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Is this a potential MAJOR FAIL with PO installed spacers??

cdvcj8

cdvcj8

It's Not My Scrambler
Lifetime Member
City
West Friendship
State
MD
So, took the wheels off for the first time while working on the brakes. I found this:

IMG_1625.JPG

From measuring I appears that there are about 8 threads of the bolt on the wheel stud. It's worked fine for two years, but I don't want it to suddenly explode on me.

Is this sufficient? Should I get slightly bigger studs?

I found an interesting thread that says that there is very little structural value after the first 6 threads:

http://www.practicalmachinist.com/vb/general/thread-strength-vs-percent-thread-vs-depth-173689/
 
I wouldn't want to have it that way, but I'm no engineer.
 
There are some engineering rules for amount of engagement. I learned them and school but can't remember. It wouldn't take long to punch those studs out and put new ones in. Also locktite is recommended on those wheel adaptors.
 
I would think if nut was designed with that many threads they should be full. I wouldn't trust that unless one or two threads on the stud were showing.
 
I think the saying "if it looks right...., it probably is" applies here and that doesn't look right to me.

For the cheap cost of some new longer wheel studs i would just get them swapped, because i know if it were me i would be worrying about that every time i drove it.
 
Four fully engaged threads is the engineering rule I was brought up on during my apprenticeship. Having said that that looks Bleh!!
 
If I couldnt get an entire nuts worth of thread I would not have run those adapters. Or at leat 3/4 the width of the stud. Looks like its a 1/4 of the depth. Did they even have locktite on them?
 
gazzo said:
Four fully engaged threads is the engineering rule I was brought up on during my apprenticeship. Having said that that looks Bleh!!
Click to expand...

I thought is was at least 1 diameter(of the bolt/screw) of thread engagement.
 
mysunnshine said:
I thought is was at least 1 diameter(of the bolt/screw) of thread engagement.
Click to expand...

That rule was also mentioned in the thread I attached. It said 1X for steel and 3X for aluminum. So, I think I pass both criteria.

I don't remember seeing an evidence of threadlocker, but I will look closer next time I have it off.


Thanks for all the input. Science and the fact it's worked for two years tells me it's probably okay to go between my house and the golf course. However, I'm with Jim. Kind of gave me a queasy feeling. I'm going to give it a go. My biggest problem is this is an old plow jeep from Michigan and this isn't one of those car shows where this kind of project goes easy. Probably why the PO didn't bother. I'm sensing hammers and heat and my future. May spiral into me taking the whole thing apart and making it shiny.

I guess the first task is to jump into the Google pool to try to figure out the stud length I need and a suitable replacement. Unless someone knows of a source for .5 inch longer studs for Dana 30 axles with disc brakes??
 
cdvcj8 said:
So, took the wheels off for the first time while working on the brakes. I found this:

View attachment 48044

From measuring I appears that there are about 8 threads of the bolt on the wheel stud. It's worked fine for two years, but I don't want it to suddenly explode on me.

Is this sufficient? Should I get slightly bigger studs?

I found an interesting thread that says that there is very little structural value after the first 6 threads:

http://www.practicalmachinist.com/vb/general/thread-strength-vs-percent-thread-vs-depth-173689/
Click to expand...

Out of curiosity are you able to tell what brand they are? I'm looking to put some spacers on and want to make sure I avoid this situation if I can.
 
I have a stack of receipts and I can check Saturday when I get home. However, I think it's more a case of the size of the spacer. I "believe" it's standard procedure to replace the stock wheel studs if the spacer is too big.


 
Those are Spidertrax spacers most likely, only ones i'v ever seen in that color. Generally considered the best available.

I had insufficient coverage on a set also, NAPA carries HD studs in most lengths which i replaced mine with.
 
The rule of thumb that I was taught in my industrial career was at least 2 threads past the end of the nut.
 
looks as thought you have enough thread for the wheels so if the spacer falls off at least you'll still have them attached to the wheel!
 
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