turn Citroen CX 1985 1.G Workshop Manual

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-/1
LIST OF OPERATIONS
IN MANUAL 818-1
a CX Petrol )) 7,rhifles
--
-
f-7
i---- _--
-
Operation
number
MA. 330-00
MA . . 344-O
MA. 372-00
MA. 390-00
MA. 390-O
MA. 410-00
MA. 410-O
MA. 420-00
MA. 420-O
MA. 430-00
MA. 430-O
MA. 434-O
MA. ,440-00
MA. 440-O DESCRIPTION GEARBOX and GEARBOX CQNTROL
*O 4
Characteristics and special features of the gearbox
- Four-speed gearbox with pedal-operated clutch
- Gearbox.with torque converter
- Draining and refilling the gearbox and the torque converter
- Five-speed gearbox with pedal-operated clutch
Adjusting the gearbox control mechanism DRIVE SttiFTS
Characteristics and special features of the drive-shafts SOURCE AND RESERVE OF PRESSURE
Characteristics and special features of the source and reserve of pressure -
hydraulic system
Checking the hydraulic components on the vehicle FRONT AXLE
+O 7
Characteristics and special features of the front axle
Checking and adjusting the front axle :
- Checking the camber
- Checking and adjusting the castor angle
- Checking and adjusting the wheel alignment
- Checking and adjusting the steering geometry
- Checking the steering for straight line deviation (
whirfes cjq77ippcJrl with REAR AXLE
*O 8
Characteristics and special features of the rear axle
Checking and adjusting the rear axle SUSPENSION SYSTEM
I,0 9
Characteristics and special features of the suspension system
Checking and adjusting the suspension and its controls
Adjusting the anti-roll bar STEERING SYSTEM
*@
Characteristics and special features of the steering system
- Manual steering
- Power steering with powered return
Checking and adjusting the steering (see Op. MA. 410-O )
Ob
4
Ob 5
Ok 6
Ok 7
O+ 8
O1) 9

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 000 : General characteristics Op. MA. 000 7
CX ,, PRESTIGE ,,‘SALOON
: ( Vehicle equipped with the M 23/623 2350 cc engine )
1. GENERAL CHARACTERISTICS :
- Official symbol MA series MK ................................................................................................................................
- Commercial symbol ........................................................................................................................ CX PRESTIGE
- Factory symbol ( Wurrmzty symbol ) .................................................
:. .............................................
MK
- Introduction date ........................................................................................................................
February 1976
_ French fiscal rating
............................. , ........................................................................................... 13
hp
- Number of seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
NOTE : The following items are standard equipment on CX (( Prestige )) vehicles; VariPower steering ( with
powered return ). Air-conditioning and a (( Froid- 20 1) heater unit. Since December 1976, these vehicles can
be fitted with’a gearbox with torque converter as optional equipment.
Wheels and tyres :
- Wheelrims .,...,._.__._......_...,.................,,....,................................................. . . . . . . . . . . . . . . . 5 l/2 F x 14 FHA
- Tyres ( tubeless ) . . . . . .
(psi) . . . . . . . . . . . . .._.._.......... )
2.2
Authorised alternatives :
-‘Pressure in bars
- Tyres ( .Ppecial equipment) . . . . . . .
185R14 X (M + S ) 185R14X(M+S) 185R14X(M+S)
- Pressure in bars ( psi ) . . . . . . . . . . . . . . . . . . . . 2.2’ ( 32 ) 2.2 ( 32 ) 2.4
( 35 )
I
II. GENERAL DIMENSIONS
Dimensions :
- Front track ......................................................................................................
1.474m (4ft. loins)
- Rear track
... . ................................................................................................... 1.360 m (4 ft. 5 /l/2 ins )
,- Wheelbase ................................... . ...................................................................
3.095m (10 ft. 1 3/4.ins)
- Overall length ............................................................................................. 4.916 m ( 16 ft. 1 /l/2 ins )
- Front overhang ...............................................................................................
1.057 m (3 ft. 5 A/2 ins )
- Overall width ............................................................................................... 1.734m (5 ft. 8 /l/,4 ins)
- Height of vehicle (in normal driving position ) .. :. ..................................... 1.357
m ( 4 ft. 5 /l/2 ins )
- Ground clearance (An normal driving position ) ........................................ 0.155m (9 ft. 6.1 ins)

Downloaded from www.Manualslib.com manuals search engine 1. HYDRAULIC FLUID :
\~ir/~rol 6jr/rol,/ir j111icl ( LHM ) is the only suitable type and must be used to the exclusion of all others in the
hydraulic system of the car.
This LHM fluid is gt~‘~,l
iv c-o/or/~ and similar to engine oil.
The use of nr!~’ oih~~- rc,otll$
twirl the rubber rinqs and seals in the system 2. RUBBER UNITS AND PARTS :
Suitable components are identified by their grcc’r/ colo/~r and may only be replaced by gc~rttri~ro wplor-c~t~~c~nf
col,,pollc,l/fs painted or marked in green.
All rubber components (joints, hoses, diaphragms, etc . . . ) are of a
spvcirfl qtrnlif), ior ~/.SCJ wifh idlfM (Iuid and are
identified by their white or green colour, 3. STORAGE :
ix Components must be stosed /11i1 o/ /Irlirl nr~tl blor~k~rl o!j: Like the piping they must be protected against shock
E and the inqress of dust
7 Rubber tubing and joints must be stored away from dust. air, light and heat.
al
co
0 LHM hydraulic fluid must be stored in its original containers carefully sealed We advise the use of litre ( for
: toppinq up ) or five litre containers ( for refillinq ) to avoid havinq to keep opened containers.
2
2 T-, 4. CHECKS BEFORE CARRYING OUT WORK :
Z +
c
E Before working on the hydraulic system in case of incorrect operation, ensure the following :
a
a a) T/FOI the c-r>ufrol.y or f/l<, rnc~ch~uir~~l livkrrgc~s o/ //I(’ uuits or f/lo gmltp o/ h\~d~c~u/i~ ~~~~it.s in(nln>d are HO/
lt?
sfi]/ it) o/~c,rnfiou.
b) and that the 111’ c-ire-/ii/ is ////(/(jr /~I.(Jss/II.(J. as follows :
With the engine at idling speed :
- Unscrew the pressure-release screw on the pressure requlator by one or one and one half turns : a sound
, of leakage should be heard from the requlator.
= Retighten the release screw : cut-out must occur which results in a reduction in the running noise
emitted by the H P pump.
If not check in the following sequence
- that there is sufficient fluid in the reservoir,
- that the reservoir filter is clean and in good condition,
= that the H.P pump is primed and there is no air leak on the suction side of the pump,
- that the release screw of the pressure requlator is correctly tightened

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 120.0 : Chrrki,,~ the /iminp. Op. MA. 120-O 1
CHECKING THE TIMING.
lototing the crankshah :
) Vebirl~s /i/fed with a mantra~ gearbox :
Lift one of the front wheels of the vehicle, and
engage’ 4th or 5th gear so as to rotate the crank-
shaft,
by means of the raised wheel.
1) Vehicles /itted with n torqee ronrwrter :
Two methods are permissible to rotate the crank
shaft :
- feed the starter “iota from (I &volt battery,
or remove the protective plate under the
converter casing, and rotate the converter
using a screwdriver.
1. Remove :
spore wheel,
cylinder head (carburettor engine 1,
the injection manifold and the rocker cover
(fuel injection engine 1.
2. Bring piston of cylinder No. 4 to TDC. with the
valves in (( rocking position x
NOTE : The TDC mark on engine flywheel co”
be see” at point (( a )) on the clutch housing.
3. Adjust clearance of inlet valve ( 1 ) of No. 1
cylinder to
1.10 mm (theoretical clearance 1.
4. Turn crankshaft exactly one turn in direction of
rotation of engine f m/i-clockwise iro>t! /lyre hpel
side I.
5. Check clearance of inlet valve on cylinder No. 1.
This must be between 0.05
and 0.25 mm.
6. Check and adiust rocker-arm clearance
(engine cold )
Inlet .__....__.............................................,.,, 0.1 5 mm
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.20 mm

Downloaded from www.Manualslib.com manuals search engine ADJUSTMENTS
DESCRIPTION
1st choke
2nd choke MAIN ADJUSTMENT
Venturi bores
...................................................................................
d 23
27
Main jets ................. ...........................
... ................. ... ....... ...............
cl5 115 130
Air correction jets ..............................................................
d 225 190
Emulsion tubes
...............................................................
......
N’ F 21
F 25 IDLING SPEED CONTROLS
Petrol jets
.......................................................................................
d
50 50
Air jets .....................................................................................
(3
100 70
Anti-spill hole ............... ..............................................
....... ........
d 100
Leakage rate past the butterfly under a pressure of 450 mm of mercury
kg; h 2
$2 PROGRESSIVENESS
Staggered holes 3
2 ...............................................................................
u By-pass )) jets (
/irst stnrtiug /row the ho ttott/ J
100 ............................ 1 / 100 cb 80
( SC~COII~ slnrlirrg I.0Nf the bottom )
...................... l/ 1OOd 110 100
( third stnrfiug [row the bottov~ )
........................... l/100($
100 ACCELERATION PUMP
Pump control cam N”
14 850 094 14 850 094 ...............................................................................
Injector ( upper non-weighted type ) ............................................
d 45
Volume of pump - total
cm3 120 -t 0.2
.......................................................................
- partial ( /or r(‘/vre)~Co /~IIr/wS(‘S ) ................... ...........
cm3 0.5 0.7
Outlet tube
200 ................................................. ....... ...........
............... ... d COLD START DEVICE
Return spring for the anti-flooding membrane; 550 g” or 850 g*‘i;
Pressure calibrator for membrane control ...........................................
(1, 40
Return
spring for the clutch flap
180 g ...............................................
Ni 47 600 140
Positive opening’of butterfly under operation of coldstart device
.... d 1.25 2 0.05
Cam for cold-start device
N” 45 200 051
..............................................................
Opening of strangler flap (mensllrcd dt the loIc,cr c,dgc’ ur/dcJT 0 /lI’(‘.sSlI)‘C * 3.5 i 0.25
() j 4(j(J tr ,),, (J ,,, (Jr(-[,q Pin (b
““4 -t 0.25
..... ... .....................................................
... ...... IDLING SPEED CUT-OUT
Electrically operated NG 43840013 ............................................................................. GENERAL FUEL SUPPLY
Float needle
d 1.35
..................................................................................
Two plastic floats 13 F 0.5 ...................................
............... .............................
g.
7 t 0.25
Pre-adjustment setting with float and gasket ...............................
....... mm
Calibration of fuel return to tank .................................
......................... mm 0.8 to 0.9
1
*
W 74-00 only
* + W 69-50 and W 74-50 .

Downloaded from www.Manualslib.com manuals search engine ALL CX VEHICLES
ANTI-POLLUTION SYSTEM ( SWEDISH MARKET )
I - cx 2200 :
The object of the system is to reduce the amount of unburnt hydrocarbons and the amount of CO in the exhaust
( 2 to 3 Z. of CO ) by injecting air under pressure into the exhaust manifold OPERATION :
As the engine rotates air pump ( 1 )supplies the air injectors (4) situated close to the exhaust valves: flap (3)
prevents the exhaust fumes from entering the air pump ( 1 ) and valve ( 2) assembly
There are two cases when it is necessary to stop the injection of air into the exhaust manifold. 1. During deceleration :
During fast decelerations. the mixture becomes richer combustion is incomplete, and the injection of air is
stopped in order 1.0 avoid a second combustion taking place in the exhaust system ( which would result in back
firinq ). During deceleration there is extreme low pressure downstream of the but!erfly ( 8 ). This in turn draws
in for a short period of time the diaphragm in valve (2 )
The air supplied by pump ( 1 ) is released into the atmosphere the calibrated hole u a )) on the diaphraqm
balances the pressure on either side of it, and the diaphragm returns to its initial position, allowinq air to
be once more injected into the exhaust manifold. 2. With the choke out :
With the choke in this position, the quantities of unburned hydrocarbons and CO are very considerable. It is
therefore necessary to stop the injection of air into the exhaust manifold so as to avoid an excessive
increase of temperature in the manifold. With the choke out, lever ( 5 ) connects relay ( 7 ) to earth.
The u WEBER )) electric contact is enerqized The air pressure at the outlet of air pump ( 1 ) increases the
effect of the low pressure on the diaphragm in valve (2 ) ( the air-pressure is felt above the diaphragm and
the low pressure produced by the carburettor (8) is felt below the diaphraqm ) the sliding valve in valve
unit ( 2 ) changes position, and the air is expelled into the atmosphere
If choke ( 5) is pushed back in, air is once again injected into the exhaust manifold.

Downloaded from www.Manualslib.com manuals search engine II. cx 2000
The object of the system is t3 reduce the amount of unburnt hydrocarbons and the amount of CO in the exhaust
( approximately 2 to 3
of CO ) by injectinq air under pressure into the exhaust manifold
OPERATION :
As the enqine rotates air pump ( 12) supplies the air injectors located near the exhaust valves: flap ( 13 )
prevents the exhaust fumes from entering the air pump and air supply duct assembly.
There are two cases where it is necessary to stop the injection of air into the exhaust manifold.
1. During deceleration :
Durinq fast deceleration. the mixture becomes richer combustion is incomplete and the injection of air is
stopped in order to avoid a second combustion takinq
place in the exhaust system ( which would result in
back-firinq ) Durinq deceleration there is extreme low pressure downstream of the butterfly ( 1 ). This in
turn draws in for a short period of time the diaphragm in valve ( 11 )
The air supplied by pump ( 12 ) is released into the atmosphere, the calibrated hole (( a 1) on the diaphragm
balances the pressure on either side of it and the diaphraqm returns to its initial position, allowinq air to
be once more injected into the exhaust manifold
2. With the choke out, for an engine coolant temperature of above 45’ + 3’ C, and whenever the coolant tempe-
rature remains above 35’ i “,I C.
In this situation the quantities of unburnt hydrocarbons and CO are very considerable It ‘is therefore necessary
to stop the injection of air into the exhaust manifold so as to avoid any excessive increase of temperature in
the manifold. On CX 2000 vehicles, injkction of air will be stopped when the enqine water temperature reaches
45” + 3- C Thermal switch ( 8 ) opens, relay ( 9 )
1s no lonqer enerqized. but electro-valve ( 7 ) remains live
( relay lead ). and is earthed via the choke control
The air pressure at the outlet of air-pump ( 12 )
increases the effect of the low pressure on the diaphraqm in
valve ( 11 ) ( the air pressure is felt above the diaphraq,m, and the low pressure produced by the carburettor (2)
is felt below the diaphraqm ). the slidinq valve in the duct chanqes position and the air is expelled into the
atmogphere If the choke ( 10) is pushed back in air is once again injected into the exhaust manifold
DEVICE FOR OPENING THE BUTTERFLY :
The object of the device is to maintain combustion during sudden deceleration up to an enqine speed
of
Nd 7 1800 + 100 rpm.
Durinq deceleration for any enqine speed above Nd, the electronic tachometer housinq ( 6 ) earths the
windinq of relay ( 5) Therefore the H PIERBURG 1) electro-valve ( 4) is no lonqer enerqized. Electro-
valve ( 4) is then under low-pressure, below the diaphragm of the device ( 3 ) for opening the butterfly
When the decreasinq enqine speed falls below
Nd, the electronic tachometer housing (6 ) cuts out the
earth of the winding in relay ( 5) Therefore the (( PIERBURG )) electro-valve ( 4) is enerqized The
electro-valve is no lonqer under low pressure below the diaphraqm of the device (3) for openinq the
butterfly the throttle butterfly returns to it s stop aqainst the idlinq speed adjustment screw. The dia-
phraqm of the device (3) for openinq the butterfly will once aqain be affected by low pressure ( under
the control of the electronic tachometer housing ) once the increasing engine speed reaches
NC ~ Nd t 50 to 250 rpm

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 142-O : Adj,,s/iaji f/a<, rarhnrt,//or Op. MA. 142.0
1
ADJUSTING THE IDLING SPEED
To carry out this adjustment, the following is needed
A tachometer
A device lor checkinq idling speed adjustments on the carburettor ( or on approved gas analyser )
- A CDA 23 checking oppmotus or a workshop test bench ( equipment mentioned in the Equipment and Repair
Materials list, or in the Tools and Equipment notes green notes )
NOTE : WEBER Carburettors ref. No W 54-50, 55-50, 69-50, 74-50 fitted on 1977 models onwards ore fitted with a
fool-proof plug ( white ) on the mixture screw. To adjust the exhaust emission, this plug has to be
removed, and
replaced, after adjustment, with a a Repair PI plug ( black ). See Op. MA, 142-000 for removing and fitting the plug,
and the necessary tools.
ADJUSTMENT CONDITIONS
1.
The idling speed adjus!ment must be carried out on an engine on which the rocker clearances and the ignition
are correctly set. with a clean air filter and
with the engine in good order.
2. Check that the butterflies return fully to their stops.
3. 30 not let pnythinq except the ignition and the engine cooling fan ( or ions ) impose any load on the alternator.
4. Run the engine to bring the
oil temperature up to 70 to 80’ C ( wait for the electric cooling fan ( or fans 1 to cut
in 1.
I. M 20/616, M 22/617, M 23/623 ENGINES I i< ?I< (5 wi/hr ,111 /or<,,,< co,1, <,r,cr or air ro,,di/io,ii?,g I ,I ‘-/
1. Wait for the electric cooling fan ( or fans ) to cut in.
2. Adjust screw (3) controlling the first choke butterfly opening until the following result is obtained : an idling
speed of 850 to 900 rpm.
3. Slowly adjust mixture screw ( 2) to obtain the following result
1.5 to 2.5 “/ of CO
1 7h~se authoris<, 8.7
% or more of CO2 nmbiot~l I~mpcuatur~ 0i 1 Y to 30” C.
4. Adjust screws (3 ) and (2 ) so that both the idling speed and the quantity of CO and CO 2 me correct.
Make sure that mixture screw (2) is adjusted last

Downloaded from www.Manualslib.com manuals search engine 2
OPERATION No MA.IE. 144-00 : Chtiractcristics o/ the e 1,-Jc,tror,ic H clcctroltic
fire1 injc ctiwt systettt.
((L-JETRONIC,,
The H L-Jetronic 1) system is’an intermittent low-pressure injection system which injects petrol into the inlet
manifold.
The system measures the quantity of air drawn in by the engine. which is the main parameter for calculating
the amount of fuel. to be injected. The metering of the fuel is carried out by electro-magnetically triggered
injectors. These are under constant fuel pressure. The quantity of fuel injected is proportional to the duration
of injection. which in turn is optimally determined for any given engin& operating condition by an electronic
control unit ( E.C.U. ) from information supplied by several electric sensors.
One of the principal contributions of the H L-Jetronic H system is the reduction in the level of pollution of the
exhaust emissions.
The (( L-Jetronic v system is made up of the following components :
1
: Electric fuel pump
2 : Fuel filter
3 : Thermal switch
4 :, Double relay
5 : Electronic control unit ( E.C.U. )
6 : Supplementary air control
7 : Pressure regulator
8 : Injectors
9 : Cold-start injector
10. Idling speed adjustment screw
11 : Air-flow sensor ( with incorporated air temperature sensor )
12 : Switch on throttle butterfly spindle
13 : Additional resistors for the injectors (8)

Downloaded from www.Manualslib.com manuals search engine 6
OPERATION No MA.IE. 144 - 00 : Churacteristics o/ the H L-Jetronic )) electronic
/uel injectian .system. FUEL CIRCUIT
A multiple roller-valve pump ( 2 ) draws the fuel from tank ( 1) and provides the injection pressure,
A filter (4) is fitted to the system.
In the fuel return pipe, the pressure regulator ( 3) maintains, under fuel load! a relative constant fuel pressure of
2 bars ( 29 ‘psi ).
The pressure regulator is connected to the intake manifold by a flexible pipe0 This allows the difference of
pressure betw.een the fuel and the inlet manifold to remain constant.Thus the necessary quantity of fuel delivered
by the injectors ( 5) depends exclusively on its duration of opening.