1977 Citroen CX clutch

Downloaded from www.Manualslib.com manuals search engine Op. MA. 510-00 b 19 ELECTRONIC FUEL INJECTION ( i/ 1077 -)
TABLE OF FUSES ( LHD )
SUPPlY Fuses
Circuits protected
Ratinq Colour
Lightinq for qlove-box, bonnet and boot
Centre and rear interior lamps
Accessory terminal
Front L.H. mirror
16 Amps Green (F-2)
Flasher unit. and handbrake warninq lam1
Anti-theft
E Water temperature gauge
switch Cigar lighter
Reversinq lamps
Heated rear window, and warning lamp
+ )) Battery terminal
Instrument panel fuel gauge and low fuel
warninq lamp
Anti-theft
switch Liqhtinq for speed0 and tacho ( Rheostat )
16 Amps
(RFe3d)
_ Battery meter (thermal voltmeter ).
tachometer, warning lamp for brake pad
wear, coolant and engine oil temp. 1
enqine oil and hydr. fluid pressure.
direction indicators ( flashing )
Direction indicators
Voltage requlator
Windscreen wiper and washers
Horn
Windinq for relays for heater unit front
window-winders and horn compressor
Hazard warning lamps
Stoplamps
Clock
Winding for r-elays, for front and rear foglamps
Front and rear, L.H. and R.H. sidelamps, + warninq lamp
Number plate lamps
Lighting switch 10 Amps Yellow Liqhtinq for instrument panel (battery meter. clock. odo-
meters )
(Fl) Lighting for iqnition switch, cigar-lighter, ashtray, water
temp. gauge and heater controls.
Map-reading lamp and fuse ( 5 Amps )
10 A.mps Blue
(F4) Rear foglamps and warninq lamp
Relay for window-
winder 16 Amps White
Front L.H. and R.H. window-winder motors (FE)
Relay for air-
conditioning 16 Amps Mauve
(F5) Air blower
Air-conditioning, compressor clutch, windinq for L.H.
electric fan relay, idlinq speed control electro-valve
( according to model )
Alternator 81) Amps
Incorporated fuse ( on printed circuit ) Components not protected
: Starter, and horn compressor
- OII anti-theit .switrh : ignition circuit, E.C.U. and injector relay, petrol pump, electric fan relays and electric
fans
- cm lighting switch : main and dipped beam headlamps and warning lamps, front foglamps, winding for rear foglamp
cut-out relay.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 510-00 b : A,.,.N//~w~/w/ of I/J<, c~l~~clriccrl iti7tollnliou (0 1075 -i Op. MA. 510-00 b 21 DESCRIPTION OF COMPONENTS
dent.
lark Description and Location Ident.
mark Description and Location
1
Front R.H. sidelamp ............................ 112 42
Engine oil temperature switch 71 ...............
Front R.H. direction indicator .... ... .........
66 43 Water temperature sensor .... .............. 92
2 Front R.H. foglamp 107 44 Reversing lamp switch ................... 95
..................... ....... ....
3 R.H. headlamp main beam
;:: :: Horn compressor relay ..................... 53-54
............... ....
dipped beam Window- winder relay .................. 44-45
......................
47
Heating and air-cond. relay ...............
4 R.H. electric fan ............................... 35 42-43
48
.............. 34-35
5 LH electric fan ( air--conditioning ) Relay for R.H. electric fan
........ 37 49
Relay for L.H. electric fan (air-cond. ) ..... 36-37
6 Thermal switch for electric fan .............. 34 50
R.H. brake unit
........... 80-81
......... ............
7 Horn
....................................
.......... ..... 55 51
Widscreen washer pump .............. .... 56
8 L.H. headlamp main beam ........... ..........
gg 52 Electra-valve for fast idle (air-cond. ) ......... 41
dipped beam ......................
100 53
Windscreen wiper motor ............. 57 to 60
9 Front L.H. foglamp ... . ...............................
106 54
Air blower ..............
........... ..... ........... 42 10
Front L.H. sidelamp ......................... ... ... .. 111 55 Regulating thermal switch (Air-cond. ) .... 40
Front L.H. direction indicator
63 56 ................... Hydraulic press. switch .......................
75 11
Air-flow sensor 13 to 18 57
........................... ... Injector resistor housing .................... .20 to 23 12
Coil. and ignition module
28 to 30 58 Fuse box ............................ 42-45-58-90-105-l 11
................. 13
Butterfly spindle switch 10 to 12 S9 Hydraulic fluid level switch ...................... 76
.................... 14
Starter 3 t0 5 6o L.H. brake unit ........................ 78-79
..........................................
88 15
Cold start injector 11 61 Front R.H. door lighting switch ....... ....
.................................. 16
Alternator 5 62 Glove-box lighting ................................ 90
...........
....... ..................... ....... 17
Compressor clutch ( air-conditioning ) 40 63 Map-reading lamp and fuse ............... ..... ... 110
.........
64 18
Pressure switch 40 Cigar-lighter and lighting ...................... 94-l 12
........................................
65 Ashtray lighting 113 ..................................... 19
Double relay for injection control 7 to 27 ............ 66
Radio(equip. locat. t aerial ) .......... 83 to 85
20 L.H. electric fan relay (air-conditioning) 38 = 39 67
Handbrake flasher unit housing .............. 97-98 21
Rear foglamp cut-out relay (main beam) 104 to 105 68
Electronic control unit (injection ) ....... 8 to 25
22 Front foglamp relay ....................... .. 106 - 107 69
Lighting for pneumatic oil- gauge .............. 72
23
Supply relay for rear foglamps ............ 106 to 108 70
Anti-theft switch ............................ 4-28-58-93 24
u Diagnostic )) socket 52 ......... ....... ... ..... ........ 33 71 Stoplamp switch ...................................... 25
Connector for HT sensor 72 ................... 87
....................... 32 Front L.H. door lighting switch 26
Water temp. sensor ( Injection ) Rear view mirror ............................ 92 to 95
... 25 73
27
Ignition sensor on No. 4 cylinder 32 74 Rear view mirror switch ................... 92 to 95
............. 28
Injector for No. 4 cylinder ...................... 23 75 Front L.H. window winder motor .......... 45-46 29
Injector for No. 3 cylinder 22 76 Front R.H. window-winder motor .............. 49-50
...........................
......................... 85 30
Injector for No. 2 cylinder 21 77 Speaker ( in front R.H. door )
......................... 78 Centre interior lamp ............................... 87 to 89 31 Injector for No. 1 cylinder 20 ............................. 79 R H. window-winder switch .................... 49 to 51 32 Thermal switch
........... .......................... 10-11 8 o
Interior lamp switch .................... ................ 88
33 Supplementary air control ............................
8 81
Air-blower switch and lighting .......... 42-112-113 34 T.&c.
SenSOr ........................................... 31 82 Air-conditioning switch ............... ............ 40
35
Magnetically triggered distributor ........ 29 to 32 83
L.H. window-winder switch .....................
45-47 36
Compressor for air horns ............. ..... ......... 53 85 Handbrake contact ......................................... 98 37
Voltage regulator 5-6 86 Water temp. gauge + lighting ..................
92-110
....................................... 38
Battery 1 87 Windscreen wiper timer
.......................... 59 to 61
....................................................... 39
40
41
Under-bonnet lamp ........................................ 81 88 R.H. switch unit for lighting
Engine oil pressure switch 73 - Speedo. t tacho. lighting rheostat ............ 79
............................
99-103
Coolant temperature switch 77
- General lighting ................................
....... ....................
- Rear foglamps ..................................... 105

Downloaded from www.Manualslib.com manuals search engine II. OPERATING PRINCIPLE
The refrigerating system has four main components
- the compressor ( 4)
- the condenser ( 7)
- the pressure release valve (3 i
*
the evaporator ( 1 )
The refrigerating fluid used is the F. 12
L.64.1 a
Compressor
(4) - Manufacturer ASPERA FRIGO. type HG 700 ( or SANKYO type SD 508 on EMBAUT CLIMAT )
ASPERA twin-cylinder or
SANKYO five-cylinder rotary 1 Fitted onto the gearbox by means of a mounting bracket
The compressor circulates the refrigerating fluid draws in the fluid which is in a low-pressure vapour state
compresses it ( which increases its temperature ) and expels it into the condenser.
The condenser is driven by the engine via the water pump by two trapezoidal belts ( ASPERA ) or one trapezoidal
belt ( SANKYO ).
An electro-magnetic clutch is fitted to the compressor pulley. Its operation controlled by a switch on the centre
console is intermittent due to the presence of an ambient temperature thermostat ( 2 ) which is not adjustable, and
which senses the temperature near the evaporator cooling fins.
In case of excessive pressure in the return circuit, a pressure switch (6) opens the supply circuit to the compressor
clutch.
Condenser (7 ) - Manufacturer CHAUSSON
It allows the fluid to condense and to release its latent heat to the outside air circulating around the fins. It is
secured to the front L.H. side of the engine cooling radiator At the condenser outlet, the fluid is in the high-
pressure liquid state. The fluid flows through the tank ( 5) ( which contains a dehydrating filter ) and flows
towards the pressure release valve.
A 5-blade electric fan accelerates the circulation of air around the condenser fins.
De-watering tank .( 5) - Manufacturer : SINGER
It contains a dehydrating filter element, and is fitted with a visible level indicator, which allows the amdunt .and
state of the fluid to be checked, and a high-pressure switch (6).
The de-watering tank is fitted on the front panel by means of a mounting bracket at the rear L.H. side of the
engine cooling radiator.
Pressure-release valve (3) : It is incorporated in the heater unit, and regulates the output of fluid towards the
evaporator.
Evaporator ( 1) - Manufacturer SOFICA
The air flowing through the evaporator releases its calories, ‘which will cause the low pressure fluid to be
transformed into vapour.
It is incorporated in the heater unit upstream from the heater radiator.

Downloaded from www.Manualslib.com manuals search engine IV. DISTRIBUTION FLAP ( Vl) CONTROL
Flap V 1 is controlled by C 1. It is controlled pneumatically by vacuurr
The vacuum intake is at the carburettor
The flap is controlled by a pneumatic piston subjected to vacrrum via a switch When control C 1 is positioned
between the small blue square and the red square the piston,in the switch is lifted ( fiq ( A ) ) vacuum intake
is cut off’ the supply pipe to the pneumatic piston is at atmospheric pressure flap V 1 blanks off intake E 2, and
air drawn into the intake on the bonnet comes from outside With the engine runninc and control C 1 positioned
between both blue squares ( fiq. ( B ) ) the piston in the switch comes down under the action of its spring.
supply
pipe to the pneumatic piston is no lonqer under atmospheric pressure but under the action of the vacuum, and
flap V 1 via the pneumatic piston blanks off intake E 1’ the air drawn in comes from the passenqer compartment,
( recycling position ).
NOTE Identification mark for fittinq the one way valve the outer diameter is reduced on the side of the 3-way union V. FAST IDLING SPEED CONTROL
This control allows for a faster idling speed when the compressor is operatinq
A vacuum capsule incorporated in the carburettor slightly opens the first choke butterfly by means of a small rod.
The amount of opening is adjustable by means of a screw on top of the vacuum capsule.
An electromvalve fitted to the R.H side of the front subframe and supplied at the same time as the electro-maqnetic
clutch for the compressor controls the supply of vacuum to the capsule. t FRONT
Vacuum intake
Carburettor /
Vacuum capsule
Pneumatic p Towards flap V 1
Action of vacuum
I (Cl in recyclinq
position 1
vale
Vacuum switch
7 1
- Vacuum
-- - - Atmospheric pressure

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 640-00 : (:hnrnc-/eris/ics nrtd s.pcc-in/ ~bntttrcs of I/T<< nir- Op. ihA. 640-00 5
c-ottdiliottittg systc~ttt
VI. ClRdUlT DIAGRAM FOR dONiROL OF ELECTRIC COOLING FANS AND AIR-CONDITIONING SYSTEM
(-'/lo76 )
I
I L 64-4
I 1. I
+I
-
Air-conditioning
harness
r
-I% ii.+
f:N
r
Mv
A
-1 Front
b 3
1
Engine
harness
VC -
I- __------
I KEY
I I
I
I- Standard wiring 1
17
/TTj I I
I -Air-conditioning 1
L2Ginq--~_J
Earth (front L.H. wheeiarch )
Earth on gearbox) 1
- Control relay for supplementary electric cooling fan
2 - Control relay for air blower
3 - Ambient thermostat ( located on evaporator )
4 - Air-conditioning switch ( on centre console )
5 - High pressure switch ( on de-watering tank )
6 - Electra-magnetic clutch for compressor
7 .
Electra-valve controlling fast idling speed, arid pneumatic recycling piston ( WEBER electro-valve )
8 - Control relay for supplementary electric fan for air-conditioning
9 - Control relay for electric cooling fan
lo.- Ignition coil 11
- Idling cut-out ( on carburettor ) 12
- Electric cooling fan 13
- Thermal switch for electric fan cut-in ( on radiator ) 14
- Supplementary electric cooling fan 15
- Air blower for air-conditioning 16
- Control resistors for air blower speeds 17
- Control for air blower ( three-speed )

Downloaded from www.Manualslib.com manuals search engine Operating principle :
Both electric fans ( 12) and ( 14) cool the engine coolant in the radiator. Electric fan ( 14) cools the condenser
when the compressor expels the air-conditioning cooling fluid under pressure.
Simultaneous supply to fans (12) and (14) :
This is carried out by means of contacts in relays ( 1 ) and ( 9). The fl ow of current in the energizinq winding of
relays ( 1 ) and ( 9) therefore operates both electric fans simultaneously.
The relay windings are supplied when
- ignition is switched on
*
thermal switch ( 13) controlled by the coolant temperature in the radiator is off. _-
Supply to supplementary electric fan ( 14) alone :
This is carried out by contacts in relay ( 8) when its energizing winding is supplied
The relay winding is supplied when
- ignition is on
- air-conditioning switch ( 4) is off
a
contact on the ambient temperature thermostat ( 3) is closed.
Supply to the electro-magnetic clutch for the compressor :
The clutch supply is a function of the following
- Air-conditioning switch (4)
- Ambient temperature thermostat ( 3 )
-
High pressure switch ( 5).
Supply to the blower ( 15) :
This is carried out by resistors ( 16) of the rheostat. This rheostat controls the speed of the blower ( 3-speed )
and consequently, the volume of displaced air.

Downloaded from www.Manualslib.com manuals search engine Op. MA. 640-O 1 II CHECKING AND ADJUSTING :
1. Checking the operation of the air-conditioning :
Faulty operation may be due to the following
Insufficient quantity of R.12 fluid, caused by
improper filling 01 a leak.
Water in the system.
Insufficient quantity of fluid may be detected by examining the transparent index mark of the de-watering tank.
This lack of fluid would be shown up by the appearance of air-bubbles during operation.
The presence of water is shown up by the formation of a small quantity of ice near the pressure release valve
which causes irregular functioning of the system.
In both cases. the system must be drained. the circuits niust be put under vwzuum (to eliminate any trace of
water ). and refilled with R.12 fluid. 2. Corburation
: Adjusting the idling speeds (as soon as electric coolinq fans cut out )
a) Vc,hirlcs wi/hou/ loryue con wrtcr :
Engine idling speed 850 to 900 rpm ( compressor switched off )
Fast idling speed 1000 to 1050 rpm ( compressor in operation )
b) Vrhirles with torque co~twrt~~r
Engine idling speed 700 to 750 rpm ( compressor switched off )
Fast idling speed 725 to 775 rpm ( handbrake on, vehicle immobilised. one gear engaged, and compressor
switched off 1
The fast idling speed is adjustable by means of adjusting screw located on top of the vacuum capsule on the
cmburettor. NOTE
: In case the fast idle is impossible to obtain, the vacuum capsule may be moved ( slacken both fixing
screws on carburettor ). in order to reduce the clearance at the fixing point of the rod controlling the first
choke butterfly opening. 3. Adjusting the pulleys :
Camshaft pulley-water pump pulley no aligning to be carried out
Toothed belt tensioner-water pump pulley L = 2’ - 0.5 mm. this value to be obtained by placing shims
between the tensioner and its mounting plate. c
Water pump /
In
Alternator drive
Tensioner
Compressor-water pump alignment to within 0.5 mm by placing shims ( 1 ) between the compressor mounting
plo& and the clutch housing.
Tensioner -compressor alignment to within 0.5 mm by
movement of the tensioner mounting plate in its slots. 4. Tensioning the belts :
Trapezoidal belts for compressor :
- Fitting tension 40 to 50 daN ( 40 to 45 kg ) ( 88 to 99 lb )
- Operating tension 25 daN ( 25 kq ) ( 55 lb )
- Toothed belt driving water-pump : 15 to 18 doN ( 15 to 18 kg ) ( 33 to 40 Ib ) NOTE
: Insufficient tension will considerably reduce the reliability of the toothed belt.
A tension stronger than 18 daN ( 18 kg ) ( 40 lb ) will cause the belt to whistle.
Consequently, adjust the belt at the limit of the noise : tension it until it whistles while running. then reduce
tension until the noise disappears.

Downloaded from www.Manualslib.com manuals search engine II. PRECAUTIONS TO BE TAKEN WHEN WORKING ON THE AIR-CONDITIONING SYSTEM
a) It is imperative to wear goggles
b ) Do not smoke R 12 fluid,in the presence of a flame turns into a toxic gas.
c) Never heat any section of the refrigerating system.
d) Never switch on the refrigerating system if both electric cooling fans are not connected
e ) Never check the compressor oil level without first having drained the refrigerating circuit.
f ) Never use any oil other than TOTAL (( LUNARIA 25 H, SUNISO No 5 or TEXACO CAPELLA (( E 1) grade 500
g ) Never use refrigerating fluid other than R.12.
NOTE Refrigerating fluid may- be sold under different names : FORANE (( 12 )), FLUGENE (( 12 ))! FREON ((12 ))
( the most important feature is the number (( 12 H which defines the fluid’s properties ).
IMPORTANT NOTES
A. The compressor
MUST NEVER b e switched on when the circuit has been drained of its refrigerating fluid.
during work ‘being carried out in the workshop. for example,. Indeed, in these conditions,
the compressor
would be functioning in air, and would deteriorate rapidly.
‘Consequently, in case of an exchange of compressor necessitating draining the system of its refrigerating
fluid, in a workshop not equipped with the necessary equipment for refilling ( SOGEV equipment )
IT IS
IMPERATIVE,
before driving the vehicle to another workshop equipped with the special equipment. to carry
out the following
- To leave the blanking plugs on the compressor. in order to avoid ingress of air ( the new compressor contains
refrigerating fluid ).
- To blank the intake and outlet hoses and to fix them tempororily.
- Todisconnect the supply lead to the electro-magnetic compressor clutch
( lead with white sleeve ).
NOTE : We remind you that if the circuit has been in contact with the atmosphere, it is necessary to replace
the de-watering tank, and the compressor oil.
B. Slight oil seepage is permissible at the front bearing of the air-conditioning compressor.
Compressors showing such a seepage, and being replaced OS a result, will not be accepted under warranty.
Ill. TIGHTENING TORQUES FOR THE UNIONS IN THE CIRCUIT :
( Oil the union threads with TOTAL LUNARIA 25 before fitting )
On the compressor Intake union : 5/8” 3.45 to 4.3,daNm ( 25 to 31 ft.lb )
Outlet union l/2”’ 2.9 to 3.75 daNm ( 21 to 27 ft.lb )
On the condenser Input union l/2” 4.85 to 5.5 daNm ( 35 to 39 3/4 ft.lb )
Output union : 3/ 8” 2.7 to 3.3 daNm ( 19 l/2 to 23 3/4 ft.lb )
On-de-watering tank : Unions : 3/8” 2.1 to 2.5daNm ( 15 l/4 to 18 ft.lb )
On : Input union evaporator : 3/8” 2.1 to 2.5 daNm ( 15 l/4 to 18 ft.lb )
Output union 5/8” 3.45 to 4.3 daNm ( 25 to 31 ft.lb )