So these days have been spring-cleaning days for this neglected XM. It's going back on the road as of Monday (if Mr MOT-man agrees on Saturday).
One thing that had to be done was an LHM change and general cleaning.
About 2-3 years ago I installed extensions to each return pipe on the LHM tank. I did this to be able
1/to watch the return flow and trace it back to specific components (as my pressure regulator clicks rather too often), and,
2/to easily change/clean the LHM filters -Citroen has been really silly to sell the car with return pipes that barely allow u to remove the LHM tank top, after u have fought a bit with it of course; I bet it makes many owners postpone maintenance-.
So here it goes: just tubes from the hardware store and...aquarium connectors from ebay. The pressure regulator return needed a wider metal connector. And tie-wraps everywhere. Not a drop or leak in 2-3 years of use.
I should say that the flow-watching plan is not working as u actually can't see much of the flow -unless there are bubbles in it-

. Only the pressure regulator return flow is somewhat visible (and this returns lots of fluid).
Off it goes, and to the side, so I can remove the LHM tank:
Connections from near:
Rocket-science technology:
First wipe of the tank top assembly (with petrol). When it came out, all was so black that I thought there were no LHM filters on:
I should have normally washed the assembly in petrol but sadly time was of essence, so tried my best in-situ:
Brand new LHM filters, no more than £20 from Cit. The emotion felt was probably not dissimilar to that of a teenage girl dressing her first pair of brand new high-heels for the 1st time -hope the XM also felt the same

- :
The return filter locates into place with this tiny bit of plastic, then the pump-sunction filter clips and locks it into place:
I couldn't find a role for the traditional hook for this filter (that I had safeguarded in a tiny plastic bag for 4 years and checked everyday it was there

), so it stayed out. Anybody knows better?
Then I removed the tank and put a spare, petrol-cleaned one I had ready. I couldn't decide if to re-use the old LHM or stuff fresh thing in. A test was required:
Equal quantities:
Old to the left:
The difference was clear. Then I remembered that the old mix was: LHM from 2006, then 5,000 miles on Hydraflush and Hydronet2000 in addition in 2007-08, and then about 50% fresh LHM top up in mid-2008 as I had had a leak.
The old filters had never been cleaned, here they are:
They are now washed and stored.
Re-starting with new LHM was without funny antics -like: the XM not wanting to go up, or jumping around, or lifting the rear but not the front etc- and I didn't need to prime the pump:
always remember to slacken the 12mm return bolt on the pressure regulator before re-starting up the engine, and then let it run as such for a few minutes, otherwise any air sucked by the pump is guaranteed to be evenly distributed around your hydraulic system!!
So that's one happy XM now LHM-wise!!
Next is brake-bleeding -last time done March 2006-.
cheers
George