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Slots & broken wheel studs

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,127
I put a set of slots on year or 2 ago I have now found 2 broken wheel studs, one was I was checking the tightness of the studs and one just broke with slight pressure, the other I just found in the garage laying next to the wheel, both are from the rear 1 each side. stud is inside the lug nut

wrong studs?
wrong lug nuts?

lugs are Mcgard 62000 slots say M&T I think on them
studs came with the axles Yukon 5 plus years ago
 

Scoop

Contributor
Have Bronco, Will Travel
Joined
Feb 1, 2006
Messages
10,805
Loc.
Cuchara, CO
Do your slots use tapered nuts or sleeve type nuts? Most vintage slots take these:

Magnut-open.jpg
 

tinytim02

Contributor
Sr. Member
Joined
Mar 14, 2007
Messages
613
Here's a pic of the tapered style. I used these on my factory Ford slots.
 

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Broncitis

MEB Founder
Joined
May 18, 2004
Messages
5,267
Were any other lugs loose?

Years ago on by first built Bronco I broke off studs when the lugs got loose on the way from out near your place to Dillsburg on the maiden voyage with the new lift, wheels and tires.

Ruined a brand new forged MT wheel and had to get a motel in Breezewood until we could get it fixed the next day.
 

Viperwolf1

Contributor
electron whisperer
Joined
Aug 23, 2007
Messages
24,344
I think I remember casadejohnson having that happen a few years back.
 

Madgyver

Contributor
Bronco Madman
Joined
Jul 30, 2001
Messages
14,903
I lost a wheel earlier this year while driving with slots, Those mag lugs only gave me problems so I sold the slots for $100. set of 4. Good riddence...
 
OP
OP
R

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,127
i use shank style nuts

the MCgard 6200 are the shank style
http://www.mcgard.com/Applications/AutomotiveSearch/default.aspx?QToK=PuHw8KxyvAaxOdPC860ucQ==

when I ordered them I measured the thickness of the wheel and ordered the size it suggested.

I check lugs all the time before they are / were tight the one broke when i was tightening it almost no torque applied just broke using a ratchet, i never use an impact installing them.

also when installing I tightened them in steps.

I would like to change the shank style to taper but can't find anyone to do it locally.
 

bmc69

Contributor
Bronco Guru
Joined
Jun 11, 2004
Messages
11,914
You piss someone off maybe Randy? Better inspect all your brake lines too. :D
 

Apogee

Contributor
Bronco Guru
Joined
Nov 26, 2005
Messages
6,189
What did you torque your studs to and what type of torque wrench? Did you install the nuts dry or did you lube them with anti-seize or any other lubricant?

I've lost a wheel once on my F150...apparently I torqued 3 out of 4 wheels and can't reliably count higher than that. The loose wheel made it about 2 hours up the freeway until I had to choose between hitting a pothole with the truck or the 8x12 trailer I was pulling...I chose the truck and it was a bad choice. Not two minutes later, I had a weird vibration whenever I lifted off the gas which turned into a massive vibration in the 30 seconds it took to get safely to the shoulder. I got it stopped, walked around the rig and there was a pile of aluminum shavings in the left rear wheel and two lug nuts clinging to half a thread each, one of which fell off in my hand when I touched it. Three lug nuts were missing, along with the wheel studs.
 
OP
OP
R

ransil

Bronco Guru
Joined
Sep 6, 2003
Messages
8,127
What did you torque your studs to and what type of torque wrench? Did you install the nuts dry or did you lube them with anti-seize or any other lubricant?

I've lost a wheel once on my F150...apparently I torqued 3 out of 4 wheels and can't reliably count higher than that. The loose wheel made it about 2 hours up the freeway until I had to choose between hitting a pothole with the truck or the 8x12 trailer I was pulling...I chose the truck and it was a bad choice. Not two minutes later, I had a weird vibration whenever I lifted off the gas which turned into a massive vibration in the 30 seconds it took to get safely to the shoulder. I got it stopped, walked around the rig and there was a pile of aluminum shavings in the left rear wheel and two lug nuts clinging to half a thread each, one of which fell off in my hand when I touched it. Three lug nuts were missing, along with the wheel studs.


Didn't use a torque wrench just a ratchet or breaker bar. They were all tight, I did not miss a wheel. these were on for 2 years and I have checked them multiple times.
I'm sure I used anti seize I used it on everything.

I'm familiar with what happens with loose lug nuts looks like 2 hours is the max distance for them to fall off as I did the same thing on my trailer a few years ago and it broke all the studs and egged out the rim, so after that incident I'm pretty consistent on checking lug nut tightness on everything I own before a trip.
 

Apogee

Contributor
Bronco Guru
Joined
Nov 26, 2005
Messages
6,189
Didn't use a torque wrench just a ratchet or breaker bar. They were all tight, I did not miss a wheel. these were on for 2 years and I have checked them multiple times.
I'm sure I used anti seize I used it on everything.

I'm familiar with what happens with loose lug nuts looks like 2 hours is the max distance for them to fall off as I did the same thing on my trailer a few years ago and it broke all the studs and egged out the rim, so after that incident I'm pretty consistent on checking lug nut tightness on everything I own before a trip.

Use of anti-seize or any other thread lubricant means that when you tighten the lug nut, you're getting more stretch per ft-lb of torque. The amount varies depending on the wheel stud finish and condition, but +10% seems to be a pretty good estimate, so you should be de-rating the wheel stud torque spec by that amount. Since you're not using a torque wrench, that would be the obvious suggestion to avoid having this happening again in the future, or at least have more information should it repeat.

I've seen a few guys who just "oomph" their lug studs and had the opportunity to check with a torque wrench afterwards...most were big boys and were over tightening by 20% to 30%.

I know what you mean about checking wheel studs...I'm a bit OCD about it now.
 
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