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Author: Subject: p****d off!!
corrado vr6

posted on 11/6/10 at 09:57 PM Reply With Quote
p****d off!!

Was showing off my build to a mate today, decided to take it for a spin on private land as not tested yet, and the lower wishbone ball joint lock nut failed which allowed the wishbone to drop down and the mounting bolts holding the ball joint to the wishbone then scored a nice groove on the inside of my wheel as the wheel was still turning arrrrgh!

Anyhow now ive calmed down and had a beer or three i thought id ask on here as to possible reasons or if its ever happend to anyone else, i know i had tightend the nut as i had just fitted my front arch brackets i know i used locktite and i used the supplied locknut, having looked at the nut i can see all the threads have been stripped as if the bolt has just been under so much pressure and just pushed its way out the threads. Could overtighening the nut have caused it to fail?

As you can imagine i think my mate was laughing on the inside





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madteg

posted on 11/6/10 at 10:04 PM Reply With Quote
Sound like it to me, better it failed now than when you are doing 100MPH.
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corrado vr6

posted on 11/6/10 at 10:06 PM Reply With Quote
quote:
Originally posted by madteg
Sound like it to me, better it failed now than when you are doing 100MPH.


exactly what i said at the time, puts me off driving it now incase anything else goes pop!





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AdrianH

posted on 11/6/10 at 10:09 PM Reply With Quote
I would have though possibly over tightend. Just done a Haynes check for the Sierra and got 48 to 63 lb ft torque setting.

I have not heard this type of failure before. Sorry but glad you OK.

Adrian

[Edited on 11-6-10 by AdrianH]





Why do I have to make the tools to finish the job? More time then money.

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daviep

posted on 12/6/10 at 12:54 AM Reply With Quote
Sounds strange normally it is very difficult to remove the ball joint from the upright once it has been tightened.

Are you sure you have the correct ball joint and correct nut?

Regards
Davie

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eznfrank

posted on 12/6/10 at 05:36 AM Reply With Quote
Had the nut been re-used a few times?
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cliftyhanger

posted on 12/6/10 at 06:40 AM Reply With Quote
Re-use wouldn't strip a thread, but may eventually cause it to lose the nyloc-iness and undo.
I suspect overtightening or if it is a repro part off ebay or somewhere a poor quality nut...

I would be inclined to change any similar supplied nuts, and maybe spend a few hours double checking the rest. Time that should re-assure you

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Stuart_B

posted on 12/6/10 at 06:48 AM Reply With Quote
sorry to here that greg.

possibly over tighten or a bad batch??

stuart





black mk indy, 1.6pinto on cbr600 bike carb's.

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designer

posted on 12/6/10 at 06:51 AM Reply With Quote
I've never heard of a nut failing, coming loose maybe, but failing!
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Mark G

posted on 12/6/10 at 08:08 AM Reply With Quote
Is that the taper on the hub that needs to be modified? If so, have you had your's done?
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mistergrumpy

posted on 12/6/10 at 08:36 AM Reply With Quote
I took the nut off and wheeled the car out of the garage without remembering and it happened. Nice big scrape on the inside of the wheel
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BenB

posted on 12/6/10 at 08:56 AM Reply With Quote
The nut on my top wishbone BJ fell off and I was a three wheeled car until I managed to pull over. I think I hadn't done that one up. A good trick is to get a Tippex marker pen and draw a line down the side of the BJ thread and nut. Then you can quickly do a visual check of all the nuts before you set off. That's what I do now anyway......
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40inches

posted on 12/6/10 at 08:57 AM Reply With Quote
quote:
Originally posted by Mark G
Is that the taper on the hub that needs to be modified? If so, have you had your's done?


+1

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austin man

posted on 12/6/10 at 09:34 AM Reply With Quote
I drilled mine and fitted a split pin as a secondary measure





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emsfactory

posted on 12/6/10 at 11:18 AM Reply With Quote
The girfriend had a tyre changed by a garage.
They had put the whell nuts on with an impact driver way too tight. When she hit a pothole, as she does quite regulary it ripped the threads off 2 of the 4 nuts.

Could be the same thing,
too tight and then a shock causing shear.

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Paul TigerB6

posted on 12/6/10 at 12:09 PM Reply With Quote
I'd think another potential cause of the stripped threads would be you've simply cross threaded it and tightened it up like that.
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corrado vr6

posted on 12/6/10 at 12:37 PM Reply With Quote
quote:
Could be the same thing,
too tight and then a shock causing shear.


I did hit a bump when it happend! There is also a possibility it was a cheap joint off eBay can't remember which side I replaced, I didn't think I cross threaded it but who knows. Obviosly I now need a new ball joint as although the threads on the bolt part look ok I don't trust it where would be a good place to get a new one that will be of good quality?





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Mark G

posted on 12/6/10 at 02:31 PM Reply With Quote
As long as you torque it up correctly any should be ok as the car weigh's so little and they're designed for much heavier loads.
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