Vac System / Bellows Armatures

[ulfilias]

Hi there,

Was investigating a vac system fault

17819 - Secondary Air Injection System; Bank 2
P1411 - 002 - Insufficient Flow - MIL ON

And noticed that one of my vaccum bellows was disconnected. It seems the ball joint had pinged off. I've connected it back again, but it seems a bit sloppy.


Any suggestions ???

Oh and i just found this
http://forums.quattroworld.com/a8/msgs/44689.phtml





Its the right one of these two. Quite what they are called and how to get a new arm or pod ???

[briang9]

Some of us bought some of these from a member on here, I think it was Nollywood? maybe try sending him a PM to see if he has any left

[HPsauce]

Originally Posted by ulfilias

And noticed that one of my vaccum bellows was disconnected. It seems the ball joint had pinged off.

The question would have to be - why?
Check that the flaps actuated by these are moving freely. No point in replacing the actuator arm if the flap is stuck causing it to come off again or break.

[ulfilias]

HPsauce - I managed to move the bellows by hand without much effot. There was a bit of corosion on the metal bracket which is now lubed.

I've left the cover off so I can keep an eye on it. The ball joint clip thing seemed very easy to press on!

BTW are they the same as my old D2 FL S8 ones as I have a dead one of those arround which could be used for spares

[ulfilias]

Hi There,

The bellows, arm and linkage on the 40v FL S8 is identical as the my 4.2 D3 A8

Since it was two nuts to remove them whole and that reduced the chance of the ball linkage getting sloppy and gave me a chance to check what the flap was like it seemed the right way to go. The flap has a little resistance moving from one state to another, but was free with it. Seemed a positive movement rather than tottally loose (potentially broken) so i took that as a reasonable sign. I did put some lube in and worked it, same with cleaning up the old belows and the arms. Watching the engine now it's fitted and it moves corectly!

And as for the drive. WOW. I wasn't expecting much but it's really freed up the engine. I'd felt that despite on paper the 4.2 D3 being a touch better than the D2 FL S8 it was rather lackluster. It had power but it delivered it in a wafting ease, rather than any slam. A gentle grace despite a heavy foot.
That's changed it's much more pick a speed and you're there that I loved of my old beast. Back to accidentally breaking the speed limit on an overtake!

Looking at the quattrow world post, it was the bottom flap and due to the spring, it would have always been in the mid band mode which tallies with what i've noticed. A slightly odd way to design it since the majority of the time you are going to be lower than 3360rpm, so i'd have expected Stage one to be the default sprung setting!

Lee

[Nollywood]

For actuator link compatibility:

D2 S8 40V and D3 A8 4.2 V8 40V----same links (short) for dual-stage intake.

D2 A8 3.7 / 4.2 V8 40V and D3 A8 3.7 V8 40V----same links (long) for 3-stage intake.

Further useful information:

D2 S8 40V and D3 A8 4.2 V8 40V----dual-stage intke actuators operated by a single solenoid, T-piece splitter for both bellows.

D2 A8 3.7 / 4.2 V8 40V and D3 A8 3.7 V8 40V----3-stage intake actuators operated by 2 solenoids, 1 independent, the other with a T-piece.