Wheel studs

DOEDOE92

MEMBER
2000 CHEVROLET LUMINA
202,000 MILES

Alright so somehow or another my wheel studs have broken off. I only have 2 1/2 of 5 left. It began when I noticed the rims on my car belonged to a Pontiac not my Chevy lumina. The problem this caused was that the rim was touching the caliper as I drove. I put spacers on temporarily till I could afford new size 15 tires. My tires currently are 16 and a factory rim I need is a 15. Well the spacer only seemed to help the front left tire. The passenger tire required locks on the rim. I put the 2 I had and then a couple original lug nuts fit. I had four on it's at this point. Short time later maybe a couple weeks, the tire shook because everything but the 2 locks stayed on. After that happen I took the spacer off the passenger tire and put the locks and new lug nuts on there. Well that had been a few weeks now, maybe a month, and a few days ago the wheel shook again and the wheel studs holding the locks broke and half another one.

With that being said I don't see much instructions on how to or what to need or expect when I do this. Could anyone possibly lend me some detailed advice?

1 Reply

CARADIODOC

MECHANIC
33,870 POSTS

I can offer a few observations. The biggest cause by far of broken studs is failure to use a click-type torque wrench on the nuts. A car like yours will typically call for around 90 - 100 foot pounds. It is real easy to over-tighten them which stresses the nuts and the studs. Using the torque wrench also insures they're all tightened exactly the same amount. That makes the clamping forces equal all the way around and prevents warping the brake rotor. All professionals use torque wrenches. Failure to do so could get them fired.

Look at the rounded friction surfaces where the nuts and wheel contact each other. Once the nuts come loose on a wheel, that wheel and the nuts must be replaced because it is going to continue to do that. The friction surface will become rough and worn and won't make full contact. That will let the nuts work loose again very quickly.

Some people put grease on the studs to prevent rust. A tiny little bit is okay, but then the nuts must be run on by hand, ... No air tools. The centrifugal force when using air tools causes the grease to build up ahead of the nuts and spray onto the friction surface. There must be absolutely no grease between the wheel and nuts. That friction surface is what keeps the nuts tight.

If you used anti-seize compound anywhere on the studs, get that completely washed off. That stuff has its uses and wheel studs is definitely not one of them. Mechanics will be fired for doing that.

Any type of spacer between the wheel and hub is a very bad idea. The forces from the wheel flexing will crush what's stuck in there and allow the wheel to work loose. The wheels already flex every time they go around. With spacers in there, there's no way the wheel can make full contact and it's going to really flex a lot more. That will work the nuts loose repeatedly and could lead to a fracture and broken wheel.