Completely sheered an axle-side rear driveshaft bolt - JeepForum.com
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Unread 10-01-2014, 06:13 AM   #1
solomon8718
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Completely sheered an axle-side rear driveshaft bolt

Not sure why this happened - I ended up stranded yesterday and having to get a tow. I tightened the bolts as tight as I could when I installed it and used thread locker. Any of you able to shed some light on this? Hopefully Ill be able to recover the driveshaft.

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Last edited by solomon8718; 10-01-2014 at 06:15 AM.. Reason: Rotated images
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Unread 10-01-2014, 07:10 AM   #2
zjosh93
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You may have overtightened the bolts if you tightened them as much as you could. They aren't very big and they are fine thread. The torque spec is pretty small.
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Unread 10-01-2014, 07:11 AM   #3
solomon8718
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Well, honestly tightening them as tight as I could wasn't exceptionally tight. I actually struggled tightening them while avoiding rounding out the heads.
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Unread 10-01-2014, 07:12 AM   #4
PolkaPower
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I'm going to say over tightened as well. Those are small bolts and don't require a bunch of torque to tighten. You can easily break the heads off of them over tightening as well. I did that once. Same goes for the brake caliper bolts.
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Unread 10-01-2014, 07:24 AM   #5
solomon8718
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So you guys are saying is I possibly weakened the bolt by over tightening?
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Unread 10-01-2014, 08:34 AM   #6
HighLonesome
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I was thinking the pinion angle was way off.
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Unread 10-01-2014, 08:40 AM   #7
PolkaPower
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If it was that bad wouldn't you notice it while you were driving? It would probably feel like when my front CV shaft bit the bullet.
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Unread 10-01-2014, 08:52 AM   #8
HighLonesome
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I reckon so.
I torque those bolts pretty tight and never had a problem.
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Unread 10-01-2014, 09:04 AM   #9
NTH
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IIRC, torque spec for those is approx. 14-20 lb/ft
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Unread 10-01-2014, 09:05 AM   #10
jlann
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I don't think it was over tightening. Over tightening that would take a CRAP ton of torque.. Which I don't think would be possible using regular tools (I assume you used). I'd go over all of the compromised components and look for stress fractures and strain marks. I am a construction project manager (took engineering classes for the degree on materials + stresses and strains) and believe me, I don't think you by yourself broke that from over tightening.. It happens rarely.. but not in this context.
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Unread 10-01-2014, 09:06 AM   #11
jlann
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Quote:
Originally Posted by HighLonesome View Post
I was thinking the pinion angle was way off.
This is my speculation as well ^
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Unread 10-01-2014, 10:00 AM   #12
zjosh93
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Quote:
Originally Posted by jlann View Post
I don't think it was over tightening. Over tightening that would take a CRAP ton of torque.. Which I don't think would be possible using regular tools (I assume you used). I'd go over all of the compromised components and look for stress fractures and strain marks. I am a construction project manager (took engineering classes for the degree on materials + stresses and strains) and believe me, I don't think you by yourself broke that from over tightening.. It happens rarely.. but not in this context.
The U-joint strap bolts are 1/4-28 thread. A quick look around at suggested torque values for that thread and the average is about 10-14 ft/lbs. I'm pretty sure most of us with regular tools can break that easily.
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Unread 10-01-2014, 10:11 AM   #13
solomon8718
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Quote:
Originally Posted by HighLonesome
I was thinking the pinion angle was way off.
Thinking back this may be it. I do recall a little vibration at higher speeds. And with the torque of the niner maybe even a small amount of pinion angle being off could rip that bolt apart especially if it was weakened over time.
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Unread 10-01-2014, 10:19 AM   #14
PolkaPower
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That is the front though. 90% of the power is to the rear until it slips. There is hardly anything going to the front. A little vibration would not constitute total failure. It would be a very apparent WHOMP WHOMP WHOMP and you would want to pull over immediately.
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Unread 10-01-2014, 10:20 AM   #15
solomon8718
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Quote:
Originally Posted by PolkaPower View Post
That is the front though. 90% of the power is to the rear until it slips. There is hardly anything going to the front. A little vibration would not constitute total failure. It would be a very apparent WHOMP WHOMP WHOMP and you would want to pull over immediately.
Well actually that is the rear drive-shaft that sheered off and it was in 2wd at the time (TC swap). There was no obvious issue until the shaft actually let loose which certainly caused a big whomp whomp whomp.

I would describe the vibration as a loud hum (maybe like a whum sound) mostly around 75+ miles an hour.
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