Re: another grease question: bolt threads

> I also wonder what the "wiggle room" is for the Honda torque specs. As
> you note, they specify a single value while others specify a range. How
> close to max supported torque are those specs? Probably only a Honda
> engineer would know.

....
> I can supply you with some, as applied to automatic transmissions:
>
> 1.2 Kgf-m +/- 0.2
> 1.4 Kgf-m +/- 0.2
> 1.75 Kgf-m +/- 0.25
> 2.0 Kgf-m +/- 0.2
> 2.2 Kgf-m +/- 0.2
> 2.7 Kgf-m +/- 0.3
> 3.1 Kgf-m +/- 0.4
> 5.0 Kgf-m +/- 0.5
> 5.5 Kgf-m +/- 0.5
> 6.5 Kgf-m +/- 0.5
> 10.25 Kgf-m +/- 0.25 Steel
>
> Note that these are transmission specs, probably taken from HES (Honda
> Engineering Standards). All are for Honda (unspecified grade) steel bolts
> into aluminum threads except where otherwise noted. These may or may not
> apply to other applications for Honda and are meant to serve as guidelines
> only. Unfortunately, I can't convert these to SAE specs, or into N-m.
> Also, my $0.02 worth regarding torque of lubricated bolts.....
> Oil or grease on your bolt will play havoc with accuracy of final torque.
It
> affects stretch as well. Many times have I seen steel bolts break off in
> aluminum threads because our bolts had oil on them. How much is too much;
I
> couldn't say.
> Doc

> "Abeness" <news@nada.x> wrote in message
> news:icSdnfUc2cr02wHcRVn-3g@rcn.net...
> > Caroline wrote:
> > > The distinction I was attempting to draw is that this problem
> > > of overtorquing spark plugs arguably is related to the fact that the
> spark
> > > plug threads are brand new, never been used.
> >
> > And because they have been precoated, acc. to the GM quote, presumably
> > with a lubricant since the quote goes on to refer to the antiseize
> > compound as "added insurance". I don't know that other types of new
> > bolts are precoated. But I really know very little about bolts and
> > threads...
> >
> > > Here (to be a total ass), but I flubbed this one.
> >
> > Mistakes happen, few admit them. No "total asshood" witnessed here. I
> > should've specified "bolt torque expert". ;-))
> >
> > > to a site where someone had a lab that could measure bolt tension (not
> for
> > > the DIYer) and actually did some tests on bolts with and without lube.
> >
> > Could you post the link? I'd be interested in seeing it myself.
> >
> > > I suspect dealer and independent shop technicians do the same. Torque
> > > wrenches are rarely broken out. Yet cars get repaired, and only once
in
> a
> > > while does one here of a bolt not properly tightened.
> >
> > Yeah. I've tightened lots of bolts in my day, never used a torque
> > wrench, and rarely had a problem. I bought a torque wrench for my Honda
> > work because the aluminum block makes me nervous (had nice solid
> > gas-guzzling steel blocks previously)--I expect the "feel" will have to
> > be relearned for aluminum, so I'll go easy at first.
> >
> > I also wonder what the "wiggle room" is for the Honda torque specs. As
> > you note, they specify a single value while others specify a range. How
> > close to max supported torque are those specs? Probably only a Honda
> > engineer would know.
>
>