UrS4 Strut pinch bolt size & Bira brake bracket interference

[Chris Talley]

I ordered the parts from the deal for  $ 2 a piece.

As far as outsourcing I thought there might be a better/higher
quality choice for the application, there are aerospace and other ultra high
quality automotive fasteners like ARP that offer the same specifications,
and usually have very good technical support and a premium price.

The design on the URS4 ball joint incorporates a groove to retain the ball
joint in case the fastener loosens.

Chris
.
On Thu, Jun 3, 2010 at 9:25 AM, <dgraber460 at aol.com> wrote:

> My reason for "qualifying" my remarks is evident.
> My experience is with the URQ struts, and the ball joint for them is
> grooved in such a way that if the bolt is the correct diameter and present,
> the joint cannot come out.
> I have seen a 928 loose a BJ while moving and agree it is _not_ an area to
> try to substitute or save money.
>
> Dennis
> Denver
>
>   -----Original Message-----
> From: Fred Munro <munrof at sympatico.ca>
> To: dgraber460 at aol.com; talleycm at gmail.com; quattro at audifans.com
> Sent: Thu, Jun 3, 2010 7:09 am
> Subject: RE: UrS4 Strut pinch bolt size & Bira brake bracket interference
>
> There have been a couple UrS listers who have had the ball joint drop out
> while the car has been in motion - one that I recall was at highway speed on
> an Interstate. This is guaranteed to ruin your entire day. From what I
> recall, in one case the improper bolt had been used. In the other case
> someone at the shop had pried open the slot in the strut housing to release
> the old ball joint when they were changing the control arm. The tool marks
> were still in the slot. This deforms the strut housing and it will never
> hold the ball joint again - the strut housing has to be replaced.
> This is not an area to fool around with if you don't know the engineering
> reasons for some of the design choices. The Bentley states an orientation
> for that bolt and there is a reason for that. They don't mention orientation
> for many other bolts. Retention of the bolt if the nut falls off is a good
> guess, but just having the bolt in the hole won't keep the ball joint in
> place. If that bolt loosens off the ball joint will pop out. My guess would
> be it has something to do with the way the clamping pressure is put on the
> strut housing. In any case, I'd recommend using the correct new bolt and nut
> each time it is loosened and orient it per the Bentley.
> Chris, removing the BIRA bracket is a PITA, but I'll guarantee it will be
> more of a PITA if the ball joint drops out while you are driving the car!
>
> JMHO
>
> Fred Munro
> '97 S6
>
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com <quattro-bounces at audifans.com?>] On
> Behalf Of dgraber460 at aol.com
> Sent: June 2, 2010 11:25 PM
> To: talleycm at gmail.com; quattro at audifans.com
> Subject: Re: UrS4 Strut pinch bolt size & Bira brake bracket interference
>
>
> My understanding (which is only hearsay, and my own assumptions) is that a
> grade 8 would be more than sufficient, and easily sourced.
> My other assumption is that it is head forward so that in the rare case the
> nut vibrates off, the bolt will be more likely to stay in place.
> Anyone with the true engineering "facts", feel free to chime in.
>
> Dennis
> Denver
>
>
>
> -----Original Message-----
> From: Chris Talley <talleycm at gmail.com>
> To: quattro at audifans.com
> Sent: Wed, Jun 2, 2010 9:35 am
> Subject: UrS4 Strut pinch bolt size & Bira brake bracket interference
>
>
> Hello All
> Is the strut/ball joint pinch bolt a off the shelf or a dealer only part.
> ither way does someone have a spec or a part number.
> I had to grind the head off to remove thebolt and strut, because the Bira
> racket for the BBK prevent easy extraction,  the Bentley indicates that the
> ead should point forward, with the brake bracket it the way that will be
> mpossible without removal of the bracket which I am relunctant to do. Why
> oes the bolt need to be instalelled in this direction and will it be a bad
> dea to install backwards to aid future removal.
> TIA,
> Chris
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