60 series FF sheared stud...

[cruiseroutfit]

So, I walk out of the gas station to hop back in my Cruiser, and notice that I have a stud/conewasher/nut missing on my FF 60 series rear axle... I drive it back, check the remaining nuts, they are ALL tight...

dd113? Is this similar to your mishap?

Not too worried about it... this setup has 1500+ miles (almost all wheeling, or on the way to wheeling)... and I havn't checked the nuts since the day I assembled it (early this year)

What do you all think?

I can tell you that the stud didn't fail as result of shear stress, both because the other 5 studs are intact and the two alignment dowels are intact as well... also, the break on the stud doesn't look like a shear breakage patter (Mat. Sci. / MeEn Standards)...

So I am thinking one of the following happened:

1. The stud was OEM (20 years old)... it is possible that is has been stretched over the years and finally reached its limits, could have even had an existing crack from... I didn't look that close.

2. It physically hit something out on the trail... such as a rock... Not too sure, there is no evidence on the axle flange, rim, etc (but it is hard to tell as my rims/beadlocks are covered in rockrash)

 

[dd113]

Exactly what happened to me, at least to start. one stud went I assumed I hit a rock on the trail. Then the others loosened then a pin dissappeared then 2 more studs then it shot right out of the housing.

Is it the long side and what type of locker?

Gary C suggessted that overtightening the studs might cause part of this. I think they torque to 25 lbs or so. Sounds really low to me.

Another theory is that the auto locker puts extra strain on the LS and causes the studs to loosen.

I think that the pins wallow out the holes in the flange eventually allowing the flange to rock a bit eventually snapping the stud.

I posted on POR my present solution by adding 2 extra pins.
http://www.pirate4x4.com/forum/showthread.php?t=279110

 

[cruiseroutfit]

I run an ARB in the rear, and yes, it was the long side shaft...

I inspected my pins, without removing the axleshaft... they look tight (no wallowing on the flange, but possible on the hub)

Looks like I will pull the axle out after I get back from UROC this weekend.... I have literally had wheeling events every weekend for the past 6 months... No time for maintainance...

 

[bad_religion_au]

i'd replace them all... anyone i have ever spoken to about them said that once one goes, they all will start to fail... and for the overtightening thing as well is true... < good english. only set them snugly, and check them everyday for the first couple of weeks

 

[mustardfj40]

I am installing the chromoly studs into the rear of my FF axle, will let you guys how it goes. My concern is if these studs break it would be a pita to get them out of the hubs. For the front I replaced the old studs/nuts with new ones from Toyota preemptively, they're not too expensive.

/td

 

[cruiseroutfit]

I am installing the chromoly studs into the rear of my FF axle, will let you guys how it goes. My concern is if these studs break it would be a pita to get them out of the hubs. For the front I replaced the old studs/nuts with new ones from Toyota preemptively, they're not too expensive.

/td

I agree... when FROR started making the chromo kits, I was excited... Now I worry about getting broken studs out of the hub housings, and FF hub's arn't the easiest (and cheapest) thing to come by...

I have a pile of new OEM Toy ones sitting here... I think I will toss those on and call it good.

 

[CruisinGA]

I have literally had wheeling events every weekend for the past 6 months... No time for maintainance...

Here comes the violin............