Broken Wheel Bolts
cord4530 at uidaho.edu
Thu Jan 27 19:45:10 EST 2005
> Anybody faced this before:
> http://www.pbase.com/kneale_brownson/image/39122017 Those holes you can't
> see through have broken-off ends of wheel bolts in them. The broken bolts
> are at http://www.pbase.com/kneale_brownson/image/39121870
Bummer Kneale! There's many ways to extract broken bolts. Some are
better than others, but they all depend on what you have available.
You mentioned screw extractors. Those may be okay, and the larger the
better. You don't have to be super precise about being on center, but if
you end up drilling/tapping, you'd be happier if you were. If you have
access to some heat (even a propane torch), do heat the area around the
threads to help it expand.
Also, (I'm not looking at my car now, so I could be wrong) you should
have the option to thread the bolts through the hub (as opposed to
pulling them out the way they came in). I don't know if either will have
an advantage in this case.
Other options may be:
If there's enough thread exposed on the back, locktite a nut (correct
thread diameter and pitch) on the back side and use that to thread through.
Weld a nut to the center of the stud, and use a regular wrench to pull
Use an impact screwdriver to help break it loose.
Pull the hub off and find a replacement (expensive, but you can replace
the bearing while you're there...)
I'm sure there's more options as well.
As to why they broke....I don't know. Actually, looking at the failure,
it appears that there's a fair amount of material that was broken (rust
colored) prior to the final break (clean part). It looks like a crack
started some time ago, and has been propagating inward. Perhaps 5 years
ago they were torqued (or untorqued) pretty harshly?
Still, there was a lot of material left on the clean break surface.
Probably had to hit some pot hole (or equivalent) pretty well to break
the remaining area. Perhaps it may not be a bad idea to inspect the
other bolts and replace any that seem questionable.
Wish I had more useful info to share-
University of Idaho - Engine Research Facility
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