Suspension strut, 27mm top nut, driver's side

Selling off one (or bits :o) of your XM collection, or perhaps searching for those elusive headlight washer covers? This is the place to do it.
xmexclusive
Global Moderator
Posts: 5925
Joined: Wed Apr 15, 2009 8:11 am

Re: Suspension strut, 27mm top nut, driver's side

Post by xmexclusive » Sun Jul 28, 2019 12:19 pm

The Mk2 struts and strut heads are a little more complex than described above.
The cut over to the thicker strut rods and matching heads was by Mk 2 model starting in 1994 with the 2.5 only.
The model changes to thick rod were progressive and are I believe not correctly documented in the parts records.
That is why the physical check of strut rod thickness/taper size is so important on all Mk 2 models except the 2.5TD.
The later change of strut head at ORGA 7321 was a significant Citroen redesign applied to all strut heads then in production.
It involved a deeper protrusion of the gaiter ring into the wheel arch and a new shorter gaiter to match.
This change increased the structural rubber contact area by around 10% presumably in response to rubber tearing failures.
There was no change in the rods, tapers and oilways so there were no new restrictions on combinations that would fit together.

John

Lwdajo
Has changed a sphere or two
Posts: 251
Joined: Thu Mar 01, 2018 11:50 am

Re: Suspension strut, 27mm top nut, driver's side

Post by Lwdajo » Sun Jul 28, 2019 4:05 pm

Thanks to you both. I still need to check my 1994 car to see what struts I have there (it's not at home).

If I understand what you are saying, John, the replacement strut top on the drivers side of my 1998 car (from a 2.5L it seems) may still not match the one of the passenger side? The car is still with the garage, so I am unable to check that either.

Can you describe how to determine the differences in taper?
Citroen XM 2.1TD 1994 Mk2 - M21 CXM

xmexclusive
Global Moderator
Posts: 5925
Joined: Wed Apr 15, 2009 8:11 am

Re: Suspension strut, 27mm top nut, driver's side

Post by xmexclusive » Sun Jul 28, 2019 5:19 pm

No, What I was trying to say was:-

THICK STRUT ROD/LARGE DIAMETER TAPER
All the thick strut rods have the same taper, same position oilway holes and same thread for the nut at the top.
So they will all fit any design of large hole strut head.

THIN STRUT ROD/SMALL DIAMETER TAPER
All the thin strut rods have the same taper, same thread for the nut at the top.
So any design of small hole strut head will physically fit but oilway holes varied during XM production.
So there are rules and prohibitions about which small hole strut head is permitted with the two types of thin strut rod.

ALL STRUT HEADS have the same chassis fitting so will fit any type of XM.
ALL STRUT CYLINDERS have the same bottom fixing so will fit any XM.
So if a second hand strut and head of the correct hand are recovered as a pair that assembly will fit any other XM.

The easiest way to check the taper is to measure the diameter of the parallel part of the strut rod.
THICK STRUT RODS are 25mm diameter.
THIN STRUT RODS are 23mm diameter.

Strut head TOP HOLE Diameter.
To match THICK ROD taper 20mm dia.
To match Thin ROD taper 18mm dia.

John

xmexclusive
Global Moderator
Posts: 5925
Joined: Wed Apr 15, 2009 8:11 am

Re: Suspension strut, 27mm top nut, driver's side

Post by xmexclusive » Sun Jul 28, 2019 5:36 pm

With difficulty I got to the Sphere testing work bench.
Found four struts to compare.
3 were XM and one C5 or Xantia.
Only one of the XM ones was thick rod.
Visual examination suggests the XM struts have a symmetrical welded fixing for the drop link.
I decided that two small features determine the handing of the strut cylinder.
The leak off oilway hole is offset to one side of the drop link fixing.
There is a thin vertical welded ridge on the clamp base of the strut cylinder.
This ridge matches small vertical chamfers on the edges of the bottom steering clamp.
Aligning the strut ridge correctly fixes the position of the top of the drop link.
The thick rod recovered one is a passenger side strut probably from a 2.5TD.
(Leak hole to the left Drivers side RHD).
(Leak hole to the right Passengers side RHD).

John

Lwdajo
Has changed a sphere or two
Posts: 251
Joined: Thu Mar 01, 2018 11:50 am

Re: Suspension strut, 27mm top nut, driver's side

Post by Lwdajo » Sun Jul 28, 2019 6:04 pm

Thanks for all your help - I've printed and am storing that information with the struts.

Lee
Citroen XM 2.1TD 1994 Mk2 - M21 CXM

Dieselman
Global Moderator
Posts: 13734
Joined: Thu Jun 18, 2009 6:44 pm

Re: Suspension strut, 27mm top nut, driver's side

Post by Dieselman » Sun Jul 28, 2019 6:50 pm

xmexclusive wrote:
Sun Jul 28, 2019 5:36 pm
There is a thin vertical welded ridge on the clamp base of the strut cylinder.
This ridge matches small vertical chamfers on the edges of the bottom steering clamp.
Aligning the strut ridge correctly fixes the position of the top of the drop link.
John
I always thought that ridge was just accumulated dirt and corrosion, not a fabricated location line.
I'll clean one up and have a proper look.
As noted, the leak off port is forward of the ARB link bracket.
92 2.1SED M.RP5740 ECZ Sable Phenicien
92 3.0 V6-24.Rp 5713 EXY Black
92 2.1SD M.RP 5685 ENT Blue Sideral
Prev
90 2.1SD M.RP 5049 EJV Mandarin
92 2.1SD A.RP 5698 EJV Mandarin
94 2.1SD A.RP 6218 ERT Triton Green
91 2.0SI M.RP 5187 EWT White

citroenxm
Global Moderator
Posts: 9981
Joined: Wed Apr 15, 2009 9:11 am
Location: North Wales - FAR far far away!!! :-p

Re: Suspension strut, 27mm top nut, driver's side

Post by citroenxm » Fri Aug 02, 2019 8:37 pm

All struts have a ridge or locating part at the base of a strut.. Not just citroen but any mcpherson strut car so the strut fits in the hub correctly sided.. And can't be 90deg 100deg or whatever rotationally out of line..
Projects:(eventually if theres any bodywork left)
93 L Xm 2.1t D auto project
93 L xm V6 12v Sei Manual

Others
In use.. 1995 M reg S2 2.1td auto exclusive

Post Reply