Citroen CX 1985 1.G Workshop Manual

Downloaded from www.Manualslib.com manuals search engine 2 OPERATION No MA. 173.0 : C/ l<,C ,,,g //JP p/r”/ SuppI) k’
CHECKING THE PETROL PRESSURE USING APPARATUS 4005-T
Install apparatus 4005-T as shown above.
Disconnect reservoir return line from the carburettor and fit plug A on by-pass union ( 1 1.
Unscrew knurled knob B by approximately one and a half turns.
Start the engine
a) Check pressure of petrol at nil output :
b
c -Fully screw down knurled knob B and read the stabilized pressure on the pressure gouge which should
be 325
mbors ( 47 psi ) maximum.
Check the proper sealing of the pump return valve
-Stop the engine. There should be no sudden drop in pressure
Check the proper sealing of the carburettor needle valve :
- Unscrew knurled plug B and start the engine. Let it run for a few minutes.
-Stop theengine.
There should be no sudden drop in pressure.
= Remove apportus 4005=T and fit to carburettor the tank supply and return pipes (after having removed plug A 1:
CHECKING THE PUMP FOR LEAKS
- Close the pump return pipe.
-- Blow compressed air under pressure of 800 mbar
( 11.6 psi ) into Suction tube.
Immerse pump in a container filled with clean
petrol.
There should be no sign of dny leak.
Work on petrol gauge sender unit :
To work on the petrol gouge sender unit it is
necessary to drain the tank (drain plug 1, and
~emcwe it. It is held by double strap fixed by
nut (2 1.
Tightening of nut (2) = 15 mN ( 1.; m.kg )
( 10 3/4 ft.lb ).

Downloaded from www.Manualslib.com manuals search engine IGNITION
OPERATION N’ MA. 210-00 : (:horr/r/c,ri.s/ics nrtrl spccinl /C,O/UTCJS of /he igtti/ioe Op. MA. 210-00 1 M 20/616
M 22/617 M 23/623 ENGINES
I CHARACTERISTICS
ENGINES
........ ........... ................................................. M 20/616 - M 22/617 M 23/623
DISTRIBUTORS ........................................... MAGNETI-MARELLI _._ ..............
DUCELLIER DUCELLIER
Reference N” ........................... .., ............................. _._ S 167 A 4510 B 525 068 A
Rotation direction ( seen from drive side ) ....................... 4 Anti-clockwise -
Contact pads pressure ( for information purposes ) ..............
w 440 A
50 g -
Distance between contact pads
* ................................... 0 40 mm C
Closing angle of cam ................... .................................. 55" It
2 3G
DWELL ratio ............................................... 4
....... .......... 61 -7 23 i’-
Angular gap between the four opening points ( symmetry
of the cams ) ....................................................... - 1” max 4
Capacity of condenser ......... ... ............... ...... ........ 4 0.33 i 0 03 /IF-
Minimum resistance of condenser ...............................
., ...
4 5MQ -
Centrifugal advance, ref. n’- of curve ................................. -LA2 - LA 4
Vacuum advance correction, curve advance ..................
LD 2 Static advance
: lo’- engine flywheel Strobe setting
: 10’ % 1’. at idling speed 850 to 900 rpm for manual gearbox
700 to 750 rpm for converter gearbox

Downloaded from www.Manualslib.com manuals search engine 2 OPERATION No MA. 210-00 :~~‘hornc:cris:ics mri special /~~nttrrc,.s o,/ /he ig/litiorl Spark plug gap .,...._.......,...,. ,..._. ,...... ., ,, ,,
Q.6 to 0.7 mm
1 iqhtenrng torque ( cylinder head cold ) .._..._._........._.......... .20 to 25 mN ( 2 to 2.5 m.kg)
f Smear the thread with e NO-BIND n ) - ( 14 l/2 to 18 ft.Ib ) IGNITION COIL
External resistor type
I Manufacturer
I DUCELLIER
I SEV MARCHAL
I MARELLI
Reference N” 2777 C E 44 910 312 BZR 206 A
Primary circuit resistance ( at 20” C ) 0.68 i 0.02 n 1.1 to 1.2 Q 0.8+ 10 .: ,R
Resistance of outer resistor (at 20” C ) 1.32 + 5 ‘; R 1.5 to 1.6 R 1.35 i 4 . . R
Secondary circuit resistance (at 20” C ) 7500 2 1000 n
6000 -!I 5 Cl 7500 + 10 !’ Q H.T. LEADS
Length in mm Resistance of leads ( at 20” C )
Manufacturer. .................. .......................................................... ..................................................... ELECTRIFIL
Reference ..................... ............. ........... ....... ....... ... ........................ ............ ......... Bougicord 400 RTF 33
All rY?biclas ( - I/’ 1975 1
Description of leads
Coil to distributor ............................ ...........
Distributor to No 1 cylinder ... . ..................
Distributor to No 2 cylinder .......................
Distributor to N” 3 cylinder ........................
Distributor to N” 4 cylinder ........................ 570 to 580 625 to 1025 !J
400 to 410 420 to 645 11
520 to 530 555 to 850 11
540 to 550 580 to 880 Q
710 to 720 770 to 1165 Q
I I I
Description of leads Length in mm
I Resistance of leads ( at 20” C )
Coil to distributor ......................................... 820 to83O- 10 1 75 -859 to 860
Distributor to No 1 cylinder ..................... 360 to 370
Distributor to N” 2 cylinder ........................ 520 to 530
Distributor to NC 3 cylinder ....................... 540 to 550
Distributor to N” 4 cylinder
...................... 710 to 720 920 to 1400 - 10 175 -93.3 to 1450
400 to 570 n
555 to 850 R
580 to 880 Q
770 to 1165 Q
I I 1

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 210-W 0 : Ch araclcrislics ~3rd spcial /W~~NWS 0j thr d~~fmt~i~ Op. MA. 210-00 a 1
ipith syslwn.
I
M 23/622 ENGINE
TRANSISTORISED IGNITION WITH ELECTROMAGNETICALLY CREATED IMPULSES
$ OPERATING PRINCIPLE
?
:
I
,D The electronic ignition comprises a coil ( 1 1. (I transistorised module ( 2) which includes among other components.
-
.f a power transistor working as a contact breaker.
and a distributor (3 1 with a magnetic pick-up ( impulse generator )
and an H.T. rotor.
;
ii
:
F The primary current from the coil goes through a switching transistor situated in the module ( the earthing is carried
“7
out via the fixing bracket for the coil mrd module assembly ).
As an impulse is created by the sensor in the distributor. it switches off the transistor and thus cuts off the flow
of current in the coil primhry circuit. which causes a (< High Tension 1) current in the coil secondary circuit.
The module is located in the distributor..replocinq the contact breaker unit in a conventional ignition system. It
comprises a sensor (4) and a 4-point star ( 5 ).
The,sensor has a permanent moqnet inside a winding. This windinq is connected electrically to the module
I
/
The 4-point star is made of metal. and has one star per cylinder. It is fitted in place of the rotor mm cam in (I
conventional ignition system.

Downloaded from www.Manualslib.com manuals search engine CHARACTERISTICS
ENGINE REF.
........................................................................................... ........................ M 23/ 622
DISTRIBUTOR DUCELLIER ..................................................................................................................
Reference ..................................................................................................................... 525 100 A
Direction of rotation ( seen from drive end ) . .................................................................
Anti-clockwise
Star point gap ( between star point and sensor ) .............................................................. 0.3 to 0.5 mm
Angular positioning of star points ( symmetry of signal ) to within ........... ... ... ....... ..... 1” max.
Resistance of module 960 to 1140 fi .................................................................................................. Centrifugal
advance curve identification mark ................................. . ..................... LA 5
Vacuum advance correction
curve identification mark : ..................................................
LA 3 Static advance
: 10” engine flywheel . .’ Strobe setting
: 25’ at 2500 rpm SPARK PLUGS
Spark plug gap ................. ....
.................... ................... ....... 0.6 to 0.7 mm
......................... .........
Tightening torque ( cylinder head cold ) ....................................................................
2 to 2.5 daNm
( spl,(,c,)’ //T(, /hrc,nc/ /ig/T//>f cc,i//T H ,VO J~/,N/) )) ) ...................................................... (14.5 to 18 ft.lb )
I IGNITION COIL ‘AND TRANSISTORISED MODULE ASSEMBLY
I
Manufacturer ...............
................... ........ .............. .............. .......
AC - DELCO
...........................
Reference N” 210
....................................................... ...
....................................................
Resistance of coil primary circuit ( at 205 C ) ............................................................ 0.48 - 0.61 R
Resistance of coil secondary circuit ( at 20” C ) ......................................................... 8500 to 10500 fl H.T. LEADS
Description of leads Length in mm
Coil to distributor ....................... 1040 to 1050 mm
Cylinder N” 1 ............................ 440 to 450 mm
Cylinder N” 2 ............................. 520 to 530 mm
Cylinder N” 3 ................................ 780 to 790 mm
Cylinder No 4 850 to 860 mm
............................ Re:;istance of leads ( at 20L C )
I
1120 to 1765 (1
480 to 780 Q
530 to s95 Q
825 to 1335 Q
900 to 1445 R

Downloaded from www.Manualslib.com manuals search engine OPERATION NO MA. 210-o : chcJckir,R fl,,d fld;linshp the, iRrlihil Op. MA. 210-O 1
M 20/616 M 22/617
M 23/623
ENGINES
1. Checking the dwell angle :
a) L’siep n SC,, 0, /C‘d‘,V gmg’s
Adjust the clearonce at the contact points to 0.40
mm I ‘Thic in,pwcic~~ wc,/hod iy PK,!
,I
ndr isvohle 1. ;i”
b) I’si,,fi a co,,, o,,~I<~ rh<,rkis~ drr’ir<, or RI,
,r 5.~~ :s
osri//risrop<~ :
The closing angle must be 55’ ? 2’30’
c) L’si,,g 0 d,,~r~ll,,,ct<~r :
The DWELL
ratio must be 61 i 3 .’ .‘.
.
2.
Checking the distributor timing :
i Disconnect the vacuum advance correction on 2350
cc engines M 23/623 )
a) hi,,c o \/robe lo,,,/~
Connect the H.T. lead from the strobe lamp
to the H T lead for No 1 cylinder at the dis-
tributor cop. Shine the strobe onto the fly-
wheel ( 1 ).through opening (( a P)
Run the engine at idling speed 850 +o 900
rpm ( Torque converter : 700 to 7x) rpm ).
Read off the advance on flywheel [ 1 ) in line
with fixed mark (< b 8). It must be 10 i 1
before T.D.C , , <,//or, v,or& S< < /> ,,
If not, slacken nut ( 2 ) and rotate distributor
to ohtoin this condition. Tighten nut (2) from
1.9 to 2.1 daNm ( 13.5 to 15 ft.lb ).
Stop the engine.
b) U.sivR n riin~uo.~~ir m,d od;uc!ir,,~ ~r~c~-lwu~h :
TECALEMIT
Model Tecamatic 30, SOURIAU,
models 1615.01, 1625-01 or 1256.61.
RABOTTI. model Robofast 103.
( These models are mentioned in the Equipment
and Repair Materials manual, OI in the green
Tools and Equipment Bulletins 1.
This method is recommended for its speed, its
precision and the ease with which it is carried
ou+.
Connect the 12-pin plug of the test-bench to the
corresponding socket on the diagnostic wiring
harness of the vehicle. makiug sure the
irrhibifor is litlrd rorwc~ly.
Run the engine at idling speed.
Read out the advance ( rma>rksha// drFwvs , on
the test-bench. It must be lo” + 1:. If not.
slacken nut (2) ond rotate the distributor to
obtain this condition.
Tighten nut (2 1 from 1.9 to 2.1 daNm ( 13.5
to 15 ft.lb 1.
Stop the engine.
Connect the YOCUU~ advance correction on 2350 cc
engines ( M 23/623 ).

Downloaded from www.Manualslib.com manuals search engine 2 OPERATION No MA. 210-O : (.hrrkb,g nnci adiustiug ~hc igrzitim
If CI strobe lamp 01 a diagnosis test bench ore not available. adjusting the distributor timing may be carried out
using LT test lamp. with the engine at static advance point. ( See Chapter III, pages 4 and 5 ).
3. Check the spark regularity :
tisiag n s/robe Imp :
With the distributor timing properly odj.usted ( loi ? 1’ at 850 ?- 50 rpm or 700 ? 50 rpm for torque converter 1,
the advance point must remain within 2”.
1’s;~~ n dinpi,osfir /cs/-hozrh :
The start of opening, or the dwell angle value of the contact breaker ( according to the type of test-bench used )
should not vary by more than 2’ on each boss of the cam.
If this is not the case the rotor clrm 01 the contact breaker bock-plate ore faulty
The distributor must be reconditioned or replaced. II. CHECKING AND ADJUSTING THE DISTRIBUTOR ON A TEST-BENCH
L.21.4 ante LA 2
n Centrifugal adv

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 210-O : (.h(~~-ki/lg n~lc/ c~tlj~~s/irtg the igrlitiorl Op. MA. 210-O 3
1. Checking the condition of the contacts :
Check the voltage drop across the contacts ( contacts closed ) under a voltage of 12 volts. using a test-bench.
The voltage drop should be 0.2 volts max.
I
2. Checking the centrifugal advance curve :
a) Note the advance in stages for steadily increasing engine speeds from 0 to 3000 rpm. and for steadily
decreasing engine speeds from 3000 rpm to 0, t~/~kjj/$ SII~L’
the irirwasc, or d~,rrc~as~’ is c-o~~ti~ootl.5.
These points must fall within the shaded area of the curve.
b) To a certain extent. it is possible to correct the advance curve, by altering the tension of the springs for
the centrifugal weights To obtain this condition, slightly bend (
iv t/1(, np1)ro/)riotc, ciirectioll J the securing
brackets for the springs, or replace them.
IY NOTE : If luminous spots are produced outside the four normal positions at speeds under 3000 rpm. make
5 sure the contact points are clean and if necessary make sure the test-bench battery is fully charged. before
U replacing the contact-breaker unit. the spring of which may have weakened.
7
co
m
r 3. Checking the spark regularity :
2
Whatever the speed of rotation, the angular difference of the four opening positions of the points must n.ot
3 exceed lo I 21n.xint~lm r/In/ oj distributor : 3250 I./)NI. c,.vcc,pt I)l’(.lit,t.tt~K 525 06X A : 2750
r/m 1,
c
E
!i
a
z 4. Ch k’ ec rng and adjusting the dwell angle :
Run the distributor at a steady speed, and check that the dwell angle is equal ;o 55’ ? 2”30’. If this is not the
case, adjust the contact breaker to obtain this condition.
5. Checking the ignition condenser :
With the contact points open. measure the capacity of the condenser; This value must be 0.30 i 0.03 wF.
If this is not the case. replace the condenser.
6. Check the vacuum advance curve :
This check is carried out at a constant rpm of 200, with no centrifugal advance.
Check the points of the increasing curve. and the decreasing curve. If the vacuum capsule has n hathcr.
it will be necessary to blank it off during this check.

Downloaded from www.Manualslib.com manuals search engine 4 OPERATION No MA. 210-O : (hcrkir,p or, III. FITTING THE DISTRIBUTOR ONTO THE VEHICLE
1. Set the distributor to the static
advance point :
a 1 Bring piston of NC 1 cylinder to the static
advance point, as follows
Lift the L.H. front wheel of the vehicle ( L.H.
side of the vehicle jacked up ) and engage
4th gear.
Blank off the plug-hole with the palm of the hand.
Rotate the L.H. front wheel, and stop when the
palm of the hand is pushed back by the force of
the compression.
Slowly rotate the wheel to bring the 10”
morkabx
of the engine flywheel ( 1) opposite the fixed mark (c a aa.
b) Fit the distributor
Remove the distributor cap.
Insert the distributor into its housing ( see
position on the dioqram below 1.
-, water pump LONGITUDINAL AXIS OF ENGINE
--~-__ -- -- ----~--
Position of distributor arm before position-
ing distributor in its mounting
I
w
Vacuum capsule
removed
capsule in place Position of arm after fitting distributor

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 210.0 : c l~vritis,e nvrl Provisionally position support plate (2 1 and
gently tighten nut ( 1 )
c) Switch on ignition
Connect a test lamp to earth and to the G RUP B)
terminal of the ignition coil.
Turn the distributor until the exact moment
when the indicator lamp liqhts up.
At this point the distributor is al the static
advance point.
Switch off the ignition.
Tighten nut ( 1 ) from 19 to 21 mN ( 1.9 to
2.1 m kq 1 ( 13 l/2 to 15 ft.lb 1.
Fit distributor cap and secure it
Fit sparking plug in cylinder No 1 2. Checking the ignition timing using a stroboscopic
Imp or (I test-bench
( See chapter I,, page 1 i.