No friggin way. Tighten front lug to 76 pounds and BAM Snap! WTF!?

 

What the the hell are you talking about?

Are you saying you broke a lug? The crappy tire shop that mounted mine torqued them with an impact and no torque stick.. took over 175 ft lbs to remove them (enough to break one of the mcgard locks) and nothing else broke. They will not break at 76 ft lbs unless something was already broken.

 

Just got off the phone with the dealership. Covered under warranty. Fault in the hub, was only torqued to 76 crazy stuff. Dealership told me to come in right now and they will do it immediatley under warranty.

 

um.. ok. I still am not sure what you are saying. I am assuming the stud broke.. which has nothign to do with a fault in the hub. Or maybe the hub cracked? Either way.. glad you got it taken care of...

 

Was this a hub or a stud?? Or was it even something else?? more info please.

 

uhmmm... ok.

 

wow this is the most uninformitive thread ever started... hey engifineer i broke my engine... what happened??? Can you please tell me

Sorry I'm just messing with the thread starter but if you're going to have an angry thread name like that and talk about things breaking be VERY specific as to what broke. And pics are always fun

 

Follow up:

Sorry for the lack of details. I had to rush to the dealership as we were about to leave for Hollywood. It was the actual stud that sheared off. The dealership replaced covered under warranty, and checked all the other lug bolts too. Torque was right just a freak thing I suppose. Sorry no pics. The dealership took the stud and bolt as part of the warranty claim. Anyway, all is good and off to Hollywood.

 

well glad to hear all is well Enjoy the trip

 

big ups to engifineer. sinickest guy ever.

 

off to hollywood?? movie star?? lol..

 

^ haha, no the Scion nights of Hollywood. Anyway here you go folks mystery solved.
Torque wrench = accurate
Torque wrench + extension = NOT ACCURATE!

If many of you already know this great, but for those that dont here you go.

I had a 6 inch extension on the torque wrench when I was tightening down the lug nuts. Well, that apparantly means that the 76 ft pounds f torque was generated at the end where the etension met the wrench NOT at the lug nut. I found an equation last night to figure it out. Just didn't compensate for the "twist and torque" of the extension. So all in all to reach 76 ft pounds with an extension I should have set the wrench to about 55 pounds.

 

An extension does not change the amount of tq delivered to the lug nut. Tq is simply F*D. The D in the equation is the difference from the point of leverage to the center point of rotation. An extension moves the wrench outward, it does not make it longer. Unless you are talking about an extension to make the wrench itself longer. And that only applies if it is extending the driving end.

If you are just talking about a normal extension between the ratchet head and the socket, it does not affect the reading that way.

 

thats what I was thinking but I'm no engineer so i just let it go

 

You need to also realize however that if youa re using a 6 inch extension that as you torque the wrench down the wrench is clicking at the adjusted torque rating where the extension meets the wrench. The extension itself is twisting and developing an amount of torque on its own, thus increasing the amount of end torque. If I am wrong and you can verify this please shw me so I can have the correct information.

 

That does not increase the amount of tq. The extension is going to twist according to the amount of tq you are applying to it, so it isnt adding any additional tq. Once everything stops moving, you are applying the same amount of tq at both the end of the extension and the wrench.

 

Then I am really lost. Why would they have been so tight that they snapped when the wrench was only at 76 then?

 

I have no idea, either an already cracked or flawed stud or the wrench was way off.

 

Well to really understand you need to know how a torque wrench works. I personally do not know but I know the instructions with my bigger torque wrench said that I had to apply the force at the black handle and that I could not use a "cheater bar" to make it easier to torque a nut. It said it will not be accurate. Now adding an extension to the actual socket does not change the torque accuracy of a torque wrench.

 

Long story short. I invested in a high quality torque wrench and I feel much better about the issue not taking place again. Lesson learned, invest in QUALITY tools especially a torque wrench. Thanks for everyones help and input.