Does the lhm resevoir have any seals?

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Pcheaven
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Does the lhm resevoir have any seals?

Post by Pcheaven »

My tank appears to be weeping lhm between the tank itself and the octopus fitting that accepts all the pipes.
It’s a tiny leak. But a leak none the less

Before I disassemble. I just wanted to ask, is there a seal here that may need replacing.

I dont want to take it apart only to find I need a spare part?

Weirdly I couldn’t find any videos or pictures showing a tank disassemble and clean that might answer my question.


Cheers all
BX Meteor. Sub 20000 miles. Very Original.

ToDo list.

1. ̶G̶e̶t̶ ̶c̶a̶m̶ ̶b̶e̶t̶ ̶e̶t̶c̶ ̶r̶e̶p̶l̶a̶c̶e̶d̶ ̶e̶t̶c̶
Have a GnT
2. G̶e̶t̶ ̶t̶h̶e̶ ̶r̶a̶d̶i̶o̶ ̶t̶o̶ ̶w̶o̶r̶k̶.̶ ̶
Have a GnT
3. Adjust the clutch
Have a GnT
4. Clean LHM tank then a complete flush
Have a GnT
5. Wash, clay bar then ceramic coat paintwork.
Have a GnT
6. Replace rear spheres
Have a GnT
7. Replace bottom hose

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white exec
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1996 XM 2.5TD Exclusive
2003 Toyota RAV4 2.0 D4D
x 38

Re: Does the lhm resevoir have any seals?

Post by white exec »

#5 here.
Still showing available from Citroen.
It's the same part as fitted to Xantia and XM. These eventually crack and leak.
.
LHM tank top seal.JPG
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Chris

Pcheaven
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Re: Does the lhm resevoir have any seals?

Post by Pcheaven »

Very helpful. Thanks

New part has now been ordered from chevronics
BX Meteor. Sub 20000 miles. Very Original.

ToDo list.

1. ̶G̶e̶t̶ ̶c̶a̶m̶ ̶b̶e̶t̶ ̶e̶t̶c̶ ̶r̶e̶p̶l̶a̶c̶e̶d̶ ̶e̶t̶c̶
Have a GnT
2. G̶e̶t̶ ̶t̶h̶e̶ ̶r̶a̶d̶i̶o̶ ̶t̶o̶ ̶w̶o̶r̶k̶.̶ ̶
Have a GnT
3. Adjust the clutch
Have a GnT
4. Clean LHM tank then a complete flush
Have a GnT
5. Wash, clay bar then ceramic coat paintwork.
Have a GnT
6. Replace rear spheres
Have a GnT
7. Replace bottom hose

RobC
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Location: East London
My Cars: 1991 Citroen BX 16v
x 16

Re: Does the lhm resevoir have any seals?

Post by RobC »

The seal isn’t meant to be 100% oil-proof because the tank is never meant to be filled that high. If your tank is leaking at the seal then it means you’ve overfilled the tank...
1991 Citroen BX 16v

Pcheaven
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My Cars: Landrover discovery sport 2020
Previously ipace/discovery 5/velar and many others including 2 bx gti back in early 1990
x 6

Re: Does the lhm resevoir have any seals?

Post by Pcheaven »

RobC wrote:
Sat Apr 24, 2021 11:09 am
The seal isn’t meant to be 100% oil-proof because the tank is never meant to be filled that high. If your tank is leaking at the seal then it means you’ve overfilled the tank...
Nope the levels are perfect - as checked when the suspension is high.
BX Meteor. Sub 20000 miles. Very Original.

ToDo list.

1. ̶G̶e̶t̶ ̶c̶a̶m̶ ̶b̶e̶t̶ ̶e̶t̶c̶ ̶r̶e̶p̶l̶a̶c̶e̶d̶ ̶e̶t̶c̶
Have a GnT
2. G̶e̶t̶ ̶t̶h̶e̶ ̶r̶a̶d̶i̶o̶ ̶t̶o̶ ̶w̶o̶r̶k̶.̶ ̶
Have a GnT
3. Adjust the clutch
Have a GnT
4. Clean LHM tank then a complete flush
Have a GnT
5. Wash, clay bar then ceramic coat paintwork.
Have a GnT
6. Replace rear spheres
Have a GnT
7. Replace bottom hose

User avatar
white exec
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Posts: 276
Joined: Sat Sep 12, 2020 4:04 pm
Location: Sayalonga, Malaga
My Cars: 1992 BX19D Millesime
- LHD, NA, AC, RP_5800
1996 XM 2.5TD Exclusive
2003 Toyota RAV4 2.0 D4D
x 38

Re: Does the lhm resevoir have any seals?

Post by white exec »

The seals do leak with age.
They shrink, harden and can crack, and as fluid sloshes around in the tank, some can weep out.
Affects both the original metal and the later plastic LHM tanks.
Chris

Pcheaven
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Posts: 163
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My Cars: Landrover discovery sport 2020
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x 6

Re: Does the lhm resevoir have any seals?

Post by Pcheaven »

white exec wrote:
Sat Apr 24, 2021 11:51 am
The seals do leak with age.
They shrink, harden and can crack, and as fluid sloshes around in the tank, some can weep out.
Affects both the original metal and the later plastic LHM tanks.
Makes sense to me. Otherwise why would there be seals in the first place.
BX Meteor. Sub 20000 miles. Very Original.

ToDo list.

1. ̶G̶e̶t̶ ̶c̶a̶m̶ ̶b̶e̶t̶ ̶e̶t̶c̶ ̶r̶e̶p̶l̶a̶c̶e̶d̶ ̶e̶t̶c̶
Have a GnT
2. G̶e̶t̶ ̶t̶h̶e̶ ̶r̶a̶d̶i̶o̶ ̶t̶o̶ ̶w̶o̶r̶k̶.̶ ̶
Have a GnT
3. Adjust the clutch
Have a GnT
4. Clean LHM tank then a complete flush
Have a GnT
5. Wash, clay bar then ceramic coat paintwork.
Have a GnT
6. Replace rear spheres
Have a GnT
7. Replace bottom hose

RobC
BXpert
Posts: 506
Joined: Tue Aug 15, 2006 11:15 am
Location: East London
My Cars: 1991 Citroen BX 16v
x 16

Re: Does the lhm resevoir have any seals?

Post by RobC »

The primary purpose of the seal is to stop dirt getting in. Its secondary function is to stop LHM leaking out too much while it’s sloshing around the tank, but the level of the LHM when the car is in its lowest position and the HP pressure released (ie when as much fluid is back in the tank as possible) should never be above the level of the seal.
1991 Citroen BX 16v

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Jaba
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Re: Does the lhm resevoir have any seals?

Post by Jaba »

The seal and input output manifold is held down by what is effectively a piece of bent metal rod. Is this in place and under tension correctly?

This has got me thinking because mine has always had a slight LHM weep there and I have considered it as normal. If you manage to cure yours with a new seal then I will have to get a replacement too.
The Joy of BX with just one Citroën BX to my name now. Will I sing Bye Bye to my GTI or will it be Till death us do part.

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white exec
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Joined: Sat Sep 12, 2020 4:04 pm
Location: Sayalonga, Malaga
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- LHD, NA, AC, RP_5800
1996 XM 2.5TD Exclusive
2003 Toyota RAV4 2.0 D4D
x 38

Re: Does the lhm resevoir have any seals?

Post by white exec »

Exactly the same arrangement on XM, but a plastic tank.
A new seal (same pt.no. as BX) cured the leak completely.
The metal rod should bear down tightly on the plastic assembly.
Good bit of scope for weepage on that top - lots of return hoses, one here just a push-fit rubber elbow.
Chris

Pcheaven
BXpert
Posts: 163
Joined: Tue Mar 09, 2021 12:34 am
Location: Kent
My Cars: Landrover discovery sport 2020
Previously ipace/discovery 5/velar and many others including 2 bx gti back in early 1990
x 6

Re: Does the lhm resevoir have any seals?

Post by Pcheaven »

Jaba wrote:
Sun Apr 25, 2021 1:18 pm
This has got me thinking because mine has always had a slight LHM weep there and I have considered it as normal. If you manage to cure yours with a new seal then I will have to get a replacement too.
Will let you know when after I have had chance to install and test.

Fingers crossed.
BX Meteor. Sub 20000 miles. Very Original.

ToDo list.

1. ̶G̶e̶t̶ ̶c̶a̶m̶ ̶b̶e̶t̶ ̶e̶t̶c̶ ̶r̶e̶p̶l̶a̶c̶e̶d̶ ̶e̶t̶c̶
Have a GnT
2. G̶e̶t̶ ̶t̶h̶e̶ ̶r̶a̶d̶i̶o̶ ̶t̶o̶ ̶w̶o̶r̶k̶.̶ ̶
Have a GnT
3. Adjust the clutch
Have a GnT
4. Clean LHM tank then a complete flush
Have a GnT
5. Wash, clay bar then ceramic coat paintwork.
Have a GnT
6. Replace rear spheres
Have a GnT
7. Replace bottom hose