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Old 05-17-2014, 11:29 AM   #1
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torque for aluminium wheels

I just got new tires and want to torque the wheels with the right torque.
I have the 8 bolt axles and 9x17 Mickey Tompson Aluminium wheels. My maintanance book says 170-230 Nm. I think that is realy a lot and i am affraid to take this for the aluminium rims.
What do you think?
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Old 05-17-2014, 11:55 AM   #2
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Re: torque for aluminium wheels

For similar (American Racing Mojave) wheels, The spec is 140 ft-pounds.
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Old 05-17-2014, 12:15 PM   #3
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Re: torque for aluminium wheels

That is correct, however I tend to err towards the high side with alloys, and I check them periodically. Then mine were new, I had tighten than every 100 miles for 500 miles, then every 500 miles until about 5,000 miles. Now they finally seem to hold about 15,000 miles.
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Old 05-17-2014, 12:54 PM   #4
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Re: torque for aluminium wheels

Whow thats realy a lot...my Landcruiser i had before needs 110 nm = 80 ft-pounds. I am surprised
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Old 05-17-2014, 05:41 PM   #5
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Re: torque for aluminium wheels

I was just confirming this with my mechanic, but the answer is: it doesn't matter if your wheels are aluminum or platinum, the torque spec is based on the bolts/nuts. It might be that you got special nuts or replaced your studs, but if they are stock use the stock torques. It's 140 for my E250, and I think that holds for E350's as well. Discount Tire has a chart (and note it doesn't specify wheel type).

Over torquing is not a good thing. A fastener has a bit of stretch built in at proper torque; overextending this can actually defeat that, and the fastener loses holding power. Not to mention stripping threads, gouging the holes in the rim or otherwise doing damage to the studs.

That range you give, 170 to 230 Nm, does sound a bit strange, since it's so wide. My van has an owner's manual with the spec right in the tire changing section, and it's exactly 140 ftlbs, which would be 190 Nm.

Here are some example torque values from Discount Tire:

E150 1975-06 100 ft-lbs
E150 (8 Lug) 2007-08 140 ft-lbs
E250/350 (8 lug 9/16"-18) 1988-08 140 ft-lbs
E Super Duty (10 lug) 2002-08 165 ft-lbs
F150 (12mm stud) 1988-00 *100 ft-lbs
F150 (14mm stud) 2000-08 *150 ft-lbs
F250/350 (8 lug 9/16"-18) 2001-03 160 ft-lbs
F250/350 (8 lug 9/16"-18) 1999-00 150 ft-lbs
F250/350 (8 lug 9/16"-18) 1988-98 140 ft-lbs
F Super Duty
(10 lug 9/16"-18) 1999-08 165 ft-lbs
(10 lug 9/16"-18) 1996-98 140 ft-lbs

Autozone also has a torque calculator.

Frankly, I've never seen a vehicle with such a range as the torque values you listed. I'd check again. Is that for one model vehicle or a range of vehicles?
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Old 05-17-2014, 11:27 PM   #6
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Re: torque for aluminium wheels

140
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Old 05-18-2014, 11:00 AM   #7
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Re: torque for aluminium wheels

Quote:
Originally Posted by rob_gendreau

That range you give, 170 to 230 Nm, does sound a bit strange, since it's so wide. My van has an owner's manual with the spec right in the tire changing section, and it's exactly 140 ftlbs, which would be 190 Nm.

Yes i know, i also was wondering about it. In that range you will not need a torque ratch

Maybe u understand something wrong and they mean first to last step of tightening???

See here:



Thanks all for your help, i will take 140 ft-pounds and check it after a while
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Old 05-26-2014, 01:34 AM   #8
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Re: torque for aluminium wheels

Check with the wheel manufactuer for torque spec 140 is for steel wheels aluminum should be less? Aluminum will crystalize at high torque >?
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Old 05-26-2014, 02:07 AM   #9
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Re: torque for aluminium wheels

Quote:
Originally Posted by 1bajaboy
Check with the wheel manufactuer for torque spec 140 is for steel wheels aluminum should be less? Aluminum will crystalize at high torque >?
That will be a problem for me as i am living in germany.... But it is a good idea, i will send them an mail, hope to get a answer.
But if i saw it proper my wheels have steel inserts in the holes ....
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Old 05-26-2014, 03:31 PM   #10
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Re: torque for aluminium wheels

Quote:
Originally Posted by 1bajaboy
Check with the wheel manufactuer for torque spec 140 is for steel wheels aluminum should be less? Aluminum will crystalize at high torque >?
Crystallize? Dunno about that. But the torque depends on the fasteners. And they aren't aluminum. The torque you measure can be affected in some ways by the friction against the fastened surfaces. Do it dry; if, for example, you used lube on the threads/surfaces you might end up overtorquing the fastener leading to failure. But I think in some applications you DO use oil (semis, eg). The number range the OP quoted I think comes from a Haynes manual for a generic M14 bolt. I see the same quote in my Haynes. But that does NOT mean it's the proper torque for the wheels, since there are variables like material, grade, etc. And I don't think Ford used M14s although they are close to 9/16 diameter, but the thread pitch is a BIG factor.

I have never seen anything but 140 for my 2001 E250. Regardless of wheels. And again, it's in the owner's manual if you can find one for your year.

The only variable that should have anything to do with torque and aluminum may be what bajaboy was alluding to. If you purchase a wheel of a material that cannot handle the fastener's proper torque (140 ftlb here) then don't use the wheel. A bolt is kinda like a linear spring; it expands, which clamps the stuff together. To get a 9/16" bolt to do that requires considerable force. If you were use less force no elongation hence no proper clamping. If you were to use a wheel that couldn't handle that amount of force you'd need to choose a smaller fastener. And of course you have to consider shear forces as well.

But none of this should be a problem with a non-defective alloy wheel made for use on a light truck/van. If the 140ftlbs distorts the metal in the wheel, assuming you are using the proper lug nuts, then I imagine you've got a defect.
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