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450 ft pounds!!!

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Britcheflee
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Joined: 20 Aug 2007
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Location: Placerville California

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PostPosted: Tue Oct 02, 2012 5:56 am    Post subject: 450 ft pounds!!! Reply to specific post Reply with quote

I see that the rear axle main nut needs to be tightened up to 450 ft pounds - guess I am going to have to put a large pipe wrench on it with an extra piece of pipe to lever that down!
I dont even think my torque wrench setting goes up that high.

Lee
 
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Ultradog MN
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Joined: 22 Apr 2001
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Location: Twin Cities

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PostPosted: Tue Oct 02, 2012 6:07 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

It's not that much really.
If you weigh 150 lbs, hanging on the very end of a 3' long wrench would get you there.
 
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CJ in Michigan
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PostPosted: Tue Oct 02, 2012 6:40 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

2' does it for me-
 
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Britcheflee
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PostPosted: Tue Oct 02, 2012 6:55 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

CJ in Michigan wrote:
(quoted from post at 07:40:33 10/02/12) 2' does it for me-



I guess that compresses down the inner rubber seal on the spline of the axle as well to make the hub seat properly?
 
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Dell (WA)
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PostPosted: Tue Oct 02, 2012 7:59 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

Lee........NO, the BIG NUT only touches the shoulder of the splined axle thru 1-washer. Look at yer FO-4. And YES, 450ft/lbs BEFORE you put the snap-ring on the outside of the BIG NUT. Iff'n yer really sphincterly challenged, you can RENT a 3/4"-drive torque wrench with 1-15/16 socket. And NO, you don't want to buy a 600ft/lb 3/4"-drive torque wrench. ........the tite Dell
 
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Ultradog MN
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PostPosted: Tue Oct 02, 2012 10:56 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

LOL
We must weigh about the same amount.
 
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Jerry/MT
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PostPosted: Tue Oct 02, 2012 11:47 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

Use a cheater bar and stand on it! 450 ft-lbs means "real tight".
 
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Den N Ms
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PostPosted: Tue Oct 02, 2012 1:52 pm    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

How about a 2" 3/4 drive socket?
 
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ASEguy
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PostPosted: Tue Oct 02, 2012 2:27 pm    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

I put RTV on the splines to prevent fluid leaking through.
 
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NoNewParts
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PostPosted: Tue Oct 02, 2012 3:49 pm    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

makes ya wonder what the actual torque reading is,
that you are applying, when you are trying to get a stubborn one
loose that has the threads bottomed out Very Happy
 
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Britcheflee
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PostPosted: Tue Oct 02, 2012 10:06 pm    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote



yes, did that, got it tight - but assuming I can really crank down on it when the wheel is back on?
 
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Hobo,NC
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PostPosted: Wed Oct 03, 2012 4:12 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote


In theory yes in reality no...

http://ytforums.ytmag.com/viewtopic.php?t=938730&highlight=bounce
 
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TheOldHokie
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Location: Myersville, MD

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PostPosted: Wed Oct 03, 2012 6:27 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

Hobo,NC wrote:
(quoted from post at 08:12:16 10/03/12)
In theory yes in reality no...

http://ytforums.ytmag.com/viewtopic.php?t=938730&highlight=bounce


No my friend - this is basic physics pure and simple. Torque is torque - friction has nothing to do with it. A 150# man on the end of a 3' bar produces exactly 450 lb-ft of torque. Jumping on the bar simply produces more than 450 lb-ft of torque becasue you are using gravity to "increase" your static weight (force) with an acceleration force.

Friction enters the picture when we try to use torque as an indirect measure of the clamping force (tension) created in a threaded fastener as we tighten it. That friction varies with the materilas the fasteners are made from and the condition of the threads (oiled, greased. plated. etc). All of those factors are already included by the engineers in the 450 lb-ft specification for tightening that nut. Applying a greater torque simply produces a tension greater than the engineers wanted.

TOH
 
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ASEguy
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PostPosted: Wed Oct 03, 2012 9:04 am    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote

If you wait the RTV would have set up and tightening more may "break" the seal. I put a rod between the lugs for the wheels and braced it against the ground when I tightened mine. Gerard
 
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Hobo,NC
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PostPosted: Wed Oct 03, 2012 5:49 pm    Post subject: Re: 450 ft pounds!!! Reply to specific post Reply with quote


If you are up to a challenge...

Loosen the lug nuts on your car/truck lay 100lbs on the end of a ft bar to tighten the nuts then go drive it... Make sure you insurance is paid up....

Let us know how it works out for ya...
 
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