Over torqued lbj bolts

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dozerfrelich

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My friend helped me install new lbjs and mistakingly torqued them to 112 ft ibs. None of them snapped so I'm inclined to leave them or should I replace them. The bolts were new


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dozerfrelich said:
My friend helped me install new lbjs and mistakingly torqued them to 112 ft ibs. None of them snapped so I'm inclined to leave them or should I replace them. The bolts were new


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Supposed to be 59 foot pounds and went almost double? Tough call. I'd remove one and measure stretch against a new bolt

Or for about $20 you can replace them all for piece of mind
 
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That's a lot of extra torque... I'd be worried the threads in the spindle got damaged at that point.
 
Unner said:
That's a lot of extra torque... I'd be worried the threads in the spindle got damaged at that point.
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Agreed, but while those bolts are hard, but those spindles are harder

I would measure the stretch on a pulled bolt compared to a freshie and then see if the freshie runs into the spindle by hand or if it binds up
 
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Unner said:
That's a lot of extra torque... I'd be worried the threads in the spindle got damaged at that point.
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Exactly. I'm very surprised the heads didn't shear off.

Are you sure that wasn't the torque applied to the castle nut? If so then you'd be OK.
 
He is used to working on GM vehicles so when I wrote all the torq. Specs he got confused as what LBJ to LCA meant. It wasn't until he went to torq down the 4 bolts did he realize that the castle nut is 112 ft. Lbs haha. I'm surprised that the bolts didn't snap either! I'll pull one of the bolts to measure tomorrow after work and see if it stretched it or not. I'm sure that the spindle threads are fine. They would have giving out around 80-90 if they were weaker.


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dozerfrelich said:
I'm sure that the spindle threads are fine. They would have giving out around 80-90 if they were weaker.
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Lol. That's some wishful thinking. They could give out at 114. There's a torque spec for a reason. Toyota's engineers get paid a lot of money to figure this stuff out. And you can bet they test them to failure. The question is what's that mean failure number?
 
Go ahead and gamble with your life...and the lives of those in your truck...and the lives of everyone else that share the road with you as well...like the school bus full kids that drives by your place everyday.

Saving $20 and hour of time is what really matters. You only live once – so enjoy that extra hour you saved...until you roll your truck on the freeway and wedge yourself under the wheels of a semi hauling 40,000lbs of rubber dog-shit outta Chinatown.

Dramatic yes – but that's the best way to drive home a point.

I don't know man, you roll the dice and you take your chances. If it were me, every high-speed mountain curve – I'd be thinking about if I'd made a bad choice in not replacing those damn bolts...
 
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I have a bent spindle laying around I'm gonna test in the next couple of days to see how much it takes and see what fails first. If the threads on spindle give out close to 130 then I'm going to swap the spindle out. Its on my third runner which only goes into town (pop. 500) which is 15 miles or so during hunting season so I'm not to worried about having it fail and cause a horrendous crash. I don't think I've ever had it past 50 since I've owned it.


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Because if I stressed the spindle to much then replacing the bolts won't help because the threads will rip out of the spindle.


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I'd replace the bolts anyway. The threads are deep on the spindle, and only the first three threads bear the load. Run a tap through the holes and then install new bolts.
 
Got around to testing it yesterday. 3 of the bolts were stretched .01~.015 and the 4th was about.005. I tested them on my bent spindle and the bolts snapped around 150~ ft. Ibs. The threads on the spindle didn’t seem to be damaged at all. I ran a new bolt through it and it threaded in easy and didn’t have any play in it so I’d say the spindle hardness is far greater then the bolts.


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dozerfrelich said:
Got around to testing it yesterday. 3 of the bolts were stretched .01~.015 and the 4th was about.005. I tested them on my bent spindle and the bolts snapped around 150~ ft. Ibs. The threads on the spindle didn’t seem to be damaged at all. I ran a new bolt through it and it threaded in easy and didn’t have any play in it so I’d say the spindle hardness is far greater then the bolts.


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If I were an engineer and I were to design one part to fail before the other, it would be the part that is easily replaced; the bolts.

So, you're gonna put new bolts on and torque to 67 pounds feet?
 
Just my .02, I was wheeling with my 04 4Runner and the UBJ failed a couple miles from the trailhead...whoever had worked on the uppers last had overtorqued the nut and the threads sheared right off. Not a fun recovery.
 
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