Hydraulic pump and pressure regulator - differences

BX Tech talk
KevR
1K Away
1K Away
Posts: 1767
Joined: Mon Apr 12, 2010 8:46 pm
Location: Normandy
My Cars: It's all in my signature
x 4

Hydraulic pump and pressure regulator - differences

Post by KevR » Fri Dec 26, 2014 3:12 pm

Anyone know how to identify a hydraulic pump? Got the chance to buy a new old stock one but it doesn't have a part number I can trace (just a ticket with 460885). Seller says it's a 'five piston' type. RIng any bells with anyone?

Another seller has a pressure regulator (disjoncteur - bit the acc. sphere screws to). Seller says it's for BX but part number is 95 588 683 - which as far as I can make out os for a CX auto. BX part number should be 95 588 682. Anyone know what the differences are (If any?)

All help gratefully received - happy holidays by the way!
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

User avatar
JayW
1K Away
1K Away
Posts: 1590
Joined: Thu Dec 07, 2006 6:40 pm
Location: Now listen here you mullet...
x 13

Re: Hydraulic pump and pressure regulator - differences

Post by JayW » Fri Dec 26, 2014 8:24 pm

AFAIK there are only 2 regulators. With PAS and Without.

Most people identify the pumps based on where the outlet is (i.e. how it mounts). I believe there are different pulley sizes but have never seen any.
I have zero patience for your tedium.

User avatar
Way2go
Over 2k
Posts: 7279
Joined: Fri Jan 13, 2006 3:15 pm
Location: RCoBerkshire
x 2

Re: Hydraulic pump and pressure regulator - differences

Post by Way2go » Fri Dec 26, 2014 10:23 pm

I believe the five piston type is for a car without a fluid diverter valve for the power steering ie not a BX.

Known as a 3+2 (suspension + steering outputs).
Last edited by Way2go on Fri Dec 26, 2014 10:27 pm, edited 1 time in total.
1991 BX19GTi Auto

User avatar
JayW
1K Away
1K Away
Posts: 1590
Joined: Thu Dec 07, 2006 6:40 pm
Location: Now listen here you mullet...
x 13

Re: Hydraulic pump and pressure regulator - differences

Post by JayW » Fri Dec 26, 2014 10:24 pm

Way2go wrote:I believe the five piston type is for a car without a fluid diverter valve for the power steering ie not a BX.
Erm, BX's DO come without PAS & FDV.
I have zero patience for your tedium.

User avatar
Way2go
Over 2k
Posts: 7279
Joined: Fri Jan 13, 2006 3:15 pm
Location: RCoBerkshire
x 2

Re: Hydraulic pump and pressure regulator - differences

Post by Way2go » Fri Dec 26, 2014 10:33 pm

JayW wrote:
Way2go wrote:I believe the five piston type is for a car without a fluid diverter valve for the power steering ie not a BX.
Erm, BX's DO come without PAS & FDV.

But not with power steering directly driven from the pump!
1991 BX19GTi Auto

User avatar
Way2go
Over 2k
Posts: 7279
Joined: Fri Jan 13, 2006 3:15 pm
Location: RCoBerkshire
x 2

Re: Hydraulic pump and pressure regulator - differences

Post by Way2go » Fri Dec 26, 2014 10:35 pm

Double post,oops!! :)
1991 BX19GTi Auto

User avatar
JayW
1K Away
1K Away
Posts: 1590
Joined: Thu Dec 07, 2006 6:40 pm
Location: Now listen here you mullet...
x 13

Re: Hydraulic pump and pressure regulator - differences

Post by JayW » Fri Dec 26, 2014 10:49 pm

Your above statement is now correct with the edit :)
I have zero patience for your tedium.

rutter123
Over 2k
Posts: 2175
Joined: Sun Sep 02, 2012 9:54 pm
Location: South Lincs
x 53

Re: Hydraulic pump and pressure regulator - differences

Post by rutter123 » Fri Dec 26, 2014 11:28 pm

Isnt the 5 piston type for a xantia?
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability

User avatar
Way2go
Over 2k
Posts: 7279
Joined: Fri Jan 13, 2006 3:15 pm
Location: RCoBerkshire
x 2

Re: Hydraulic pump and pressure regulator - differences

Post by Way2go » Sat Dec 27, 2014 12:28 am

JayW wrote:Your above statement is now correct with the edit :)

Post not edited on bit you repled. I only added 2nd sentence showing the split function. :)
1991 BX19GTi Auto

citronut
Over 2k
Posts: 2781
Joined: Wed Oct 31, 2007 7:55 am
Location: EAST SUSSEX UK

Re: Hydraulic pump and pressure regulator - differences

Post by citronut » Sun Dec 28, 2014 9:49 am

there is a 6+2 pump listed under BX on service citroen, not that i hjave ever seen one though

here is the list of all the different BX pumps

95 589 236
NFP
HIGH PRESSURE HYD PUMP
DIAM 120
PETROL

4007 T5
DIESEL FUEL AND 1,905L
PUMP 6 + 2

96 006 983
NFP
1 360L SINCE RPO 04193

95 638 565
NFP
GTI 16S UNTIL RPO 04223

96 034 023
NFP
GTI 16S SINCE RPO 04224

95 589 238
NFP
DIAM 90
DIESEL FUEL

regards malcolm
curent ride
K reg BX 17TD TZD est
also own
K reg D special

no longer have
H reg CX saffari 2.5 TRI (now gone to Malaysia)
R reg xantia 1.9TD est (gone to meet its maker)