Hydraulic pump O ring size ?

HDI · Unread post by **HDI** » 28 Feb 2011, 17:25

The O ring on the valve which screws into the hydraulic pump has blown on my HDI

Managed to bodge it with PTFE tape temporarily.
Does anyone know the O ring dimensions please ? Will get one from the local belt and bearings place.

Unread post by **DHallworth** » 28 Feb 2011, 18:03

I've got some at home for my XM. If it's the same ones I'm thinking of then the pumps look the same between them.

I'll measure them tonight if I get the chance.

Citroen sell these and my local dealer had them on the shelf. They were less then a quid each from memory.

David.

kenhall1202 · Unread post by **kenhall1202** » 28 Feb 2011, 18:06

Two (of 3) types of O ring listed for the 6+2 pump are 16x1.9 and 19x2.4.

citronut · Unread post by **citronut** » 28 Feb 2011, 19:37

here is part No.'s and dimentions, and there are two diferent sized bungs/plugs in one pump,

4026 87
HYD OIL O-RING
DIAM 16-TO 1,9
- PRESS PUMP 6+2 + NON-SINKING

4026 86
HYD OIL O-RING
DIAM 19-TO 2,4
- PRESS PUMP 6+2 + NON-SINKING

and here is part No. and price

Part Number Description Quantity Price excl. VAT Price incl. VAT Total incl. VAT Selection
0000402688 HYD OIL O-RING 1.16 GBP 1.39 GBP 1.39 GBP

0000402687 HYD OIL O-RING 1.36 GBP 1.63 GBP 1.63 GBP

regards malcolm

HDI · Unread post by **HDI** » 28 Feb 2011, 21:46

Thanks guys

Xaccers · Unread post by **Xaccers** » 28 Feb 2011, 22:16

When you say valve, do you mean the 17mm hex which the pipe comes out of?
If so, get two of the o-rings and replace the one under the similar blanking plate further around the pump.
You could also get the large o-ring that goes between the pump and the powersteering bell end and replace that.

HDI · Unread post by **HDI** » 01 Mar 2011, 09:41

Yes, that sounds like the one except it's a 19mm hex. The main pressure feed does take off from it.
There is a bit of a story behind the problem. The original O ring started to cause a slight leak and I replaced it with one from my assortment box, but I don't think the size was quite right hence the subsequent failure.

Xaccers · Unread post by **Xaccers** » 01 Mar 2011, 10:20

Thought I was wrong with saying 17mm

Get theco-rings from the dealer as they're so cheap

HDI · Unread post by **HDI** » 01 Mar 2011, 10:33

My local dealer would never have them in stock, they no longer even stock LHM !!!
There is a local belt and bearing place that sells this sort of stuff, from experience I know they will will be about £0.40 each !

citronut · Unread post by **citronut** » 01 Mar 2011, 12:48

trouble is useing any old O ring they might not like diesel fuel, so i think it is better to use one from citroen,

regards malcolm

HDI · Unread post by **HDI** » 01 Mar 2011, 15:01

It's on the hydraulic pump not the diesel pump, but it's ok, nitrile O rings will resist either.

citronut · Unread post by **citronut** » 01 Mar 2011, 19:02

sorry what was i thinking

regards malcolm