5HP24A Valve Block internals
 

After doing yet more research on the 5HP24A box in the 8, I stumbled across a very kind and helpful guy (who happens to design automatic transmissions for a living and likes to rebuild 5HP24's in his spare time!!) who fully dismantled, cleaned and inspected my valve block in the quest to try and pin-point the issue in my box.

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In looking through the official ZF parts catalogue for my ECZ transmission, I noticed that the Audi part number for the filter that is meant to be fitted is 01L 325 429B. I then looked back at the invoice from Audi for the filter they supplied and it was 01L 325 429A! It seems there is an error on Audis system as when giving them my chassis number it thinks the earlier DTD gearbox is fitted when that clearly isn't the case.

I could only find a bit of info about this on the net but on closer inspection when comparing the 2 filters, the pick up tube on the A version is 10mm longer than the B version and consequently when the A is fitted to a later box the tube is too close to the oil pan and so starves the box of fluid which I guess it what was causing the issue (I don't know for definite as the valve block isn't back in the box yet with the correct filter).

It's nice to have got the solution to the problem but I fear the damage to the box has already been done. Hopefully Audi may do something about it?

Well, if its any help Audi Glasgow agreed to warranty my box until further notice after they screwed up the oil service.

Whoever did yours ought to do the same.

That's encouraging. As they supplied the wrong part they are liable. I have already logged a case with Audi UK. We'll see what happens. . .

If it was me I would be pushing for a new gearbox or you tell the Audi world of their incompetence, Oh you already did that. but seriously I would press them for it.

Well after a few more conversations with Audi, we have found that the chassis no. and gearbox code do in fact match up. It seems that my local Audi garage somehow got the chassis number information from the reg. no. of the car (even though I gave them my chassis number). The reg. no. is still registered to an A8 on their system just not the right one. . . It must be the previous car that the private plate was registered to.

As the car has been on the forum for a number of years, can anyone shed some light on this registration number query?

Hi - the plate I sold it with was also the one I bought it with from IT so he might be able to share what the reg was before that. I believe it was a W-reg but don't have a record of what it was I'm afraid.

Oli

Hi Oli,

It's not so much what the previous plate of the silver 8 was. I just wonder what car was previously registered to L10 NWP.

Ah, that I wouldn't know - sorry! But IT might - if he does I'm sure he'll be along shortly!

Oli

I hope so, that would be a great help.

I though I would post my final findings. . .

It seems that all the problems started with the private plate which is registered to the car. The previous car the plate was registered to was a PF A8 with an earlier DTD gearbox (which happened to be on Audi's system) and so the incorrect filter was ordered.

New filter fitted (correct version with the shorter pick up tube) with fresh Mobil ATF and it's running beautifully smooth, as it should be.