FJ40 4 wheel studs sheered off??? (1 Viewer)

[Trippster]

What would cause 4 whee studs to sheer?

FJ40
410 gear
1 1/2 inch spacer
Running 33’s
right rear only. Left rear is fine…no issues
disk brake conversion

 

[charliemeyer007]

Poor heat treatment of crappy steel comes to mind. Chinanezium. Big impact rattle gun can ruin about anything. Use the lowest setting to run them up, then a good torque wrench to spec.

 

[South Texas 97]

They are “Stuck” to the lug nuts. Which might indicate they rusted to the studs? Might be worth taking them apart to see why they got stuck.
I don’t use an impact at all on lug nuts.
I think OEM are available from Toyota replace them all, both sides. Cheap insurance

this thread has a good discussion

 

[aztoyman]

The fracture faces look like there is beach marks which is indicative of fatigue fractures. I don't know the cause of the initial fracture. Since you still have the pieces, I'm guessing that they broke off while you were removing them?

Hard to tell in the pics but one looks like a brittle fracture. More sudden failure. Maybe siezed to the lug nut like mentioned. Over torque like mentioned?

 

[Trippster]

I’m sorry I should’ve been more clear

This happened on the highway doing 45mph

 

[aztoyman]

That's scary.

 

[aztoyman]

The brake rotor looks rusty or like it was hot too? The color is off but it could just be the pic. I would think it would be more shiny.

 

[Trippster]

I’m at 4 wheel parts. It turns out it was my faul. I didn’t recheck torques and no locktiight anywhere


oooops. My bad

 

[Trippster]

Thank you all for the information

I got lucky…….check your spacers folks!!!!

Ben

 

[B y r o n]

I know you've probably heard this before, but look into wheel options where you don't have to use spacers. What you just experienced is why not to use them unless there is no other option.