1984 Citroen CX Camshaft

Downloaded from www.Manualslib.com manuals search engine INJECTORS ( i ) :
Each cylinder is supplied by an electro-magnetically controlled injector which is fitted in the inlet duct;
the injector vaporises the fuel upstream of the inlet valve. In the case of the (( L-Jetronic )) system. all the
injectors operate simultaneously. However, in order to ensure regular fuel supply to the cylinders, there are
two injections for each rotation of the camshaft, each one supplying half the metered quantity of fuel required I
for the complete engine cycle.
The injector consists of a valve housing and an injector needle fitted with a magnetic core. The mobile magnetic
/
core is in one piece with the needle which in turn is compressed against the air-tight injector housing seat by
a helicoidal spring. At the rear end of the injector, there is a solenoid. and at the front a guide for the injector
needle.
Impulses coming from the E.C.U. create a magnetic.field in the solenoid; the magnetic core is attracted, and the
needle lifts off its seat the fuel under pressure is free to pass through, The movement of the magnetic core is
approximately 0.15 mm.
The duration of opening is determined by the E.C.U. as a function of the operating conditions of the engine at the
moment in question{. TEMPERATURE SENSORS t(
When the engine is started, for a temperature of approximately - 20” C, it needs two to three times more fuel than
when it has reached normal operating temperature. The enrichment of the mixture must be reduced as the engine
warms up, and must cease as soon as the engine has reached normal operating temperature. In’order to start off
this regulating procedure, the engine temperature must be communicated to the E.C.U. ( Electronic Control Unit ).
This is the object .of the temperature sensors.
The temperature sensor consists of a hollow threaded rod in which is located an NTC Thermistor made in semi-
conducting material. The letters .NTC, which signify (( negative temperature coefficient )) characterise its specific
property : its electrical resistance decreases as the temperature increases.
The (( L-Jetronic 1) system is fitted with.a water temperature sensor ( 2) and an air temperature sensor, the latter
situated in the air-flow sensor.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 173-O : Chrrkivp fhr prmd s,,pp/> Op. MA. 173.0 1
PETROL PUMP
AC DELCO pump reference E/PE 4.777
Auto-regulating diaphragm lift and force pump
operated by eccentric on camshaft.
This pump is fitted with (I device which enables it
to function on re-cycled petrol. This re-cycling is
effected by means of a by-pass .( 1 ) fitted on the
carburettor cover.
Excess petrol supplied by the pump returns to the
tank across an orifice calibrated from 0.8 to 0.9mm
in the by-pass union (1).
PETROL PUMP OUTPUT
(I) Otitput nil, maximum pressure : 325 mbars (4 7 psi).
b) Output through open carburettor float needle
valve.
500 45 88
3000 65 170
5500 69.5 192
I I
Minimum pressure
in mbors
INSTALLATION OF PETROL PUMP
Fitted on the crankcase with :
one (( Phenoploste P12 )) spacer 5 + 0.1 mm thick.
two (< SOCOID a> paper gaskets fitted dry.
Tightening torque for petrol pump nuts :
21 mN ( 2.1 m.kg ).( 15 l/4 ft.lb )
CHECKING THE STROKE OF THE PUMP PUSH-ROD
a) With the pump removed and using (I depth gouge A,
take the measurement between the upper face of
the spacer ( with paper joints ) and the camshaft
eccentric in its high position and in its low
position.
This measurement should be :
- Upper position of eccentric 27.4 ? 0.35 mm
- Lower position of eccentric 32.4 rk 0.35 mm
b) Measure the length u a a) between the spring stop cup
and the tip of the pump control push-rod.
This length should be :
a = 4.5 mm minimum

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 236.0 : C h<,rki,,p a,,d nd;r,slh,p I/w jwllr\s aurl /x,//s Op. MA. 2360 I
PULLEY ALIGN& IENT
1. Aligning the camshaft pulley :
a) Position device 3085-T on the water pump
pulley.
b) Bring its rod into contact with the groove of the
camshaft pulley.
NOTE Aligning the camshaft pulley is carried
out by’plocing shims behind the pulley.
Tightening torque for nut (2) for the comshoft
pulley : 8 daNm ( 58 h.lb ).
2. Aligning the alternator pulley :
Proceed as for camshaft pulley / ,,,;/I> s SC-r<,!, , j I /or I,,<, RllI~)11010F c<)L,, <,d i,, ,,
NOTE Aligning the alternator pulley is carried
out by plocinq shims behind the pulley.
Tightening torque for nut (4) for the olternatov
pulley : 4 daNm ( 29 ft.lb ).
3. Aligning the high pressure pump :
a ) Tighten pump on its support plate
b) Place device 3085-T on the camshaft pulley.
c) Brinq its rod into contact with the groove of the
pump pulley.
NOTE Aliqninq the H P pump is curried out using
adjustment shims placed between the pump housing
and the support plate.
Tightening torque for the nut securing the H.P. pump :
4 doNm ( 29 ft.lb ).
NOTE Vchirlc,s filled ,,~;//I oirrrii,rli/iriniii,~
For the alignment of the compressor pulley, SLO
Opr~mrio~, MA, ~,40.,-(,.

Downloaded from www.Manualslib.com manuals search engine HIGH PRESSURE SINGLE CYLINDER PUMP f-/i, to-0 j
1.7 to 1.9 daNm
12 1/‘2 to 14
ft.lb
1. Plug
2. O-ring
3. Seat
4. O-ring
!i. O-ring
6. Sleeve and piston
7. Snap ring
8. Spring plate
9. Spring
10. Body and intermediate piston
11. Plunger
12. Roller
12
ZESCRIPTiOH
Reciprocating single-cylinder pump, operated by an eccentric machined on camshaft
Operating ratio ,.
_..__.,.,..._.. . . . . . . . . . . . . :... ,. 1 cycle/ 2 engine revolutions
-
- Piston diameter .._....._.....,,.......,............. .,.,.,.,... .,. 14 mm
- Piston stroke ( (‘c-c c,///rrc~ /if/ ) ,. ,,... ‘10 t 0.10 mm
.._..... ..,....,.,............. ..I.
- HI ,,‘OJJ f~ji,~c/icntin~f : output (111fr1cr /on{1 of I75 1~nr.s.
/ictirl f/f (10” (. i.. 1.07 cm3per cycle
SPECIAL FEATURES
Tightening torques :
- Pump fixing screw on crankcase .._.....,.._._..,.....,.............. .._,__. _. _.. .._......_........ 19 mN ( 1.9 m.kg) ( 14ft.b)
( Fit a ,~c,~I’ paper sc~nl ~r,hcvc,r’c~~ pzrmp is dismar~tld~ -

Downloaded from www.Manualslib.com manuals search engine H.P. SINGLE-CYLINDER PUMP ( 10/‘1’)7(, -I
1.7 to 1.9daNm
12 l/2 to 14
ft.lb
1. Plua
2.0-= -ring
3. Seat
4. O-ring
5. O-ring
6. Sleeve and piston
7. Snop ring
8. Spring cup
9. Spring
10. Body and intermediate pist
11. Plunger
12. Roller breather
13. Pump unions
HP output
1
2
------3
One-way
e-
iI 7
.uH-.!.a
e
10
tn 11
ion
CHARACTERISTICS
It differs from the single-cylinder pump fitted up to lO/ 1976 only in the two pump breather unions.
Reciprocating single-cylinder pump, driven by an eccentric machined on the camshaft
- Operating ratio .._._._....._........ 1 cycle/ 2 engine revolutions
- Piston.diameter .._...................
14 mm
- Piston stroke I
ecrcwtric lijt J _......__._........_.._...,_........,._.._._...___,, 10 2 0.10 mm
- For iu fomalior~ : output ( unJer prc’ssure oil75 bars (2F3X psi),
and with fluid at 60’ C _.__.._______.._.___._.___,........_._....__.__.._............ 1.07
cm3 per cycle
SPECIAL FEATURES
Adiustments :
- Clearance between pump and body ( b+rc, tightwivg ) 0.05 to O-09 mm
- Clearartce obtained by usivg shims ojrli/!vrcrtt thirhc~sses 0.05 - 0.10 - 0.15 - 0.20 mm -,..
Tightening torques :
- Pump fixing screws on crankcase . . . . . . . . . ..__._.._.._...._...__.........._.,. 1.9 dab ( 14 ft.& )
( Fit a neu’ paper seal u’bencucr p~unp is dismant/cd)

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.