non hydractve supply piping routeing

[citroenxm]

Brake feed pipe to the rear is a larger diamiter then the other three suspension pipes..

if its a brake pipe it will goto the abs hydraulic block IF abs is fitted.

[c.morewood]

I'm puzzled Paul.. this was definately a 3.5mm pipe I've removed and it did come from the K where the 4.5mm anti sink pipe comes from on the o/s. I'll have to try to follow it tomorrow and see where it goes. (i have ABS)

[citroenxm]

Ok. Im fairly certain theres only 4 front to backs. 3x 3.5mm pipes and 1x 4.5mm and a plastic low pressure return.

a 4.5 pipe goes From the abs block to the rear NEAR SIDE K joint.
a 3.5 mm pipe goes from ONE of the joins on the bulk head for the brake valve to the rear height corrector
A 3.5 mm goes from the height corrector to a push fit return at the front just below the lhm tank
A 3.5mm goes from the safty valve to the OFF SIDE K joint to feed the suspension.

The 6.5 is a plastic low pressure return line

[NewcastleFalcon]

Chris




Have you seen my little diagram of the rear plumbing on my 1994 Xantia 1.9tdsx?

The full story is in my thread entitled something like

Xantia brake pipes-My No 9 needs replacing

kind regards Neil

[NewcastleFalcon]

For people in the same eyesight category as me (over 50's with less than 20/20 vision!) here is a bit bigger version



Neil

[c.morewood]

Thanks for that Neil.. Thats just confirming that it is the brake pipe .. i just now have to find out how easy it is to access at the front end.
Thnks to you and Paul for all your help.
Chris

[RichardW]

Chris - it runs to the block of 4 connectors on the front firewall. The brake 'service' pipe (ie the 4.5mm one that is only live then the brakes are pressed) runs from the ABS block.

I think Paul's list needs a bit of tweaking....

a 4.5 pipe goes From the abs block to the rear NEAR SIDE K joint. OK
a 3.5 mm pipe goes from ONE of the joins on the bulk head for the brake valve to the rear height corrector - no, it goes to the O/S K connector that has the 4.5mm connection for the AS sphere (and flows rear to front)
A 3.5 mm goes from the height corrector to a push fit return at the front just below the lhm tank - OK
A 3.5mm goes from the safty valve to the OFF SIDE K joint to feed the suspension - no, it goes to the anti sink valve

[c.morewood]

3 hours later and I'm no farther forward.
At first I tried from the bottom .. wishbone removal etc. all off apart from the LAST NUT, why is it always the last nut?Its rounded and going nowhere.
So I thought I might take Paul's advice and go in from the top well I got as far as the 5 way joiner... but the pipes won't come out ARGGHH!!!
So I decided to take a couple of pictures to share with you, give my neck a rest and ask a couple of questions.
Since I can't seem to get any farther and hopefully all the Xantia were consrtucted using the same methods. Do you know exactly which terminal the 3.5mm brake pipe terminates at? That way I'll stop trying to feel the route of the pipe and just feed the new one up.. I have a nagging feeling that I might need a joiner after all as the supply pipe (which is what I thought it was) is 3690 and the brake pipe 3768.. however there was quite a bit of a spare loop above the rear subframe .. so I'm hoping....


Are those the connectors in blue on the firewall Neil?


With the offending nut in the foreground!!

[NewcastleFalcon]

Chris

From the diagram on service citroen the no 9 pipe is supposed to go to the right hand one of the bank of 4 mounted on the firewall/bulkhead (ie the one nearest the passenger wing).





If its the full number 9 you are replacing you will have to undo the right union and pipe from the "bank of 4".

if its impossible to get at to undo without dismantling half the car trace down to under the car on a straight run and put a joiner in. You will need a tool like the one I borrowed. It made better flares in my hands on the new pipe than on the original steel but still quite serviceable.

regards neil

[citroenxm]

Chris - it runs to the block of 4 connectors on the front firewall. The brake 'service' pipe (ie the 4.5mm one that is only live then the brakes are pressed) runs from the ABS block.

I think Paul's list needs a bit of tweaking....

a 4.5 pipe goes From the abs block to the rear NEAR SIDE K joint. OK
a 3.5 mm pipe goes from ONE of the joins on the bulk head for the brake valve to the rear height corrector - no, it goes to the O/S K connector that has the 4.5mm connection for the AS sphere (and flows rear to front)
A 3.5 mm goes from the height corrector to a push fit return at the front just below the lhm tank - OK
A 3.5mm goes from the safty valve to the OFF SIDE K joint to feed the suspension - no, it goes to the anti sink valve

My list was off top of my head.. month's since I last been under a xantia and I was I bed and half asleep so I dont think I did so badly

[Northern_Mike]

For people in the same eyesight category as me (over 50's with less than 20/20 vision!) here is a bit bigger version



Neil

The long red pipe in this diagram is the one that needs replacing on my 1998 V6 with Hydractive II. It's a suspension pipe on mine, I believe. It is only rotten on the last 2"

I get the impression that Service.Citroen diagrams aren't wholly accurate.

I now have 5m of 3.5 cupernickel pipe, 4 ends, a load of seals, and 2 joiner pieces, so it shouldn't be too bad. Malcolm Lockwood supplied all this.

I also have a accumulator sphere to go on while it's depressurised. I hope Citronut's tool is better than mine.

[myglaren]

I also have a accumulator sphere to go on while it's depressurised. I hope Citronut's tool is better than mine.

Whether it is or not I'm sure Malcolm will have a ribald double entendre to punctuate that with.

[Northern_Mike]

I hope so!

Sent from my GT-I9300 using Tapatalk

[c.morewood]

if its impossible to get at to undo without dismantling half the car trace down to under the car on a straight run and put a joiner in. You will need a tool like the one I borrowed. It made better flares in my hands on the new pipe than on the original steel but still quite serviceable.

I think I "burned my boats" this morning Neil. I snipped off the pipe with a foot to go to the steering rack and then tried to push it up past the steering rack after freeing it from the 1st set of clips.. I was trying to trace it to make sure I got the correct end.. not sure about the Citroen diagrams and how accurate they are..( e.g. nowhere does it mention that the cylinder ends changed to C5 ones for some of the last Xantia) Well the pipe bent and now I probably have a kink in it.. so tomorrow I've got to get the 5 way connector free of pipes so that I can reach the buklhead,, the I can undo everything I did today on the front wishbone!! I wonder if a small bit of heat would release the pipes from the seals that are holding them?
Good luck with the V6 Mike!
What I did do and forgot to mention was get some shrink wrap tubing..the type with glue inside.. and run some over the exposed parts of the pipe i.e. the 1m exposed section from the "k" to where it enters the underbody shield.. just to try to protect the pipe a. when I was bending it and b. hopefully stop further corrosion. I'll use it on the rest of the pipe at the rear as well as I replace it.

[c.morewood]

Lunch time update..a (very) little heat helped release the 5 pipes from the connector. T
he guy who designed this wasn't a plumber!! that got me a visual with the firewall rack but no way was I going to be able to touch it.
So I then concentrated on the bottom end underneath the car and managed to cajole the cut end of the pipe out through the wheel arch.. it then took me about 2 hours to find where the pipe went .. the far side of the pipe bundle of course... and release it from the 2 pipe cluster clips that were holding it fast... 2 long screwdrivers came in handy... but the pipe would never have pulled through the grip they have is incredible.

So now I've shrink wrapped 2' foot and passed the new pipe through.. its long enough phew!!
I've moved the air intake out of the way (the whole intake including loosening the clip before the turbo, held all the rubber LHM pipes out of the way with 4 cable ties. released the, what I think is the, ABS block to give a little more room and now I can just touch the union with the spanner...but because of the surface rust I can't get the spanner to go on to the union.. thats for this afternoon..

There's still no room down there so even if I manage to get the union off with less that 1/8th of a turn at a time.
I'm not sure I'll get the new pipe on.
I've even been lying on top of the engine to try to get a better angle (it didn't work).
It feels like I'm taking half the car apart to get to this one little spot..

Oh and I almost forgot No. 9 pipe doesn't go to the nearside connector .. it goes to the 2nd in from the offside and is marked in Green.. That may help someone who is foolish enough to try this in the future!!