mudder

    TX Mudder 1/2 ton status

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    Well, I put it back on. Without the benefit of Wes's post (did it before he wrote that.) It might be 4 turns too loose. or 4 turns too tight. I don't know.
    I do promise not to whine if it breaks.
    Oh well, I want to go 4.56 anyway so it it goes out, then that's all the more reason to do it.
    BTW, I used a 380 ft. lbs impact and did not let it bottom out. What I did was...ahem...tighten it till it looked about like it was before I started. If I have to guess, I'd say it's too loose. Time (and money) will tell.
    -- Mike


    <font color=blue> At some point I'll be done building my truck and can actually go wheeling. Until then, I guess sex and alcohol will have to do. [​IMG]
     
  14. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Its quite simple really...those scales they have for weighing fish are in pounds. Attach the hook end to a breaker bar and pull while watching the scale.

    Crude but effective...[​IMG]

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  15. ftn96

    ftn96 1/2 ton status

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    I gotcha. But in the meantime I found a click type from Harbor freight. It's runs from 20-200 inch. I know it wouldn't stand up in rear end shop but for my one or 2 hear and there it will do the trick. $37

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  16. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Cool, I was just pointing out that Executioner wasn't out to lunch on this one...the fish scale things are great for checking that sort of stuff.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  17. ftn96

    ftn96 1/2 ton status

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    I've heard of doing that to check the "upper ball joint pre-load"
    DOE!! Im sorry, thats Executioner's phrase!!![​IMG]
    All is good.

    "you know... the guy with the BAD A$$ spring perches!!![​IMG]
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  18. californiak5

    californiak5 1/2 ton status

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    Thats a cool trick. I would have never thought of that one. I knew Ex was getting at something (he always is), I was just trying to get it out of him. [​IMG]

    See Ya,
    Keith

    [​IMG] <font color=green>Born to Drive My K5</font color=green> [​IMG]

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  19. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Aww right!!! Yeah, I remember the famous quote, "upper ball joint pre-load"!!!!!!!!!!!!!!!!!!!!!!!! [​IMG] [​IMG] [​IMG]

    <font color=red>I'm a "black top mudder"!!!</font color=red>

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  20. Executioner

    Executioner 1/2 ton status

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    Sorry I did not have time to spell out the whole story, but looks like yall got it.
     

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