1981 Citroen CX ECU

Downloaded from www.Manualslib.com manuals search engine a OPERATION N’ MA. 410-O : (./~rrkiq N,,I/ VI. CHECKING AND ADJUSTING THE STEERING GEOMETRY
The crossmember supporting the steering has slots at its fixing point on the front subframe.
Any vertical movement of this crossmember alters the steering geometry.
WARNING
This operation is only to
be carried out in certain ccxses such as
-accidental impact, with repercussions on the steering system.
-work on the vehicle entoiling removal of steering crossmember.
- vehicle with poor
road stability ( p oar stright-line stability) 01 with excessive tyre weor.
CHECKING
1, Prepare the vehicle. as for checking front wheel
alignment ( Srr ~ho/,lvr
V I.
NOTE
A ) \In,,unl ~fi~<,r;,,~ I chiclvs :
With the steering in the /< straightahead 1)
position. lock the steering using CI commercially
available tool ( FACOM _ MULLER -WILMONDA)
B) PO,, P)’ \,r,rr;ng r’cliirl<,.s :
Do not actuate steering wheel during check
( hydraulic locking of rock 1.
As a precaution. a steering wheel iocking
tool may also be
used. 2. Mark position of vehicle in relation to
ground :
Secure a weighted length of string to the front
bumper. and
mark the position of the weiqht on
the ground ( The
object of this is to always bring
the vehicle
bock to the some position in order to
carry out correct measurements 1.
NOTE Other procedure
This check having to be carried out wheel hy wheel.
it is possible to use the free projector.
Secure projector to scuttle panel crossmemher, and
focus it onto a fixed object, which will indicate the
initial positioning of the vehicle.
3. Measure the variation in the wheel alignment wheel
by wheel, ds o function of the height of the vehicle.
a) From Ihc m~nwnl rlri,:ir,g posi/ior, lo /hc hi@
posilio,, f ftouad 1 :
With vehicle in mwmal rlriving position.
engine running ond position marked in relation
to groond :
Mark position of luminous spot on front graduated
rule.
Place m’anual height control lever in hi&
posilirrrl.
and wait for vehicle to stabilize.
Check and adjust if necessary position of vehicle
in relation to ground. ( II
eight 01 Inmbrous spol
ou /i wd 0 hit,< I J.
Mark position of luminous spot on front graduated
rule. and on rear one
1) Front and rear readings ore the some (no
variation in alignment in the wheel 1.
NOTE : The reading f I,i$ or lorr posilios J
on the qroduated rules differs from the initial
reading f non,,nl >r,nrlinl:
position J because
the front track has altered.
2) Front and rear readings ore different ( in this
case the alignment has oltered,.either in
toe-in or toe-out ).
0 to 1 mm toe-in is permissible on either wheel
b) ,:rr ,,I, /bv IIDIINRI hi&g ,,osi,;orr lo ,I,<, lo,,
posiliov f Hrlmuad ) :
Proceed OS for previous measurements, place
manual height control lever in low position. In
this case. the permissible difference in oliqn-
ment
is O.to 1 mm toe-out.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 4104 : (./ , k’ 1<, jr.or,/ ovl<, ,,i,it Op. MA’. 410-O 9
ADJUSTMENT
NOTE The steering crossmember will have to be
moved (IS a function of the readings obtained during
checkinq
01) Towards the top to
obtain
_ toe-out ir, Ihe hish positim
- toe-in irr the 10~ psitios
b) Towards the bottom
to obtain
.
toe-in in Ihr hi& posilins
- toe-out iu fhc IOU posilios
4. Remove the rubber shields ( 1 ) from the wheel-
arches.
5. On each ,upper wheelorm spindle (2 ). position
tools 6451-T, screw (3) resting on steering
crossmember ( 4 1.
NOTE.
6. Slacken nut ( 5) and screw (6 1 securing the wind-
screen crossmember. on the side to be moved.
Slacken the upper fixing nut on the opposite
side as well li,r order 10 nrmoid rlistorfina II><,
crr~.ss,nP”,b<~r ,,
7. Move the crossmember in the direct& decided,
by using (1s a mark extremity (( a u of screw ( 3).
8. Tighten ‘the fixing nuts and the screw for the
crossmember. Tightening torque : 2.5 ta 2.8 doNm ( 18 ta
20 l/2 ft.lb ).
9. Check once mew the variations in wheel aliqn-
merit. and alter the position of steering cross-
member. if necessary. 10.
Remove tools 6451-T and fit the rubber shields
to the wheelarches.
Adjust if necessary. 11.
Check the toe-in of the front wheels 1 to 4 mm.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 430.00 : c ,,<,,a< ,<,r;s,;rs mi/ .s/wrin/ ,vn/srrs oi /he srmf~rw.~ion Op. MA. 430-00 5
II. SPECIAL FEATURES
Adjusting the anti-roll bars :
A, t/xv ,ms,
- Lateral positioning equal protrusion on either side to within 2 mm
- Anti-roll bar bearing preload 300 N ( 30kg) ( 66 lb )
- Lateral clearance of anti-roll bar. under pressure of 500 N i 50kq I( 110 fb i 0.2 to 1 mm
,I, l/X“ rcnr :
- Lateral positioning same thickness of shim on both sides. within 1 mm
- Shimming, if necessary. level with the split collars to within 0.6 mm
Greasing of the suspension piston con-rod ioint :
( Carried out with LHM liquid contained in the dust cover )
- Front suspension cylinder
- Rear suspension cylinder
Upper front wheelarm stops :
WARNING ‘,hc ,,,;,,,i<~, ~,op ,,,I (i, he ii,,, r/ 01 //I< ,,I?<,<‘/ wd. 7cm3
25 cm3
Tightening torques :
- Anti-roll bar link-rod on upper wheelarm. i Bush nut 3 doNm ( 21 11 2 ft.lb )
NYLSTOP nut 4.5 to 5daNd32 1/‘2to 36ft.lb)
- Link-rod on anti-roll bar 4.5 to SdaNm(32 1/2to36ft.lb)
. Screw securing front anti-roll bar bearing 2.7 daNm ( 19 l/2 ft.lb )
^ - Clamps for adjusting pie-load on front anti-roll bar 13 doNm ( 9 l/2 ft.lb)
b2 - 1.5 daNm [ 11 ft.lb i
0 Clomp for height corrector control
rod ( front and rem )
”
6 daNm ( 43 l/ 2 ft.lb ) - . An+iwroff bar 0” rear &&arm ( rear fixing
points ) I /nc<’ nvrl /hrcn,l~r &
- Rear anti-roll bar split collars :
cc
-5 Tightening torque for screw ( 1 )
according to width (e) of bearing :
:
2
e = 5 mm 8 d.aNm ( 58 ft.lb ) f -I’, I’JiS,
P
e-6mm lOdoNm( lOft.lb)i 121Vi-’
Fitting of the front and rear wheelarm stops using water
Fitting of the front anti-011 bar bearing shells using ,< TOTAL MULTIS I) grease.

Downloaded from www.Manualslib.com manuals search engine ll, SPECIAL FEATURES
STEERING PINION
After adjusting wheel alignment, protrusion of track-rod thread in relation to lock-nut must be equal on either side
( .to within 2 mm )
Rack centre-point Protrusion of rack must be equal on either side of rack housing
- Clearance at rack plunger ( at minimum clearance point ) .O.l to 0.25
( at minimum clearance point ) ., .,...._...... .._._ 0 1 to 0.25 mm
- Rotational torque of pinion, after
adjustment of plunger .._..... .._.... 1.2 daNm ( 8 l/2 ft.lb)
L 44.3
Steering control :
- Clearance between universal joint, steering shaft and fixed
steering wheel tube spacer 0.25 to 1 mm
.._....__._..._.... ._..__..
- Position of steering wheel spoke in (( straight-ahead ))
position. single spoke pointing vertically downwards
- Angle of universal joint : 17” to the left approx. (with steering
wheel in (( straight-ahead )) position.
- Coupling for steering pinion flange ( steering shaft ) ....................................
- Flange on steering pinion ................................................................................
- Steering pinion securing flange ........................................................................
- Steering rack ball joint f rack Jacked )’ .............................................................
- Track-rod lock-nut ..............................................................................................
- Rack housing on steering crossmember ..........................................................
-. Steering crossmember on front subframe ..........................................................
- Nut for track-rod ball-joint ................. ................................... ..... ...................... Tightening torques :
- Flange for universal joint on steering shaft __..._.__.._._.........,.........................,. 1.3 to 1.4 daNm ( 9 11 2 to
lOft.lb)
- Fixed steering wheel tube attachments
. . . . . . . . . . . . . . . . . . . . . 1 9 to 2.1 daNm (13 l/2 to15ft.lb)
3.1 to 3.4 daNm (22 l/2 to 241/2ft,lb)
1.3 to 1.4 daNm ( 9 l/ 2 to 10 ft.lb)
1.3 to 1.4 daNm (9 l/2 to 10 ft.lb)
.5 to’5.5 daNm (36 to 40 ft.lb)
3.6 to 4 daNm ( 26 to 29 ft.lb)
2.5 to 2.8 daNm ( 18 to 20 l/2 ft.lb)
2.5 to 2.8 daNm (18 to 20 1/2ft.lb)
9 to 10 daNm ( 65 to 72 l/2 ft.lb)
- Greasing of steering rack TOTAL MULTIS MS

Downloaded from www.Manualslib.com manuals search engine Op. MA. 440.00 11
2. SPECIAL FEATURES
a) Centre point of steering rack :
Insert roll-pin ( 1 ) ( dio -: 6.5 mm ) in the
steering pinion when ihe wheels are appraxi-
mutely in the GG siroightohead )B position.
b 1 Track rods :
Positioning of flexible links
4J
a c) Positioning steering-wheel spoke :
2 Link rod spindle
3 Fixing point of rock housing on crossmemker
In the C( straight-ahead )) position, the steering-wheel spoke must point vertically
downwards
d) Positioning the collars on the wheel alignment
adjustment sleeves ---
FRONT
e) Tightening torques :
- Steering-wheel fixing nuts ..,.,........,......,.. .., 6 to 8 daNm ( 45 li 2 to 58 ft.lb j
- Screws securing control nut on body-shell 2.1 daNm ( 15 ft.lb )
. Screws securing steering shaft to coupling flange ,.,,.,,,,,.,.,.,,, 2.7 doNm ( 19 li2 ft.lb )
- Nuts securing flexible block on rack C rnrh lorkc~d iu psi/h) 5.5 doNm ( 40 ft.lb )
-Securing collars for wheel olignmani adjusting sleeves 0.9 daNm ( 6 l/2 ft.lb )
NOTE Unspecified tightening torques are the same as for the manual steering

Downloaded from www.Manualslib.com manuals search engine BRAKE VALVE
B. 45-8 a
Overflow return Rear brakes Front brakes
1. Snap ring
2. Spring
3. 1’ 0” ring
4. Plug
5. Thrust washer
6. Rear slide-valve
7: Front slide-valve
8. Spring
9: Thrust cup
10. Circlip
11. Rubber protective sleeve
12. Securing bush
13. Snap rings
14. Rubber damper
NOTE If the brake valve is not fitted with an external overflow return, it is incorporated in the operational
return ( Return to reservoir ).
WARNING Three types of brake valve fitted with a single return system incorporated in the operational return
have been used.
= is/
/it/i//g brake valve painted green with overflow pointing upwards
= _)IIII
fi/tirlg : brake valve with green paint mark, and overflow pointing downwards
_ i1.d
/it/i,l~q’: brake valve with green paint mark on L H side and overflow pointing downwards
I. CHARACTERlSTlCS
Main braking system :
- Disc brakes on all four wheels with r~u/iln/ct/ tlisrs at the front ( Sn/oo//~ I
front and rear ( I:sIN/~ s i
- Four pistons per brake unit. at the front
- Two pistons per brake unit, at the rear
- Power operated hydraulic control ( brake valve incorporated in system )
z The front braking system is supplied by the main accumulator ( c,~l~icI~~.s
rli/ll vrn~l//~/ SIC criug J or by the
the brake accumulator ( I’orr,< J’
s/ccrivg rc,/~iclc,s 1.
- The rear braking system is supplied by the rear suspension. and is fitted with a brake pressure limiter cn
I:SIUI(J vehicles
-
The inner half-unit at the front is in one piece with the swivel.
- The outer half-unit at the front is removable.
Handbroke ( Emergency brake ) :
w
Independent from the main braking system.
- Two independent brake pads acting on front discs.
- Ratio
- cx 2000 - 2 197 j ___._....._..._..._.........,............................................................................... 101 1
- All CX vehicles 2 1’j75 -
. . . . . . 123 1
Total braking area :
- Main braking system : 316 dm2 - 48.98 sq.in ( Snloor~s ) or 365 cm2 - 56.57 sq.in f f:sfrffcss )
v
Handbrake ( emergency brake ) 49 cm2 ( 7.59 sq.in )

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 450-00 : Ch nrnclcrislics ortd sp~~c-i~l (c~c~trlrc>s 01 the hokiug S SI~IN Op. MA. 450.00 5
A brake pressure limiter is fitted to the rear braking system on Estate vehicles.
Its object is to vary the maximum
pressure in the rear braking system as a function of the load imposed on the rear suspension and the pressure in
the front braking system. It is secured horizontally on the front subframe, behind the safety valve.
L 45-6
Rear brakes Air-chamber
A
Front brakes
Rear brakes Air-chamber
A A --
7 Front brakes OPERATION
* I
f Vchtclcs - ‘I/]‘,?(, i
The brake pressure limiter consists mainly of a
slide-valve, the positions of which allow or do not
allow the supply of fluid under pressure from the
brake valve to the rear brakes.
The ends of this slide-valve are submitted to the
action of two forces
- Force F
exerted by the fluid under pressure in
the rear suspension.
= Force R
exerted by spring ( 1 ) and increased by the
value of force Fl
exerted by the front brake fluid
pressure during braking action.
a) \‘~~I~i~-/~~s irt Ilte t( lorl r /tr,.silioti f t/o /trc~.s.surc’ )
Under the only force R,that of the spring. slide-valve
is in the position indicated in figure 1. The fluid
cannot pass from the brake valve to the rear brakes,
( and vice-versa ).
Force
F exerted by the rear suspension pressure
is greater than Force R
exerted by the sprinq.
The slide-valve is in the position indicated by
Figure 2. which allows flow of fluid from brake
valve to rear brakes ( and vice-versa ).
c ) Vvhiclc il2 ntotior/. rr,ith 111~’ broke pednl ncl~~fit~~c/ :
Fluid from the front brakes exerts a Force Fl
which is added to Force R exerted by the spring.
When these two forces are smaller than force F,
slide-valve is in position shown in Figure 2.
The rear brakes are supplied.
When these two forces are greater than Force
F,
slide-valve is in the position shown on Figure 1.
The rear brakes are not supplied.
NOTE Fl
+ R -b F is true, when the pressure
in the front brakes + 28 bars ( 406 psi ) becomes
greater than the’pressure in the rear suspension.
When F
increases, Fl increases. Consequently,
maximum pressure in the rear brakes increases.
In order to avoid a sudden cut-out of the supply
to the rear brakes, a ball-valve slows the flow
of liquid from the front brakes. The action of this
valve is increased by the fact that an air-bubble
trapped in its chamber, secured at the rear of the
front subframe upper.crossmember on the L.H. side,
has to be compressed. Once the slide-valve has
started moving, the supply of fluid is not slowed
down, and it then flows through the by-pass channel.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 450-00 : (:/~ornc.t(,ris/i(- c/r/d ,S/ICJC inl /c,c//r~rc,s ot the brcrkillg s~‘.stc~rt~ Op. MA. 450-00 9
Handbroke ( Emergency broke )
- Thickness of the lininq on one pad
4.15 mm _...... .._.......... _.. .,..........
- Type of lining .__............................._....._._..... .._.... .._.. .._.
TEXTAR T 270
- Area of one pad
._..
12 cm2 ( 1 86 sq in )’
- Adjusting the -pads the pads must just contact the disc at its highest points.
Tightening torques :
- Flexible brake pipe on front brake unit tube .............. ..... ....... ........... ........ 3 6 to 4daNm (26 to 29 ft.lb )
- Nut securing front brake pipe on subframe .................................................
2.1 to 2 4daNm (15 to 17 1/2ft.lb )
- Brake valve securing point .................. .............................. ........... ........ 1 8 daNm ( 13 ft.lb )
. Pedal assembly securing point .....................
...... ..................................
0 5 daNm ( 3 l/2 ft.lb )