Go Back   AudiWorld Forums > Audi Models > Audi A8 / S8 > A8 / S8 (D3 Platform) Discussion
Sign in using an external account
Register Forgot Password?


A8 / S8 (D3 Platform) Discussion Discussion forum for the D3 Audi A8 produced from 2003-2010 and Audi S8 produced from 2006-2010

Welcome to AudiWorld Forums!
Welcome to AudiWorld.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the AudiWorld Forums community today!


Reply
 
 
 
 
LinkBack Thread Tools Search this Thread Display Modes
Old 08-02-2014, 05:02 PM   #1
Audiworld Junior Member
Account #: 287903
 
Join Date: Aug 2014
Posts: 16
Default Capped tube near oil filter - V10 5.2L engine

There is a tube with a cap on it near the oil filter on my 2007 S8. It comes up from behind the engine and loosely sits between the oil filter and EVAP valve. The tube has a black cap that is easily pulled off like a plug. There was no fluid at the bottom of the cap or on the inside of the tube, it's dry and looks empty.

Does anyone know what the purpose of this tube is?
Bart247 is offline   Reply With Quote
Old 08-02-2014, 09:12 PM   #2
AudiWorld Super User
Account #: 195381
 
mishar's Avatar
 
Join Date: Nov 2010
Location: Vancouver, Canada
Posts: 5,094
Default

As far as I remember all S8's have that tube, but I am not sure that anybody knows its function. Could be just Art of Engineering.
mishar is offline   Reply With Quote
Old 08-03-2014, 06:17 AM   #3
AudiWorld Super User
Account #: 102428
 
Mister Bally's Avatar
 
Join Date: Jan 2006
Posts: 3,173
Default

Any chance that it is connected to the exhaust manifold? My older '87 and below Audi's and VW's had something like this to measure CO ahead of the catalytic convertors. The tube was stainless and the cap was Teflon though as the tube got warm and the gas was hotter than hell.
Mister Bally is offline   Reply With Quote
Old 08-03-2014, 07:34 AM   #4
Audiworld Junior Member
Account #: 287903
 
Join Date: Aug 2014
Posts: 16
Default

I went through my repair manual and the best match I could find is the Transmission ventilation hose.

The cap at the end of this hose popped off very easily. The problem is I dropped it and it fell behind the engine. I took off the plastic belly pan under the car hoping it made it all the way down and landed there, but no luck. I tried my endoscope but it's hard to get far angles with such a tightly packed engine.

For the brief moment I held the cap it looked like the bottom had some vents and the fact that it wasn't on so tight leads me to believe that it may vent some gas.

What do you suggest I do? seal it closed temporarily until I get a replacement cap or leave it open?
Attached Images
File Type: jpg vent_hose.jpg (49.7 KB, 33 views)
Bart247 is offline   Reply With Quote
Old 08-03-2014, 07:50 AM   #5
Audiworld Junior Member
Account #: 287903
 
Join Date: Aug 2014
Posts: 16
Default

I found the cap

It's called a Automatic Transmission Dust Cap.

VW Skoda Aodiming Rui Hao Sagitar Maitengpasate Automatic Transmission Vent Hose Dust Caps-in Other Transmission System Accessories from Car / Products / Accessories / Modifications on ChinaOntrade.com
Bart247 is offline   Reply With Quote
Old 08-03-2014, 08:04 AM   #6
Senior Member
Account #: 26081
 
Join Date: Oct 2001
Posts: 6,071
Default Makes sense

Back on really old ZF trannies I removed from Audis, there would be an air vent at the top of the transmission case. It would have a small metal cover crimped on to it that you could move to the touch. Of course, this was also in the days of dipstick based check and fill systems and three speeds.

This sounds like the same thing, other than they have put an extension hose onto it for some reason. Maybe it is either to get it a bit further away from the heat that would be back there w/ the exhaust just above, and/or to get the air outlet effectively higher up if the car were ever even momentarily submerged up to the level of the transmission tail. The cover is presumably to minimize dust ingress, or water or other stuff getting sprayed int it somehow from above.
__________________
Current #1: '06 D3 A8L W12 brilliant black w/ amaretto; 4 seat setup, CPO; modestly lowered, H&R 20mm rear and 12mm front DRs with 275/35 on OEM polished + forged 20's; S8 sway bars (see: rear bar and gen'l D3 bar info and front bar); tweaked 385mm front factory brake mod and matching rear brake mod; matching C6 A6 back headrests (better rear view: headrest tweak); owner installed AMI retrofit with part number details here.
Current #2: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery 7/2013 (pictured at Ingolstadt)
Prior (each modded): 2000 C5 A6 4.2 & '96 C4 A6 2.8Q, both still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS

helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

MP4.2+6.0 is online now   Reply With Quote
Old 08-03-2014, 08:09 AM   #7
Audiworld Junior Member
Account #: 287903
 
Join Date: Aug 2014
Posts: 16
Default

Should I leave it open until I get a replacement cap, or cover it?
Bart247 is offline   Reply With Quote
Old 08-03-2014, 08:27 AM   #8
Senior Member
Account #: 26081
 
Join Date: Oct 2001
Posts: 6,071
Default In short term, probably little chance of an issue...

I would not plug it up, but if you want to you could do something like simply folding over a piece of duct tape loosely over the end but where it is still not fully sealed up.
__________________
Current #1: '06 D3 A8L W12 brilliant black w/ amaretto; 4 seat setup, CPO; modestly lowered, H&R 20mm rear and 12mm front DRs with 275/35 on OEM polished + forged 20's; S8 sway bars (see: rear bar and gen'l D3 bar info and front bar); tweaked 385mm front factory brake mod and matching rear brake mod; matching C6 A6 back headrests (better rear view: headrest tweak); owner installed AMI retrofit with part number details here.
Current #2: 2013 Q5 2.0T hybrid; Scuba blue w/ chestnut sport interior; Euro delivery 7/2013 (pictured at Ingolstadt)
Prior (each modded): 2000 C5 A6 4.2 & '96 C4 A6 2.8Q, both still w/ family; '85 C3 5000S 5 sp FWD; '73 C1 100LS

helpful cross reference to a C6 post with MMI and other TSB's that also cover D3 A8's.

MP4.2+6.0 is online now   Reply With Quote
Old 08-03-2014, 08:55 AM   #9
Audiworld Junior Member
Account #: 287903
 
Join Date: Aug 2014
Posts: 16
Default

I'll do the duct tape.

Thanks.
Bart247 is offline   Reply With Quote
Old 08-03-2014, 08:55 AM
AudiWorld
Audi R8




Paid Advertisement
 
 
 
Reply

Tags
filter, oil, tube


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 07:27 PM.


Copyright 2014 AudiWorld.com Audi Enthusiast Community