Re: [DML] heli-coils in rear hub carrier

["tmpintnl" <tobyp@xxxx>]

Walt - Original threads on bolts MUST be rolled, or the durability is 
dramatically reduced. But, on internal threads such as what you have 
on the hub carrier, the threads can only be cut. If the hub carriers 
are made from aluminum, it is a good thing to have heli-coil inserts 
to protect the threads from galling during bolt installation. If you 
run a tap through the inserts to clean up the threads, and very little 
material is removed, you're probably just fine. In terms of using a 
die to clean threads on bolts, if a replacement bolt can be found 
easily, that's the best approach. If the bolt is hard to come by, 
cleaning up the threads is okay (to a degree) if the bolt is not 
loaded cyclically, and is loaded mostly in shear, which is the case 
with these particular application.

Toby Peterson VIN 2248
Winged1 

--- In dmcnews@xxxx, "Walter Coe" <Whalt@xxxx> wrote:
> Today I just noticed that one of the bolts that hold the caliper to 
the rear
> hub carrier had the threads damaged. Since there are two identical 
ones, I
> couldn't tell at first which heli-coil was responsible. So I ended 
up using
> a tap to chase the threads on both heli-coils. Barely any metal was
> removed. It is quite a job getting a tap in there. After reading 
about how
> Toby says that cut threads are not as strong as rolled threads, I 
figure
> that a heli-coil must be even worse. In light of this, I didn't 
re-thread
> the damaged bolt. I got another one from a junker.
> 
> I'm not asking a question with this post, really. I'm just saying 
that
> chasing the thread on a hub carrier heli-coil was needed and has 
been done.
> Does anyone think this is a bad thing to do?
> 
> Walt Tampa, FL
> 
> P.S. to Bill Buckner -- yes I know... tenacity! :)