Today I had a training about tires and wheels.

"RotaryLover" (rotarylover) 09/23/2013 at 22:33 • Filed to: Tires

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Did you know that if you hear popcorn sounds when you press the sidewall, it means that the metal wires are cutting up and that the tire could explode at any moment when it's over 80% of the maximum psi that you can run the tires? As demonstrated here

Also, NEVER put anti-seize on the threads of the lug studs. They showed us a vid about the pressure that you put on the wheels if you add 3 drops of 30 weight motor oil on the studs and the nuts (new and old), without oil (new and old) and then with anti-seize. The torque wrench was set to 500 lb-ft. . Basically, the anti-seize had a low torque number of 420 lb-ft when the torque wrench clicked and the pressure was about 26000 lbs. The used nuts and lugs torqued dry got 440 lb-ft and 36000 lbs of pressure. Now if you add oil on the used ones, you get 460 lb-ft and 40000 lbs of pressure. The new ones without oil gets 487 lb-ft and 50000 lbs of pressure and finally the new ones with oil gets 497 lb-ft and 56000 lbs of pressure. So there you go, forget putting never seize and add 3 drops of motor oil instead. That way, you know that your wheel wont fall off due to vibration and lack of pressure, will get at the right torque and that the nuts wont jam.

The rest well...I think you guys already know.

dogisbadob > RotaryLover 09/23/2013 at 22:48

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I don't use Firestone tires :)

RotaryLover > dogisbadob 09/23/2013 at 23:13

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-_-

VincentMalamute-Kim > RotaryLover 09/24/2013 at 09:44

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Who is the "they" saying all this? Not that I don't believe them but I'd like some details of who I'm believing. And before I start spreading this around to my friends.

And why are they torquing to incredibly high values of 500 ft/lbs? Are these Boeing 747 wheels?

RotaryLover > VincentMalamute-Kim 09/24/2013 at 11:34

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That's the torque that you gotta torque the wheels of a semi-truck, coachs, city buses and anything remotely close to that. You didn't know I was a semi-truck mechanic right?

VincentMalamute-Kim > RotaryLover 09/24/2013 at 14:13

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Makes sense. Didn't know you were. Still surprised that semi truck torques are that high.

So the info about putting motor oil, not antiseize on lug nut threads is from truck mechanic educational video? That's good info - I had used antiseize in the past. Then a friend told me dry.

And I assume this extrapolates to the lower torque values on a car?

RotaryLover > VincentMalamute-Kim 09/24/2013 at 14:17

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To my eyes, yes. It's the same thing except that it's smaller.

ThatWillBuffOut > RotaryLover 09/24/2013 at 16:31

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I don't have any experience with torque wrenches, so I have a quick question. Why was the wrench clicking before it got to it's designated torque?

RotaryLover > ThatWillBuffOut 09/24/2013 at 17:00

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Basically, the torque wrench thought it was at 500 lb-ft. The lug studs are designed to stretch a bit when you tighten them to the proper torque to get the maximum pressure you need on the wheels (on some occasion the brake disks too) and go back to the normal length when they are loosen. Anti-Seize acts as if you added material on the threads of the studs so when you torque the nut on them, it doesn't stretch as much since the Anti-Seize that fills the threads does not compress. You end up hitting your torque value earlier not knowing that it can go further, that instead of hitting 500 lb-ft you hit 420 lb-ft and this is why it's so easy to remove your nuts after that. When it's dry, it's the friction from metal to metal with rust and other contaminants that causes the lower torque. When you clean with a brush wire the threads and put motor oil, it wont stop because of friction and will stretch the studs further to the designated torque and pressure. Oil can be compressed MUCH more than Anti-Seize.

VincentMalamute-Kim > RotaryLover 09/24/2013 at 17:42

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Can you give the name /source of video information? My friend disagrees: "Don't like these conclusions at all. Always was told to torque dry. Oiled nuts despite exerting more psi pressure for the same torque setting still would vibrate loose easier than nuts torqued dry."

RotaryLover > VincentMalamute-Kim 09/24/2013 at 18:02

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I tried to find the vids but I can't. I'm still looking for them though. You gotta always re-torque the wheels after 80 to 160KM of driving, if you don't then you got 50% chance that they will fall off. It's probably what happened to theses people who's wheels felt off or the studs were over torqued before and can no longer get to the right torque since the studs were stretched over their limit of stretching. Also remember that it's only 1 to 3 drops of 30 weight MOTOR OIL and lots of people over abuse on that! Torquing them dry is not a bad thing, for sure it wont get loose since the metal on metal contact will keep it from loosing but you'll never get the optimal torque and pressure that way.

ThatWillBuffOut > RotaryLover 09/25/2013 at 12:49

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Interesting. I didn't know there was so much involved. Thanks for more detail.

RotaryLover > ThatWillBuffOut 09/25/2013 at 12:57

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Also I want to add that you always have to re-torque your wheels after the first 80-160km because while you drive, it settles and gets a bit loose.

ThatWillBuffOut > RotaryLover 09/25/2013 at 15:32

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I did know that bit. Haha.