[quote="Paul4751"]

jules wrote:

but my question is should it be done or left well alone?

I suppose if I was not keeping the car for very long or didnt mind paying for a possibly avoidable big expense then I'd not bother.

Of the people who havent had their haldex serviced, those who've had no issues will probably say "leave well alone " and those whose Haldex went bang will probably say " should have got it serviced". Both very biased answers.

Ideally you want info from Haldex on how long their device lasts without servicing on average. Haldex have already answered that in a roundabout way by advising on various servicing schedules; which JLR chose to ignore for financial reasons I assume.

My view is that if a device requires clean pumped oil for lubrication and function (hence the two filters) then allowing the oil to become old and dirty cannot be good for wear. You also have the effect of the pump's screen filter becoming occluded with time.


FWIW

My pump screen filter at 52K miles.
I had previously changed the haldex oil and replaceable filter at 33K miles, but didnt take the pump out at that time (cos its awkward on the late FL2's with the massive propshaft damper.) Jules

OxonPete wrote:

Ian,
Link doesn’t work….www.awdwiki……….says problem with site

Gen 4 is more relevant for Fl2’s I think

Found it --- Link to original thread about Haldex ---

https://www.freel2.com/forum/topic33791.html?highlight=haldex+4 FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 79k+ miles) (MY2015)
Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History
(Expensive, but Trouble/Worry free - hopefully?)

I made a note of this general info on Haldex III a couple of years ago. The first gen FL2s had the III.

Q: I was looking for a brief overview of exactly how the Land Rover Freelander 2 (LR2) Haldex system operates on the vehicle i.e. start-up process, standard front rear power split etc.. Some magazines and information say that the standard (lowest) amount of power sent to the rear wheels is 3% or 5% depending on source of information. I was hoping for some information that I could share with fellow car enthusiasts on a Freelander 2 forum www.freel2.com.

A: from Mats at Haldex; he drives an LR2 and was involved in the project: The Haldex system use several CAN (controller area network) signals from the vehicle to operate such as accelerator, brake pedal, wheel speed, engine speed, engine torque, gear position, lateral acceleration, yaw rate etc. The signals are read every 20ms and processed in the Haldex ecu and from that the ecu decides what the proper torque transfer from the front to rear should be.

When the vehicle is powered up the Haldex system will activate a feeder pump and close the valves to build up a base pressure for instant traction. The system will then wait for the signal from the engine speed to show a value higher than 400 rpm before it is ready to transfer any torque, this to allow you to perform two wheel tows etc. But as soon as the signals are there the system will be ready to give an immediate 500 Nm torque transfer until the system tells it otherwise (that is higher or lower torque).
It is unfortunately impossible to say what the standard torque level is since this is completely dependent on what surface you are driving on, what speed, what angle of your steering wheel etc, the computer in the Haldex will take all this into consideration each time and from that select the torque level.

What the magazines are talking about is the drag-torque, the torque that will always be there due to the energy used to turn the coupling, differential etc and that will be around 3-5 Nm.

From awdwiki.com:
Haldex-based all wheel drive systems are automatic all wheel drive systems. Haldex clutch is installed in the rear axle's differential housing and powers rear wheels.

Haldex Generation III, 2004-2008. A coupling with pre-tensioning capability of the hydraulic clutch by the means of existing feeder pump (PreX™ solution). Haldex Generation III, IV, and V based all wheel drive systems are proactive. The electronics can pre-tension the clutch and activate all wheel drive before a wheel slip occurs. Tim

Freelander 2 HSE i6 Stornoway Grey with Alpaca & Tundra interior
Driven many miles in:
2 FL2s
1 Range Rover P38
4 Range Rover Classics
Many military LWB & 1/2 ton Lightweight Series IIA & III

[quote="jules"]

Paul4751 wrote:

jules wrote:

but my question is should it be done or left well alone?

I suppose if I was not keeping the car for very long or didnt mind paying for a possibly avoidable big expense then I'd not bother.

Of the people who havent had their haldex serviced, those who've had no issues will probably say "leave well alone " and those whose Haldex went bang will probably say " should have got it serviced". Both very biased answers.

Ideally you want info from Haldex on how long their device lasts without servicing on average. Haldex have already answered that in a roundabout way by advising on various servicing schedules; which JLR chose to ignore for financial reasons I assume.

My view is that if a device requires clean pumped oil for lubrication and function (hence the two filters) then allowing the oil to become old and dirty cannot be good for wear. You also have the effect of the pump's screen filter becoming occluded with time.


FWIW

My pump screen filter at 52K miles.
I had previously changed the haldex oil and replaceable filter at 33K miles, but didnt take the pump out at that time (cos its awkward on the late FL2's with the massive propshaft damper.)

It’s going to depend on the kind of driving. If you are wafting along on a clear A road or quiet motorway you’ll be in 2WD for the majority of any journey. On the other hand, if you are driving in our traffic choked cities and towns and subject to 20mph speed limits then the Haldex is going to get a severe workout as it constantly goes in and out of 4WD!