Airbags, dry-rot

[timvasqz]

I dont think the bags on our bus are a bag in a bag its just one bag.
The cover inside and outside are the protective rubber keeping the
chords from the elements. Every rally I attend all you see are old
bags, something should be done. Even the description below is
confusing because ;a fabric is woven and ;bias is orientation at an
angel. if a fabric is situated on a bias , the angle is repeated
every 90deg. how could you arrange the second fabric on an oppisite
angle?

I need to go to a junk yard with a knife and check this out

http://www.airsprings.com.au/Airide_Definitions.cfm

Greg ofTim&Greg


--- In WanderlodgeForum@yahoogroups.com, david brady
wrote:
>
> As other's have pointed out, there does appear to be an inner liner
> built into today's air springs. I copied this following from
Firestone's
> "Airide Design Guide":
>
> "An air spring is a carefully designed rubber and fabric flexible
member
> which contains a column of compressed air. The flexible member
itself
> does not provide force or support load; these functions are
performed
> by the column of air. Firestone air springs are highly engineered
> elastomeric
> flexible members with specifically designed metal end closures. The
> standard two-ply version is made up of four layers:
>
> (1) Inner Liner. An inner liner of calendered rubber.
> (2) Frst Ply. One ply of fabric reinforced rubber with the cords
> at a specific bias angle.
> (3) Second Ply. A second ply of fabric reinforced rubber with the
same bias
> angle laid opposite that of the first ply.
> (4) Outer Cover. An outer cover of calendered rubber."
>
> David Brady
> '02 LXi, NC
>
>
> Pete Masterson wrote:
> >
> > I note that I've twice had competent service providers "carefully
> > inspect" the condition of my coach, and neither have indicated
any
> > concern about the air bags. They don't look horrible, but do have
some
> > checking and cracks on the outside. I take it that it's normal
for the
> > age of the bags.
> >
> >
> > While I have no way of knowing (I'm at least the 3rd owner of
this
> > coach), I doubt that any of the POs had the air bags replaced.
The
> > immediate PO never mentioned air bags, and the (incomplete) set
of
> > receipts he provided don't mention them either.
> >
> > Pete Masterson
> > '95 Blue Bird Wanderlodge WBDA 42 (For Sale)
> > <http://www.aeonix.biz/BBforsale.html
> > <http://www.aeonix.biz/BBforsale.html>>
> > El Sobrante CA
> > aeonix1@...
> >
> >
> >
> >
> > On Feb 28, 2009, at 10:57 AM, Wayne Kotila wrote:
> >
> >> David, I have a 1985 PT40 that I have owned for 12 years and the
air
> >> bags have looked that way as long as I have owned it. When I
bought
> >> the coach 12 years ago it had about 100,000 miles on it, now it
has
> >> about 160,000. I am not shure but I wonder if the bags have a
thick
> >> outer protective layer that we see cracking on the outside and
the
> >> actual bag sealing the air is a thinner more plyable rubber on
the
> >> inside?
> >> Wayne
> >>
> >> -----------------------------------------------------------------
-------
> >> *From:* david brady >
> >> *To:* WanderlodgeForum@yahoogroups.com
> >>
> >> *Sent:* Friday, February 27, 2009 11:37:06 AM
> >> *Subject:* [WanderlodgeForum] Airbags, dry-rot
> >>
> >> I was inspecting the coach the other day and noticed
> >> that all my airbags are checked and cracked, similar
> >> to the appearance of a dry-rotted tire. The bags are
> >> 7.5 years old. Anyone have a feel for how long bags
> >> should last, and how severely checked they can become
> >> before replacement is necessary? I have visions of
> >> installing new bags only to find the same checkng one
> >> year from now.
> >>
> >> (Planning a cross country trip and want to be prepared).
> >>
> >> David Brady
> >> '02 LXi, NC
> >>
> >
> >
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