Why Rotors Warp - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-18-2005, 08:12 PM   #11
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I've never warped rotors from not using a tq wrench..I snug them down until they're firm, then I'll wrap'em down with the impact on about a medium to a 3/4 power setting.
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Old 10-18-2005, 11:25 PM   #12
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Walmart uses sticks and a wrench, On most cars the stick gets with within 10 pounds or so when you click it. As long as they're not just ramming that thing or letting it sit and hammer I'm fine with them.
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Old 10-18-2005, 11:28 PM   #13
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Using a torque wrech to go back and test how tight your lugs are is pretty pointless. In fact, your time with the torque wrench in hand would be better spent starting over and torqueing them yourself.

In cases where people are suffering from prematurely warped rotors, where inferior parts can be out ruled, I would say 90% of the time over tightening is the cause. Wether the installler realizes it or not.

I used to have an old tool catalog full or useful info such as: the average inexpensive torque wrench, when used infrequently, can become read as much as 30-40% off from actual within a year'* time- and they often arent worth having calibrated. If you want a torque wrench to rely on, spend the $ for a quality professional grade one. Also, using a deep well socket when not needed, and using even a short extention throws off the readings. If you are only using your unit for checking lug nuts, have it calibrated with the extention installed.

[quote="jr's3800"]
Quote:
Originally Posted by BillBoost37
I watched sears do it once, I firsy saw them use an impact, then they lowered the car onto the ground and torqued all of the lugs to spec with a torque wrench
Actually this is the procedure at chain stores due to the fact that the minimum-wage idiots working there are very prone to forgetting to reinstall all the lug nuts. The theory is that these ****-ups are eliminated by double checking.

Torque sticks are an interesting invention, and are becoming the industry standard. Its really up to the user to judge wether or not they really are accurate.

An expierenced mechanic is able to properly install lugs WITHOUT overtightening without anything more than their regular impact gun. They do it "by feel" if you will.
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Old 10-18-2005, 11:29 PM   #14
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Anyone got a picture of a "stick"?

Only torquing device I know of is a torque wrench. The one I use on tires goes up to 150 ft. lbs.
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Old 10-18-2005, 11:35 PM   #15
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Quote:
Originally Posted by vital49
Anyone got a picture of a "stick"?

Only torquing device I know of is a torque wrench. The one I use on tires goes up to 150 ft. lbs.
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Old 10-19-2005, 01:11 AM   #16
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Quote:
Originally Posted by optmusprimer
Using a torque wrech to go back and test how tight your lugs are is pretty pointless. In fact, your time with the torque wrench in hand would be better spent starting over and torqueing them yourself.
I'd have to disagree with you, since virtually all of the nuts were significantly looser than spec and none were tightened to an equal clampling force. My torque wrench is a craftsman beam type with a floating pointer, and I'll bet a pair of new rotors it got my lugnuts more evenly tightened than they were before I began. I might be 5 pounds off, but I sure as heck ain't 20! or 60!!!! I'm not sure about your comment re torqueing them myself, but that is what I did, and why I brought the wrench. I merely noted the torque on each nut as the nut began to move during tightening. I did not expect the garage to be perfect, but I was amazed at how greatly the clamping force varied from bolt to bolt.
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Old 10-19-2005, 02:52 AM   #17
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What bill said x 2.


An impact wrench should never come within 10 foot of an aluminum rim.
An impact wrench should never come within 10 foot of a removable rotor.
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Old 10-19-2005, 03:32 AM   #18
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Default Re: Why Rotors Warp

Quote:
Originally Posted by bill buttermore
Took the SSEi to a local garage to have the tires balanced this morning. On a hunch, I took my torque wrench, a short extension, and a 3/4" deep socket along. When they were done, before I drove away, I torqued all the lug nuts to 100 ft-lbs. They had used an impact wrench to tighten the nuts. On the left front front wheel, here are the torque settings I found as I tightened the nuts in a star pattern:

..................................40

.......................80..................70

.............................50.......60

With this kind of uneven tightening, is it any wonder that rotors warp? Of course, they do brakes, too. I'll bet they change a lot of rotors.
i never knew that uneven tightening could warp the rotors...i always use the factory wrench thingie that came with the jack, tighten my hand until its really hard and step on it just to be sure lol, i have the reallllly cheap rotors and pads on mine (autozone valucraft rotors and pads) and they have yet to warp on me, smooth effective braking. guess my foot torques things to spec huh lol
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Old 10-19-2005, 08:38 AM   #19
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Quote:
Originally Posted by optmusprimer
Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by BillBoost37
I watched sears do it once, I firsy saw them use an impact, then they lowered the car onto the ground and torqued all of the lugs to spec with a torque wrench
Optimus.. please spend more time getting your quotes right. Jr's3800 said this.

And if you think a mechanic can get them to the correct torque by feel you are mislead. I know many mechanics. They can get reasonable with an impact, there are too many factors though. Air pressure for example. A good mechanic will torque stick or torque wrench.
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Old 10-19-2005, 09:06 AM   #20
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Quote:
And if you think a mechanic can get them to the correct torque by feel you are mislead. I know many mechanics. They can get reasonable with an impact, there are too many factors though. Air pressure for example. A good mechanic will torque stick or torque wrench.
read again
Quote:
An expierenced mechanic is able to properly install lugs WITHOUT overtightening without anything more than their regular impact gun.

<shrug> hey its not like I spent years working as a mechanic, or learned tricks of the trade from 30+ year veterans right?
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