Help! S8 Scary Engine Noise...Worried

[Goran]

Originally Posted by steamship

Could it possibly be the engine block breather valve giving up the ghost?

I think you're onto something there! perhaps the rubber diaphragm has failed and is vibrating as it lets air out?

Its the black plastic UFO type object at the back of the engine.

Here it is in a picture I borrowed from another forum member's post as it shows the engine bay without covers.

It is easy to remove by jubilee clip or the Audi type clip, but I'm not sure if its safe to run the engine without it or with the rubber hose plugged to test if the noise stops?
Probably ok for a minute or two, as its just a sprung rubber diaphragm to let some crankcase pressure out when it builds up enough to be able to open the diaphragm.

This is how it looks inside:

http://forums.quattroworld.com/a8/threads/8649.phtml

[HPsauce]

Having had mine off it's held by Clic-R collars/clamps which are best removed/replaced with specialist pliers.

[mark_le_b]

Originally Posted by Goran

I think you're onto something there! perhaps the rubber diaphragm has failed and is vibrating as it lets air out?

Its the black plastic UFO type object at the back of the engine.

Here it is in a picture I borrowed from another forum member's post as it shows the engine bay without covers.

It is easy to remove by jubilee clip or the Audi type clip, but I'm not sure if its safe to run the engine without it or with the rubber hose plugged to test if the noise stops?
Probably ok for a minute or two, as its just a sprung rubber diaphragm to let some crankcase pressure out when it builds up enough to be able to open the diaphragm.

This is how it looks inside:

http://forums.quattroworld.com/a8/threads/8649.phtml

Thank you, I have the plastic covers off the engine, so have seen this
Will run car to see if this is the culprit
Appreciate the ideas

[mark_le_b]

Originally Posted by Goran

I think you're onto something there! perhaps the rubber diaphragm has failed and is vibrating as it lets air out?

Its the black plastic UFO type object at the back of the engine.

Here it is in a picture I borrowed from another forum member's post as it shows the engine bay without covers.

It is easy to remove by jubilee clip or the Audi type clip, but I'm not sure if its safe to run the engine without it or with the rubber hose plugged to test if the noise stops?
Probably ok for a minute or two, as its just a sprung rubber diaphragm to let some crankcase pressure out when it builds up enough to be able to open the diaphragm.

This is how it looks inside:

http://forums.quattroworld.com/a8/threads/8649.phtml

Eureka! This is the problem, found this was the noise this afternoon
Can anybody help with a part number so I can order a new one
I assume its easy enough to change over
Thanks

[steamship]

Originally Posted by mark_le_b

Eureka! This is the problem, found this was the noise this afternoon
Can anybody help with a part number so I can order a new one
I assume its easy enough to change over
Thanks

The part number is 077103245B. As for fitting, it is held in place by two clips. I had mine replaced a little while back and just used bog standard Jubilee clips instead of the OEM type used by Audi.

[mark_le_b]

Originally Posted by steamship

The part number is 077103245B. As for fitting, it is held in place by two clips. I had mine replaced a little while back and just used bog standard Jubilee clips instead of the OEM type used by Audi.

Great - thank you

[Goran]

Originally Posted by mark_le_b

Eureka! This is the problem, found this was the noise this afternoon
Can anybody help with a part number so I can order a new one
I assume its easy enough to change over
Thanks

Excellent! That's a easy fix.
If you end up needing a new one I think it is part no. 077103245B
for a 2001 S8. I think I paid the dealer around £100.

Its probably making a noise because the orange rubber diaphragm has split or fallen apart, but worth checking anyway just in case it just needs some cleaning.

[HPsauce]

Originally Posted by Goran

I think I paid the dealer around £100.

I think Mark has already ordered one, but I got one from the USA for the princely sum of £27 including shipping!

[mark_le_b]

Originally Posted by HPsauce

I think Mark has already ordered one, but I got one from the USA for the princely sum of £27 including shipping!

I have ordered one - but because I was in a bit of a hurry I went with the dealer - cost £67 but it will be here Thursday,so I an fit at the week-end

[Goran]

Originally Posted by HPsauce

I think Mark has already ordered one, but I got one from the USA for the princely sum of £27 including shipping!

Ah, should have read more carefully.
Was the USA one an Audi original part, or if not, is it working fine?
I'll be needing another one for the current S8, no harm in saving some money