Transmission questions

HPsauce · #1 17th October 2013, 05:40 PM

Quote:

Originally Posted by Mugzee

If you have VCDS: http://www.ross-tech.net/vag-com/adv...AF_TechTip.pdf

Did a quick check today and the values were well within spec. Didn't do the redline test run though.

Mugzee · #2 17th October 2013, 06:06 PM

I haven't had time to do anything on the car yet other than buy bits for it. Had it a week today. Will be servicing the transmission on sat then have a play about with VCDS.

Do you think it's worth putting my other car in the Sales section? It is from the VAG group however not an Audi. Worth a try I suppose. . . .

Mugzee · #3 3rd November 2013, 12:08 PM

So a bit of an update really. . . .

Drained the transmission fluid yesterday and it was RED ATF!!! So annoyed. I have receipts from Audi for changing the fluid so unless it has been done since, they are the ones who put this fluid in. I still can't believe it.

I changed the filter, drain plug, relevant seals and gaskets, plus the all important Audi fluid. Carried out the fill procedure exactly. There were no metallic particles on the magnets, just the usual film of black deposits on the sump.

The thing that concerns me now is that when driving along at a steady low speed, then decelerate, the transmission seems to hunt to a lower gear and does so quite violently, shocking the drivetrain. Other than that, gear change is pretty smooth. This issue is a direct consequence of the fluid change as it didn't exist before.

My initial thoughts were that the fluid was low but I went through the fill process again and the level is fine. I'm now thinking that the mixing of the 2 fluids is causing an issue. . .

Any thoughts on this?

Mugzee · #4 3rd November 2013, 08:57 PM

Just had a quick read through the service history and the ATF used was G052162A2 which is the Audi part number, however I'm pretty sure Febi make an OE replacement fluid under the same part number which is red. Still, it's not the proper Audi fluid. . . It was also £39.05 for 5 litres which is cheaper than genuine fluid.

Does anyone think that the mixing of the 2 fluids is what is causing the problem now?

The_Laird · #5 4th November 2013, 07:21 AM

I'll refer to my original advice which was to get it done professionally by someone who has the equipment to flush it properly. There are plenty of citings here about gearbox failures after an amateur fluid change, usually thought to be due to 'distrubing the sludge'. I'm not a gearbox expert, but I'd guess that mixed transmission fluid is not a good idea.

Mugzee · #6 4th November 2013, 08:32 AM

Quote:

Originally Posted by The_Laird

I'll refer to my original advice which was to get it done professionally by someone who has the equipment to flush it properly. There are plenty of citings here about gearbox failures after an amateur fluid change, usually thought to be due to 'distrubing the sludge'. I'm not a gearbox expert, but I'd guess that mixed transmission fluid is not a good idea.

When I had a lengthy conversation with a tech guy from ZF, he said that it simply isn't possible to "flush" the transmission due to the design as there will always be fluid left in the TC.

If you have a good knowledge and experience of mechanics, a drain and fill procedure is really quite straight forward. If you have actually been through the process you'll see that (in my case anyway) it's not actually possible to disturb any "sludge" as all the contamination is being removed from the sump when it's taken off and cleaned. Anything else will be inside the transmission and out of reach of the localised work that's being carried out.

If you think about it, the internals of the transmission are draining every time you turn off the engine, the only difference with a drain and fill is that you're changing the fluid.

I would have had the same issue if anyone else had carried out the service and would have had to pay them for the same outcome. The long and short of it is, it didn't have the ZF/Audi fluid in the transmission and so inevitably the 2 fluids mixed which is why I think I'm now having problems. I unfortunately couldn't tell what fluid was in there before the procedure was carried out and anyone else doing the work wouldn't have been able to tell either.

I wonder if the filter screen on the TC clutch solenoid is partially blocked?

I'm looking for some useful input by other mechanically knowledgable people who may have had the same experience as me. I can't believe an Audi garage (York Audi) put a non genuine fluid in.

Oli18 · #7 4th November 2013, 09:46 AM

Hi Mugzee,

Sorry to hear about your woes. Just to confirm that the gearbox oil was not changed during my ownership (really due to consensus around just leaving it given the issues some have seen after a change) and that York Audi would have been the last place it was done before my ownership.

Hope you get it sorted.

Oli