Bought a Jaguar XK X150 4.2 YEAR 2006 few months back. Loving it but have a question regarding my Jaguar ZF 6HP26 transmission.I've garaged my car for 4 weeks due to holidays.After starting the car yesterday and driving noticed whining noise under the gear lever which increases as you accelerate and vanishes once you stop or idle.I have only owned the car for 6+ months and novice on gear issues.Mileage on car is 90000 miles ..no record of last transmission oil change.No fault codes on dash or limp mode.Any advise highly appreciated.
Thanks
London UK based.

 

You may be screwed already.
The thing do do now is to have all the fluid. There are many threads already about this whole procedure, so no need to rehash it again.

This is from the "Search" function on the first page of the X150 forum...
https://www.jaguarforums.com/forum/s...rchid=15138795

 

car was fine prior to being parked in garage.
scan on creader professional crp129..showing no dtc.
​​​​​​Will transmission fluid change remedy the issue or i need to take the car to jag specialist for diagnostic.

 

Will transmission oil change remedy the whining noise?
Any recommendation for transmission oil change workshop in london will be appreciated.

 

You probably want a ZF transmission specialist rather than a Jag specialist.
Take a look at these links, I have no experience with any of them,

https://aftermarket.zf.com/en/afterm...ocality=London
https://www.gearbox-flushing.co.uk/services/zf/
https://www.dukesparkautomotive.co.u...rbox-servicing

 

As most of us have learned, it is quite surprising how much of a difference the new fluid does have.
I’m with Cee Jay, Get it changed NOW, if there’s any chance of saving it.. There will be a few insignificant parts to be changed as well, the pan and integrated filter, the megatronics sleeve. Perhaps some components to the valve body.
While its up on the hoist, change the diff fluid too.

FYI, I change mine on 50k intervals…

 

Thanks Norri / Guy / Cee Jay.
Is it OK to drive the car or to get it towed to transmission specialist?

 

whining is not very loud at the moment but noticeable

 

Is it a couple of miles up the road or a couple of hundred?

 

Me…. I’m nervous about these things. Flat bed it. (Of course where I am, this is covered by my car club).
The jury is still out with me that it is definitely a transmission issue. I take it to a jag (and LR) specialist shop myself.
Reason being, if its not the transmission, do I want the transmission guys mucking with the car.
If it is the transmission, and if my specialist shop can’t handle it (which has never happened, btw) they can ship out the transmission/car.

As you’re in the big London, this should be easy.

 

looking at max 25 miles

 

Will jag specialist diagnostic pin point the fault location...or it is trial & error issue.
Based in Big London

 

I would start with a few tests. Put the car into drive, hold down the brake, increase the revs. Does the sound appear?

Drive the car on the road. When you hear the sound select neutral and allow the car to continue to coast for a few seconds. Does the sound disappear?

I agree with all the above who say that you should change the auto fluid as soon as convenient as 90k is pushing it a bit. However, it might not be the gearbox (I suspect that it isn't unless the car has been driven really hard for many of those miles) and, even if it is, I doubt whether there has been any permanent damage.

Richard

 

Thanks Richard.
I'll perform the above two road tests and revert back with update.

 

Richard as suggested i have now performed both road tests with my better half on passenger seat to asses the sound and result is same...whining continues.
The sound is very low pitch under the gear lever and more like old locomotive train and kicks in once car reaches 10mph.

 

Correction..
No whining sound during car in gear with pressed break and increased revs.
Sound continues in coasting mode.

 

It sounds to me as if the sound is something related to parts which spinning when the car is actually moving along the road. I'm thinking wheel bearings, differential bearings, universal joints or central prop shaft bearing. If you're sure that the noise is not coming from the rear end or either side, my money would be on the central prop shaft bearing.

If you can get under the car and spray the centre bearing liberally with WD40 on both sides, you might find that the noise alters or stops for a while. It's not a fix, obviously, but is the confirmation of what needs to be replaced. It might not work as the bearing will be sealed, but it's worth a shot.

Richard

 

I would definetly get a reansmission oil and pan change. Ive just had mine done at 60k. Genuine ZF oil and pan filter used. Theres a noticable difference, super smooth gear changes.

 

Thanks Richard.
I strongly believe your analysis makes sense and will lubricate centre bearing weather permitting.
Once the whining noise part is identified jag transmission will be serviced along with the faulty part replacement.

 

ZF service kit ordered.
Thanks