Can someone confirm the part number for the Solenoid kit for the ZF HP26 in a 2007 TDV8. I am pretty sure the ZF kit number is 1068298044 but have been unable to confirm 100%


 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

Yes, that’s the correct kit for the M-shift version of the 6HP26X used in the L322 i.e. 3 x yellow, 3 x blue & 1 x black.

The solenoids shown in your photograph above are clearly ‘used’ ones because the blue caps turn a dirty green colour after many years spent in hot fluid, and the yellow caps turn a darker yellow/orange.



Phil

Thanks for that RRPhil. Maybe you could answer another question about these solenoids. There seem to be many options to get refurbished ones along with new genuine ZF ones. In my case the gearbox is working fine, I know that it had a fluid change and new steel sump but not when. It has also had the latest software flashed recently at the dealers. I am planning to change the fluid and filter again along with the valve body sleeves and bush plus the mechatronic bridge seal. I can't afford a genuine set of new solenoids but was thinking to swap mine with a refurbished set while the valve body is out. Do you have any experience with refurbished solenoids, would you use them or just leave the old ones in. The car has done 130000 miles. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

I personally don’t have any experience with refurbished solenoids. Page 14 of this Sonnax document : https://www.sonnax.com/tech_resources/423-...r-60sn-09d shows the internals of the EDS solenoid, once it has been cut open, and I’m struggling to imagine what exactly can be refurbished. Problems are generally caused by wear in the armature pin guide hole & its sealing face, as can be seen in this video by Richard Wardell :

).

Here in the UK, a full set of genuine new solenoids costs between £300 & £400 (AU$550-AU$750) and I don’t know how much a set of ‘refurbished’ ones cost in Australia but I personally would consider this route to be high risk, unless the solenoids are supplied with test results showing their measured individual pressure vs current characteristics. Do you have any diagnostics kit capable of reading off the pressure & time adaptions for your existing solenoids? If they’re all within limits, then I’d be tempted to stick with them.

Faulty solenoids generally cause their respective dampers to be hammered flat



(i.e. this is a good indication of a faulty solenoid) but if you split the two halves of the valve body assembly to check & replace the dampers you will need to buy a new intermediate sheet (separator plate), and they aren’t exactly cheap, either.

What a great video, I have recently watched many how to`s on the HP26 but no one has even attempted a teardown of the solenoids, only a resistance check. I will try to find out what is involved in the refurbishment, I just presumed new o rings, a clean and test that they are in spec and maybe new filter screens. If they also include new plastic caps with the brass bushing that the video shows wearing oval I might be tempted. A set is only A$150. Is it common for the dampers to be flattened/destroyed, I would not even consider splitting the valve block. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

The EDS solenoids are the Achilles’ heel of the 6HP26/28, so it isn’t unusual for the dampers to be flattened. Sonnax produce a Zip Kit which replaces the rubber damper springs with steel helical springs, but I generally just replace them with new (rubber) ones.

That is beautiful engineering, love it.

My Mechatronic was rebuilt by a previous owner at a cost of just under £1500 some 14000 miles ago. I hope they did it correctly! because that looks complex.

David Range Rover 4.2 Supercharged 2006
Ford Focus EcoBoost 1.5 2017
MG TF 2003

Previous Cars of note
Land Rover Discovery 2
Jaguar Mk2 3.8 - Company car
MG Midget 1974 - Concours

Goes without saying that the real fun starts when you painstakingly go through each individual hydraulic circuit and calculate the pressures required to actuate each of the spools. Who would be sad enough to do that?

Click image to enlarge

Click image to enlarge

Fully approve of your approach RRPhil, in understanding the systems you work on at the design level. That is very rare in the automotive world, chapeau!

Merry Christmas to all!

fanders  ---------------------------------------
2009 4.2 SC Buckingham Blue
2021 Hilux 2.4