3.0TDI V6 quattros prone to water pump failure and also prone to losing coolant from the water cooled EGR valve.

[s7gpt]

according to Honest John, not seen it posted here, any one aware of this etc ???

[Guest 2]

In the 4 years I've been on this site I haven't seen anything regarding to it tbh.




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[zollaf]

if honest john says so, then it must be true.
mind you, most of the drivel i have seen on that website is complete hogwash.

[s7gpt]

thanks for the reasurrance guys :)

[Pauls898]

Well I had a problem with my EGR valve, I was using water a pint every 300 miles, luckily it was sorted under the warranty, It turned out to be a crack in the EGR valve casting ;-(, took Audi three visits before they found the problem? I was convinced it was a cylinder head problem, luckily it wasn't.

[gupsterg]

Hi,


It turned out to be a crack in the EGR valve casting

Do you mean the cooling flap unit or cooler... as the EGR valve does not have coolant running through it...

BTW I'm not losing coolant just wanted to know for memory bank :) as have an A6 Avant V6 3.0 TDi (same engine/design)...

Regards
G

[Pauls898]

Hi gupsterg
The part which the Audi technician showed me looked to me like a small model steam engine boiler, there were lots of small holes where the exhaust gases past though, this was surrounded by a water jacket to cool it, it had two halves so for each bank of 3 cylinders gases to past though, the one half was all black and sooty the other side was all clear, i.e. steam cleaned by the water leaking and passing though clean it as it went. Once this part had been replaced the water usage stopped ;-) They said it was called the EGR Valve and on the V6 models, yes the water does pass through it to cool it down. Hope this helps.

[funavant]

Hi guys,
I've got an Audi A6 3.0 TDI Avant (58 reg) 70000 miles on the clock, and I am slowly loosing coolant liquid. Half a pint every 2000 miles. Yesterday I saw my friend, he is a car mechanic and runs his own garage. We spent a good 30min trying to localize the leak and finally he found coolant liquid deposits under the EGR. Difficult to see through all those pipes and hoses, but it was definitely there,collecting onto the passenger side bank. He could not localize the exact spot where the coolant was leaking from, and we didn't see any stream of coolant running. So he is going to get a new coolant pressure pump (his current one is broken), and then he will remove as many parts from the top of the engine as possible and try to localize the leak. As I I said, it is under the EGR and it is an external leak. He is betting on one of the EGR cooler hoses (fingers crossed) or it could be an oil cooler leak (small oil cooler sits between the banks, so I was told).
So wish me (and him) luck to find the culprit and post some suggestions if you have any.

I will keep you posted.

Martin

[robrob]

I think it is a known issue. I have a B8 2010 3.0TDI V6 and my water pump failed when 8 months old and about 14,000 miles. This was the thread about it at the time and Audi were well aware of it:

water pump failure (http://www.vwaudiforum.co.uk/forum/showthread.php?111466-water-pump-failure)

[funavant]

Hi guys, so I have an update to what seemed to be a EGR valve cooler leak.
As it turned out yesterday, it was actually a banjo bolt on the left (passenger) bank leaking, with coolant collecting under the EGR cooler. Hence the suspicion for EGR leak.
If you look at the left picture, there is a T piece in the coolant hose (marked with blue), from which another hose is running down to the left engine bank. The hose then connects to the metal pipe (second picture, with the part number) and the metal pipe is then bolted with the banjo bolt to the engine block (left bank). The banjo bolt is located well below the swirl flap mechanism.
It was really difficult to locate the leak. I was with my mechanic at the time and we luckily spotted just one drop running down the left bank under the banjo bolt, when the coolant system was pressurized. A bore-scope camera has helped a lot as there are many pipes, hoses and cables blocking the view.
1984319844

We decided to change the metal pipe, all the washers, clips and the banjo bolt, together with a short coolant hose running from the bottom of the EGR cooler to the engine block. Parts cost £38 and my mechanic charged £120 for the labor. Given the amount of things that had to be removed to get to the banjo bolt itself, I can't complain about the price.

So I will monitor the coolant level and will keep you posted.

Hope this post will help other forum members with similar problem!

[theskyfox]

Thanks for the post about this. My car is still under warranty until April 2014....so far 2 years and 19,000 miles haven't seen anything (touch wood). About to start driving 50 miles a day to work..so will keep an eye out.

-Andrew

[Audijager]

I'm about to receive a hefty bill due to a coolant leak through the EGR valve on my 2010 A6 V6 3.0 TDI (130,000 mostly motorway miles).

it manifested itself initially via a low coolant level warning whilst driving on the motorway and some black exhaust smoke evident when manouvring around the motorway services seeking water. Remaining 65 miles completed, coolant level warning re-appeared just before arrival. Topped up again and next day drove 15 miles to Audi dealership. Plently of action en-route (DPF warning, but only for a couple of minutes, continuous flashing glow plugs warning and reversion to limp mode. Coolant level warning after a while too (engine temp normal at 90 deg at all times).

Pressure testing located the leak in the EGR valve and several EGR parts need replacement. What confuses me is the apparent possibility that the DPF may also need replacement. The DPF was clearly unhappy at some stage, but can anyone here suggest why coolant ingress (which did initially have the correct anti-freeze concentration) could damage a DPF?