2004 transmission sounding dry ??? - Club Touareg Forums
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post #1 of 19 Old 06-14-2015 Thread Starter
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2004 transmission sounding dry ???

Hello all.

Calling all 09D transmission experts. What is this nasty noise that my transmission is making?

New VB installed by dealer a few years back but less than 5k kms on it since. This sounds had been here since the VB change but moved shortly after and never had the chance to get it back to the same dealer.

Checked the ATF level with the pump-in system and all seems fine.

Have a listen and let me know if anyone has heard this before please.

Thanks

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post #2 of 19 Old 06-15-2015
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What is the shift quality like?
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post #3 of 19 Old 06-15-2015 Thread Starter
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Other than the occasional 1 to 2 slam its no crappier than any other Touareg I have read about.
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post #4 of 19 Old 06-15-2015
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pin point the sound. It could even be the starter bendix that is stuck.

All vw/audi engines must use 507.00 spec oil except non-DPF R5/V10 engines that must use 505.01/506.01
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post #5 of 19 Old 06-15-2015
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its RPM related, gear box is in ''P'', my personal guess is exhaust system leak
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post #6 of 19 Old 06-15-2015 Thread Starter
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The sound is notably different when placed in drive or tiptronic 1st and revving a little with the brakes applied.
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post #7 of 19 Old 06-15-2015 Thread Starter
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Cavitation in the ATF ???

I was outside trying to get a better idea of where the sound is coming from and I am nearly 100% sure it's the transmission.

I am trying to figure out what work is done when the VB is changed. Obviously the last step is reinstalling the filter and an o-ring that has to be in straight.

If there were a leak in the pickup that allowed air to enter would this cause foaming and cavitation of the ATF? This is the sound I am trying to describe.

Imagine a drinking straw with a crack half way between your mouth and the top of the fluid. When you draw fluid up the straw with suction you also draw in air (venturi effect) and this causes the fluid to become full of bubbles. This also causes a hissing type of noise as the air is infused into the liquid.

Is this a plausible theory? Is there anywhere a valve body job can go wrong that would create this type of issue?

On a final note, I ran the rpms up a little in gear to heat up the fluid some then I checked the temperature on each side of the thermovalve on the ATF cooler to ensure that it was open. Both in and out hoses were equally hot to the touch so I am concluding that this valve is opening. While my hand was on the ATF rubber hose I could feel thumping like that of air bubbles running though the fluid. When I did try to add fluid with the engine running the fluid that came back out as overflow was covered in small bubbles. Is this normal?

Is this a possibility? Could the system be drawing air into the fluid before the pump?


Darren
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post #8 of 19 Old 06-16-2015
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Sounds plausible. Best you drop the pan and check the VB pickup seals and o-rings.

All vw/audi engines must use 507.00 spec oil except non-DPF R5/V10 engines that must use 505.01/506.01
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post #9 of 19 Old 06-16-2015 Thread Starter
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Yes, That's my next plan of attack. I started it again today cold and realized that in the first 30 seconds or so the sound is not there. If i understand correctly there is a least 3 litres of extra fluid in the pan when the engine is not running. This means that the seal may be under the fluid level when cold and then over the fluid level and sucking in air when it is above the fluid level??

I'll crack it open later today.
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post #10 of 19 Old 06-16-2015 Thread Starter
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Bingo !!

A picture is worth a thousand words!!! I'm sure my transmission has loved pumping fizzy fluid for the last five years.

I won't name the VW dealership but this is the quality of work you can expect out of some VW dealerships.

See picture attached. I don't want to know where the rest of my o ring is stuck.
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bearings , noise , sound , transmission , whine

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