Xantia Lhm pump leak

[kilianmanning]

Hi guys.
First time poster here.
I have a 96 xantia 1.9td hatch with a leaking lhm pump.
The leak is coming from the bottom bolt/union on the lhm pump. An o ring is fitted on the union but my car keeps shredding the o ring after a few days driving.
Would anybody have any ideas?

I'll put up pictures later if needed.
Thanks

[citronut]

hi and welcome

are you fitting O rings bought from citroen, or just stranded O rings,

if the later try the proper citroen O rings

here is part No.'s and dimensions of the two different sizes in one pump

4026 87
HYDRAULIC OIL O-RING SEAL
DIAM 16-TO 1,9

4026 88
HYDRAULIC OIL O-RING SEAL
DIAM 19-TO 2,4

and price and part No.


Part Number Description Quantity Price excl. VAT Price incl. VAT Total incl. VAT Selection
0000402687 HYD OIL O-RING 1.35 GBP 1.62 GBP 1.62 GBP

0000402688 HYD OIL O-RING 1.15 GBP 1.38 GBP 1.38 GBP

[VertVega]

O-ring must be type NBR (Nitrile butadiene rubber) which is LHM compatible.
Try the ones given in citronut's message.

[kilianmanning]

OK thanks guys.
I am just using standard o rings at the moment.
I will get the proper o rings from Citroen & see does that solve the problem.
Does anybody know which of those two sizes of o ring I need?

[VertVega]

The leak is coming from the bottom bolt/union on the lhm pump.

Then it must be the size --- DIAM 19-TO 2,4
I would suggest you to buy both sizes (DIAM 19 and 16) as spare parts.
They don't cost a fortune and you can't find them easily.

Total amount of O-rings of both sizes in Hydr.pump:
- 2 pcs O-rings 19 x 2.4
- 6 pcs O-rings 16 x 1.9

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

[kilianmanning]

The leak is coming from the bottom bolt/union on the lhm pump.

Then it must be the size --- DIAM 19-TO 2,4
I would suggest you to buy both sizes (DIAM 19 and 16) as spare parts.
They don't cost a fortune and you can't find them easily.

Total amount of O-rings of both sizes in Hydr.pump:
- 2 pcs O-rings 19 x 2.4
- 6 pcs O-rings 16 x 1.9

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

Ok thank you, I'll get a packet of each

[citronut]

The leak is coming from the bottom bolt/union on the lhm pump.

Then it must be the size --- DIAM 19-TO 2,4
I would suggest you to buy both sizes (DIAM 19 and 16) as spare parts.
They don't cost a fortune and you can't find them easily.

Total amount of O-rings of both sizes in Hydr.pump:
- 2 pcs O-rings 19 x 2.4
- 6 pcs O-rings 16 x 1.9

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

this is the only other pump seal shown on service citroen, and i cant find a seal kit

4026 86

HYDRAULIC OIL O-RING SEAL
44,2T3
- INJECTION XU5JP
44,2T3
- INJECTION XU7JP
44,2T3
- INJECTION XU7JB
44,2T3
- INJECTION XU7JP4

and here is price and part No.,

it shows 1 required

Part Number Description Quantity Price excl. VAT Price incl. VAT Total incl. VAT Selection
0000402686 HYD OIL O-RING 2.55 GBP 3.06 GBP 3.06 GBP

[citroyiannis]

The leak is coming from the bottom bolt/union on the lhm pump. An o ring is fitted on the union

...
Hi citroenians,
Its all right with all those O-rings and their part numbers. But what about the O-ring inside the HP front union which is next to the pulley? The official Citroen site dose not give any part number for it neither a part!

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

This one: 44 x 2.3 (Citroen spec.:44,2T3) has the part No: 4026 86, and I suppose is for the "bottom HP union" which killianmanning ask for.
Whats the part number of the other one (36 x 2.5) you mention here? Is it for the front union? Where can we find some of this?
I need some for HP pumps: 4007 T9 (XU10J4R/XU10J2TE) and 4007 T4 (XU7JP4).
Regards,
Yiannis

[citronut]

The leak is coming from the bottom bolt/union on the lhm pump. An o ring is fitted on the union

...
Hi citroenians,
Its all right with all those O-rings and their part numbers. But what about the O-ring inside the HP front union which is next to the pulley? The official Citroen site dose not give any part number for it neither a part!

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

This one: 44 x 2.3 (Citroen spec.:44,2T3) has the part No: 4026 86, and I suppose is for the "bottom HP union" which killianmanning ask for.
Whats the part number of the other one (36 x 2.5) you mention here? Is it for the front union? Where can we find some of this?
I need some for HP pumps: 4007 T9 (XU10J4R/XU10J2TE) and 4007 T4 (XU7JP4).
Regards,
Yiannis

[citronut]

This one: 44 x 2.3 (Citroen spec.:44,2T3) has the part No: 4026 86, and I suppose is for the "bottom HP union" which killianmanning ask for.

no this 44mm O ring fits between the twi pump body half shells,

the leak killianmanning talks about, i belive will be repaired by one of these two O rings, not sure which one 16mm or the 19mm

4026 87
HYDRAULIC OIL O-RING SEAL
DIAM 16-TO 1,9

4026 88
HYDRAULIC OIL O-RING SEAL
DIAM 19-TO 2,4

Whats the part number of the other one (36 x 2.5) you mention here? Is it for the front union? Where can we find some of this?
I need some for HP pumps: 4007 T9 (XU10J4R/XU10J2TE) and 4007 T4 (XU7JP4).
Regards,
Yiannis

i cant find the part or No. for the 36mm O ring now,
but service citroen does not show rhe front end seal/O ring,

i remember having a conversation with Martin at Pleiades regarding the front end seal,
he said the OE seal is not available from citroen, and when he reconditions these pumps, he makes/has made a new metal front plate which uses a seal/O ring he source's from a different supplier,

were as the orihinal face plate is plastic which cracks

[VertVega]

The leak is coming from the bottom bolt/union on the lhm pump.

Then it must be the size --- DIAM 19-TO 2,4
Total amount of O-rings of both sizes in Hydr.pump:
- 2 pcs O-rings 19 x 2.4
- 6 pcs O-rings 16 x 1.9

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

citroyiannis, the text "and for a complete overhaul of pump these are also needed:" was originally sent by me. I got this information from another site and saved it in my computer but I don't remember the original source.

As citronut also written, probably the leaking seal type is either #4 (diam 16) or #5 (diam 19) in kilianmanning's Xantia.

I used to have a Xantia 2.0i 16V and below pic is same type as in my car.

The unlisted O-ring seal is number 6. It is not included in the citroen diagrams. I think it is an ordinary seal (not NBR) because there is a bearing there and I guess it does not have any contact with LHM. You don't necessarily need to change it if it is in good condition.

[kilianmanning]

I have 5 of 402688 & 402687 ordered.
Thanks for all the help guys hopefully i'll be motoring again soon

[citronut]

The unlisted O-ring seal is number 6. It is not included in the citroen diagrams. I think it is an ordinary seal (not NBR) because there is a bearing there and I guess it does not have any contact with LHM. You don't necessarily need to change it if it is in good condition.

Vert
i would say the front seal must have contact with citro blood, as when the pump leaks from the front end it is the green blood weeps from there

[aneesh84]

If I want to just change seals 4 and 5, is it a pump out job? Some of the seals at the bottom are leaking. The leak isnt too big but everytime i put my fingers there i find it oily and i am worried it might damage the alternator.

If its a pump out job, then i might as well replace all of them as a preventive maintenance.

[Renanek9]

The leak is coming from the bottom bolt/union on the lhm pump.

Then it must be the size --- DIAM 19-TO 2,4
Total amount of O-rings of both sizes in Hydr.pump:
- 2 pcs O-rings 19 x 2.4
- 6 pcs O-rings 16 x 1.9

and for a complete overhaul of pump these are also needed:
- 1 O-ring 44 x 2.3
- 1 O-ring 36 x 2.5

citroyiannis, the text "and for a complete overhaul of pump these are also needed:" was originally sent by me. I got this information from another site and saved it in my computer but I don't remember the original source.

As citronut also written, probably the leaking seal type is either #4 (diam 16) or #5 (diam 19) in kilianmanning's Xantia.

I used to have a Xantia 2.0i 16V and below pic is same type as in my car.

The unlisted O-ring seal is number 6. It is not included in the citroen diagrams. I think it is an ordinary seal (not NBR) because there is a bearing there and I guess it does not have any contact with LHM. You don't necessarily need to change it if it is in good condition.

Hello Guys.. Sorry for digging up this thread

Would the "unlisted O-ring seal" be this one?

I'm having trouble finding this one. It NEVER appears on any overhaul diagrams for this pump.

What I have (and is found everywhere) is:

6x 16mm diameter O-rings, thickness1.9mm. REF. 402687
2x 19mm diameter O-rings, thickness 2.4mm. REF. 402688
1x 44.2mm diameter O-rings, thickness 3mm. REF. 402686

1x O-ring 36.17 x 41.41 x 2.62 - NBR90
1x A double lip seal type SPI gasket Double lips OAS - 15 x 24 x 7 NBR

But nowhere can I find this one from my photos. Can you help me?

By the way, it looks A LOT like the spheres retaining gaskets! lol