Quote:
Originally Posted by John 070
I've used a torque wrench for over 10 years, never giving it any thought. One weekend I loaned my tools out, and figured I'll just tighten the nuts when I get my wrench back. Wouldn't you know 2 days later the car began shaking--at 15-25 mph.
It's really important to retighten with aluminum rims. I find it takes 3X.
p.s. although I use anti-seize on the hubs, I would NEVER use it on the nuts. Nothing like invalidating the use of a torque wrench.
I thought all BMW dealerships hand torqued the lug bolts, but I may be wrong. Perhaps non-dealers use the impact wrench and overtighten, because as I said, it seems to take 3X of retightening to get it right. If they simply do 120 lbs. ft., it'll probably stay overtightened.
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Yes on the never seize around the hub. Nothing like beating the hell out of a rim and tire to try to get it off the vehicle. But I think you have to consider how the never seize is used as a factor. I was always taught an extremely light coat on lugs . So light so it wouldn't come up through the lug once it was tightened down . The difference on the actual torque would be negligible .Remember too the torque specs are based off of a new clean nut or stud. I'm betting very few people actually wire wheel the studs or chase the lug nut threads with a tap and clover to clean them up.As I posted before, I have 25+ yrs as a professional mechanic. There was a time when never seize was always used.I've never had one wheel ever come loose off the 1st torque ,aluminum or steel, or warped a rotor and I personally do all our brakes. Large and small vehicles.This is all while using never seize. Now it seems nobody can decide that if the torque is affected , by how much? As I said before if BMW says don't use it ,
then don't use it. But if you end up being 3lbs off, that can be equal to the inaccuracies in the wrench itself...and no I don't don't have Harbor Freight specials. Most of my tools are Snap ons.We have torque wrenches that are small and one that is about 4' long for big work
Well I guess this kinda proves what I was getting at about the application of never seize.
http://www.tirerack.com/wheels/tech/...sp?techid=107&