Overheating gearbox

gstuart · May 19, 2025

Am also searching through the workshop manual for the gearbox heat exchanger cooling side , just trying to cover all bases so to speak

As there’s the flat plate gearbox cooler with the 2 x pipes for the atf oil side and other 2 x pipes from the engines water cooling side

Will come back to u if I find out any further details for u mate , ie, if the overheat temps are in the workshop manual etc so then at least we will know what the trigger points are so then could look via the live data on the scanner

gstuart · May 19, 2025

Blimey these workshop manuals have a lot of pages

Just had it in the back of my mind if there was anything else that could also cause issues and started to look on the cooling side of the ATF heat exchanger and came across these , alas haven’t confirmed as of yet if u have one fitted to ur model

Don’t know if ur able to see any of these items as of yet plse , particularly if things are in the way

IE

The Automatic Transmission Fluid (ATF) warming valve is a thermostatic ATF mixing valve. The valve is designed to reduce the ATF warm up time and provides a precise temperature control for the ATF temperature. The ATF warming valve mixes the hot engine coolant from the thermostatic control valve and the cold engine coolant from
the radiator low temperature zone. This provides the desired temperature control of the ATF temperature.

Hope it’s useful mate and expect I’m totally barking up the wrong tree but wished to try and read up as much as I could of the workshop manual in case there was something else

Plus looking at some pictures I think that round transmission electrical connector may twist off instead of directly being pulled off , I will of course try and see if that’s the case or not mate

Hope this may also be useful to u mate

gstuart · May 19, 2025

Ref that picture of temperatures , do u have the left hand side of the picture to show what sensors there reading plse

As maybe there from an ATF warming valve

Many thks and when u get chance if you would be so kind to have a look if there’s one fitted by ur engine plse , thk u

gstuart · May 19, 2025

Oh wow never seen these before

Additional filtration kit ZF 9HP48 from MAKTRANS-AP – Buy Now for $75.6 USD

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gstuart · May 19, 2025

Also finally managed to find better pics of that connector both inside and out

gstuart · May 19, 2025

Ref cloning of tcm, for the 9hp 48

Cloning & Virginising ZF 6HP, 8HP, 9HP TCM - Old Jaguar

Just some general information about cloning & virginising of ZF TCMs for JLR vehicles, in case of needing to fit a 2nd hand TCM to a vehicle.

oldjaguar.com

The 9HP TCM is known to have internal faults, in which case the TCM should be replaced however JLR does not sell the TCM as an individual spare part, neither does ZF. In which case the only economical alternative is to source a used TCM, but the VIN of the vehicle is stored in the TCM and in case of VIN mismatch, various faults will be reported on the dashboard and the transmission will be stuck in limp mode.

We are able to clone your existing TCM into the used replacement, or virginise a used TCM that it can be programmed as a new module to the vehicle.

tyregeezer · May 19, 2025

Hi little round thing is grommet for air box, looks like a pipe in picture I must admit, worked through it today, down to sump at last everything came off useable and undamaged, lot of hassle but wanted a good view, you can now get a good view of cooler I fitted, couple of small oil leaks and replacing all air con orings bit of zinc here and there
Parts arrived just now temperature sensor is the little bit sticking out from sensors at 45°
Next job is to clean all around area before removing sump most likely Wednesday
Clean up an bench sort out first and work keeps getting in way
Haven't found anything obvious at moment but early days yet
All the best

tyregeezer · May 19, 2025

Thanks again mate will see what happens next as bits now arrived, but would be a great saving if that's the next step, fingers crossed its sensor, what a gerfuffule to get too, and to put back I'll bet, many thanks once again mate, will let you know readings once I get it out and unplugged
All the best

tyregeezer · May 20, 2025

Hi mate thanks for plug pictures could work out that plug turned anti clockwise, was just being over careful didn't want to break the tab, two thumbs and twist of the connector ring thingy and it popped round, up, and off
Pins all look in mint condition, wiring too so far
Start on change over tomorrow all the best

gstuart · May 21, 2025

Blimey mate and times like this when I miss the good old days where engines useto be considerably easier to access along with a lot more room around them

great you’ve now got to them and the info was useful in order that u could get the parts out , Along with that water cooling / heating assembly , blimey they don’t make it easy do they

Wonder if jlr could also tell u if there’s an update or maybe pat at gap , know I got some updates done for my turbo actuator for £25

See that assembly is around £90 and imagine it’s the original one , have been trying to do even more research on it

Hope u continue to make good progress , Huge credit to u and look forward to see how u get on

tyregeezer · May 21, 2025

Yes mate see now why you were interested in water and transmission temp being same on live data, might just change transmission warmer getting to it at later date would be a real pain,
Yes all overcomplicated and squashed in, very difficult to see, once your hand is in the way Lol
Not 100% but think software update is free, just need to book in will call them first hand to see what's what
Also going to replace egr while it's in workshop as should be last issue, then can worry about update if needed many thanks mate for your keeping an eye on me all the best

gstuart · May 21, 2025

tyregeezer said:
Yes mate see now why you were interested in water and transmission temp being same on live data, might just change transmission warmer getting to it at later date would be a real pain,
Yes all overcomplicated and squashed in, very difficult to see, once your hand is in the way Lol
Not 100% but think software update is free, just need to book in will call them first hand to see what's what
Also going to replace egr while it's in workshop as should be last issue, then can worry about update if needed many thanks mate for your keeping an eye on me all the best

Indeed ref the live data as spent some time tracing it all back and where the readings were coming from and if one could effect the other so agree that’s why I wondered if it was also relevant

Think ur spot on there mate in changing it now as u say a right sh-it to change later on with everything put back together

Likewise as would have thought it would be free but like everything with jlr they like to charge when ever they can

At the end of the day certainly can’t make the situation worse that’s for sure and will be a great way of eliminating a lot of parts

Thats a good idea about the egr as assume that’s also water cooled and that heater I imagine is tied into it one of at or another

All good fun as they say

No worries and always happy to assist from afar where I’m able to

Will send over diagrams etc when I can find them for u and if there’s anything else I can assist with plse don’t hesitate to give me a shout

All the best and chat soon mate

gstuart · May 21, 2025

So out of curiosity wished to double checked and indeed the egr is water cooled

gstuart · May 21, 2025

Apologies and hope u don’t mind me mentioning it as kept meaning to say know the lifeguard can be expensive to fill and drop so seen this 10 x litre container of an alternative fluid which I thought may be cheaper for u seeing u can get 2 x basic fill and drops and then using the lifeguard for ur final fill

Mannol ATF AG55 Automatic Transmission Fluid Oil For BMW Land Rover VW Audi 10L | eBay UK

A special all-season synthetic transmission fluid (ATF) for new-generation 6-speed automatic gearboxes of the ZF Group. - It has an increased thermal-oxidative and chemical stability and resistance to the high-temperature thermal degradation throughout the entire service life.

www.ebay.co.uk

Once again hope ur don’t mind me mentioning it

tyregeezer · May 23, 2025

Not at all mate, but have already bought lifeguard thought I'd stick to same, came from same source as service parts, just about to drain and remove valve block before work today
Will post some pictures later, can't see any means of regulating flow to cooler, comes out of bottom of radiator through cooler into engine block, no valves or alternative pipework so unsure at moment will study Manuel at some point during reassembly (many thanks)
Also ordered new egr and gaskets/filter for egr cooler will remove and clean, hopefully not dpf next, going to get on now finger crossed
Giving up smoking not helping with my normal thought process Lol all the best

gstuart · May 23, 2025

No probs ref the atf and understand where ur coming from

Does seem to make more sense after reading the extract further up in the previous thread , number 62 , of what’s on the oil cooler pipes and that warming valve etc, also been searching for a decent parts catalogue

Easy for me to say as I’ve been through it but going over to a vape ur soon feel a lot better and honestly mate is one of the best things I’ve ever done along with saving money

Keep up the great work mate and thks for the update

tyregeezer · May 23, 2025

Yes will continue to work at it, but doing well since have smoked for 45 years
Gearbox went ok today valve block was bit tight but came out in end, used a socket to compress neutral manual selector, see a strip down video on YouTube simply followed what he did, valve block out then speed sensors, range sensor, then through box socket, took the whole block to the bench, three screws held sensor rail and it unplugged from solenoids, connecting tubes complete with orings switched one at a time matching lengths, then just reversed process most awkward bit was wires were stiff and was difficult to get them in a good position
All done up with new bolts, cover refitted continue putting back together tomorrow
Have a good weekend

Firebobby1 · May 24, 2025

tyregeezer said:
Yes will continue to work at it, but doing well since have smoked for 45 years
Gearbox went ok today valve block was bit tight but came out in end, used a socket to compress neutral manual selector, see a strip down video on YouTube simply followed what he did, valve block out then speed sensors, range sensor, then through box socket, took the whole block to the bench, three screws held sensor rail and it unplugged from solenoids, connecting tubes complete with orings switched one at a time matching lengths, then just reversed process most awkward bit was wires were stiff and was difficult to get them in a good position
All done up with new bolts, cover refitted continue putting back together tomorrow
Have a good weekend

Total respect,

gstuart · May 24, 2025

tyregeezer said:
Yes will continue to work at it, but doing well since have smoked for 45 years
Gearbox went ok today valve block was bit tight but came out in end, used a socket to compress neutral manual selector, see a strip down video on YouTube simply followed what he did, valve block out then speed sensors, range sensor, then through box socket, took the whole block to the bench, three screws held sensor rail and it unplugged from solenoids, connecting tubes complete with orings switched one at a time matching lengths, then just reversed process most awkward bit was wires were stiff and was difficult to get them in a good position
All done up with new bolts, cover refitted continue putting back together tomorrow
Have a good weekend

Fantastic work as always mate and indeed Huge credit to u for sticking with it and working ur way through thr canbus and rest of the systems

Bet u also can’t wait to see what the results are like

Thks for sharing such a fantastic thread and look forward seeing how things to

tyregeezer · May 25, 2025

Thanks guys, not to bad a job, really as long as it works Lol
Started to put back together yesterday did go backwards a couple of times, bit fiddly but just lights and bumper to do
Trying to work out what's issue with egr being unplugged, removed tube from egr to inlet its blanked at egr, will refit for now and come back to that in near future, one thing at at time
Will finish up later, got to wait for assistance to fit bumper all the best, ps still not smoking

Overheating gearbox

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