BX Club Forum

BX nut · Post by **BX nut** » Tue Oct 13, 2009 3:22 pm

Hi I'm just wondering if all FDVs are the same or do they differ dependent on model of BX?
Any advice would be appreciated.
Thanks in advance

Oh yes and is £50 a good price for a second hand one?

MULLEY · Post by **MULLEY** » Tue Oct 13, 2009 6:56 pm

£50, sounds a bit expensive to me unless its been overhauled, anyone else?

Vanny · Post by **Vanny** » Tue Oct 13, 2009 7:05 pm

If it coems with any sort of warranty, or is a refurb then £50 is very good. If its just pulled off a scrap car then £25 maybe, and i wouldn't be looking to pay more than £20 if it has been sat for a long time.

Aerodynamica · Post by **Aerodynamica** » Tue Oct 13, 2009 7:54 pm

Yes they're all the same except early ones are green and later ones are black

BX nut · Post by **BX nut** » Tue Oct 13, 2009 8:45 pm

Thanks for your advice. It is coming off a car that has sat for a while but they started it and everything still works and it rises in 25seconds, so i have been informed. Is there a refurb kit available that i can use before fitting it to make sure it doesn't go pop straight after fitting.
Thanks
again

Aerodynamica · Post by **Aerodynamica** » Tue Oct 13, 2009 9:02 pm

There's a kit available from Citroen still (I think?) that has been mentioned before on here.

I think you get the O - rings for the 4 end caps, 2x nylon filters and the LHM pipe seals.

I personally don't think the kit is needed unless the FDV is actually leaking. The only main thing is to remove and check the 2 filters.

There is a sticky about FDV valves in th eforum and in my late blog "cyril's progress" I took photos of the dismantled FDV valve.

citronut · Post by **citronut** » Tue Oct 13, 2009 9:06 pm

just riseing is not proof the flow valve is any good, as it has nout to do with the upwards motion of ther car,

and in GSF's 06 catalouge they list flow valve N43444 95 quid

and a repair kit N43444A 27 quid,

but this device has to be calibrated on reassembly,

also i certainly would not pay 50 quid for a second hand unit how ever long it had or not been standing,

if your going to pay that i can find you two or three for that price

regards malcolm

Aerodynamica · Post by **Aerodynamica** » Tue Oct 13, 2009 9:18 pm

as it has nout to do with the upwards motion of ther car,

Sorry I don't agree there - a faulty FDV can prevent the suspension and brakes from pressurising if the main slide valve sticks, most of the in-flow from the pump goes straight through the stuck FDV and then through the PAS pinion valve back to the LHM tank and no pressure rises in the accumulator as a result. The only thing that seems to work is to move the steering to full lock whereupon the pressure rises due to the pinion valve closing. It took me a week to figure out why this was the cause of my non-rising BX.

@BXnut, -what is wrong with your current FDV? are you certain it's the problem?

Vanny · Post by **Vanny** » Tue Oct 13, 2009 9:42 pm

Are PAS and non PAS FDV's the same?

BX nut · Post by **BX nut** » Tue Oct 13, 2009 10:07 pm

Hi Graeme M
My FDV is leaking and has been for quite a few years but this year it nearly failed the MOT on it so I thought it about time I replace/fixed the problem. It only leaks a small drop but I cannot see where from, it looks like it comes from one of the two what look like blanking caps on the drivers side next to a pipe bracket bolt. It has only needed topping up with LHM twice in the six years I have owned her, which is why I have not bothered before now. She eventually passed the MOT after a heated debate that it had passed the previous six with the same fault. I just don't want the same problem next year and have a car with no MOT until I have time to fix it

Allan

MULLEY · Post by **MULLEY** » Tue Oct 13, 2009 10:32 pm

To save a lot of hassle & expense, why dont you just clean & wipe the affected area of any dripping lhm when it goes it for its mot, thus elimenating it from being failed. It may well be worth finding a good recon fdv in anycase for the future, but as the guy's have said i wouldnt pay over the odds for an unknown.

Aerodynamica · Post by **Aerodynamica** » Tue Oct 13, 2009 11:25 pm

Vanny wrote:Are PAS and non PAS FDV's the same?

Non PAS cars don't have the FDV so the non-PAS cars use pretty much all the same bits as a GS in terms of pressure regulator etc.

it looks like it comes from one of the two what look like blanking caps on the drivers side next to a pipe bracket bolt.

-ah, that's the common spot for leaking - the blanking caps are the end caps for the 2 slide valve bores inside - they're held in by a circlip each and they have an O ring seal that can weep a bit. There are another two on the other side too

As Mulley says you could just give them a wipe prior to the test next time - it's what I did!

Dollywobbler · Post by **Dollywobbler** » Wed Oct 14, 2009 3:50 pm

I agree with the two posts above. A really clean area will make the MoT man suspicious, but he can't fail it for suspicions. If there's no actual sign of a leak, he can't do 'owt.

citronut · Post by **citronut** » Wed Oct 14, 2009 9:17 pm

have you tried kniping up the pipe nuts, as quite offten these vibrate loose very slightly and weap a little citro blood,

regards malcolm

Mike E (uk) · Post by **Mike E (uk)** » Wed Oct 14, 2009 11:26 pm

I think they all leak there when they get old, but it does not seem to stop them working.

I got a BX through the MOT for a few years by smearing chemical metal by plastic padding around the blanking covers, stopped the leak for a bit.

I bough one from Pliades eventually, and this has not started leaking yet.

It was pricy though.

Mike