1988 CITROEN CX Service Manual

GENERAL FEATURES OF THE CARBURATION
SOLEX and WEBER carhurettors are fitted with tamper-proof devrces for the mixture adjustment screws.
The SOLEX carburettor IS fitted with protective caps for the throttle spindle stop-screw of 2nd choke and butterfly
adjustment screw.
If the carburettor IS not properly adjusted, the orrginal protective plug (white on WEBER carburettors, black on
SOLEX carburettorsl will be removed, and after adjustment of the carburettor, will be replaced by a ((REPAIR))
protective plug (black on WEBER carburettors, and white on SOLEX carburettorsi
The Replacement Parts Departrnent supplres under Reference number 4029-T a kit for removing and refitting the
protective plugs on SOLEX and WEBER carburettors.
TOOLS INCLUDED IN KIT 4029-T, Fig. I et II:
A. Gun.
B. Tool for loading the gun.
C. Tool for extracting the plug (a) protecting the sunken mixture adjustment screw (SOLEX).
D. Tool for extracting the plug (a) protecting the sunken mixture adjustment screw (WEBERI
E. Tool for fitting plug (a) and cap (b) (SOLEX and WEBER).
F. Tool for breaking the head of cap (b) of the sunken mixture screw with collar (SOLEX).
G. Tool for extracting cap (b) (SOLEX).
H. Tool for fitting cap (c) protecting the stop-screw for the throttle spindle (SOLEX).
This kit also contains a set of plugs for SOLEX carburettors:
a) Protective plug for mixture adjustment screw.
b) Protective cap for mixture adjustment screw with collar.
c) Protective cap for throttle spindle stop-screw.
The Replacement Parts Department supplies caps in packets of. 10, under the following reference numbers:
- Protective plug for sunken mixture adjustment screw
SOLEX carburettor No. 75 489 718 (white)
WEBER carburettor No.
5 489 716 (black)
- Protective cap for mixture adjustment screw with collar
SOLEX carburettor
No. 5 501 075 U (white)
- Protective cap for throttle spindle stop-screw and butterfly opening adjusting screw
SOLEX carburettor
No. 5 507 643 (white)
UTILISATION
I. REMOVING AND FITTING A PROTECTIVE PLUG FOR SUNKEN MIXTURE ADJUSTMENT SCREW ON A
SOLEX CARBURETTOR.
REMOVAL. Fig. Ill, IV et V:
1. i-oad gun A on tool B.
2. Pierce plug (a):
- position tool C and hold it against gun A.
- position the gun and tool assembly against plug (a) making sure that the nozzle of gun A is properly centred
against the plug, and that the assembly is aligned as precisely as possible in the axis of the plug.
- actuate the gun, and remove it, leaving tool C on the carburettor.
3. Remove plug (a):
- load gun A.
- screw tool C into the back of gun A
- actuate the gun to remove the plug.
4. Adjust the level of pollution

C
D
E
F
G
H
A
77.212
I
a
b
C
‘6.1186
II
II
El
a C
a
C
16.1189 76.1191
IV

a E
16.1193 G 14.27
I
C H
16.1188 76.1192
III
I’
D a D a
A
'6.1351 76.1352
V

GENERAL FEATURES OF THE CARBURATION
FITTING. Fig. I and II:
5. Fit the tamper-proof protective plug (a):
- load gun A.
- screw tool E onto gun A.
- position plug (a) in its housing on the carburettors
- actuate the gun until the plug is properly located. II. REMOVING AND FITTING THE PROTECTIVE CAP FOR THROTTLE SPINDLE STOP-SCREW OF 2nd CHOKE
(cap c), ON A SOLEX CARBURETTOR.
This operation is to be carried out only in the case of a check and adjustment on a carburettor test bench
(L’POLLU 2000 type).
REMOVING AND FITTING THE PROTECTIVE CAP FOR OPENING ADJUSTING SCREW OF BUTTERFLY
UNDER OPERATION OF COLD START DEVICE.
REMOVAL. Fig. Ill:
1.
Remove cap (c) using flat-nose pliers
2. Adjust the butterfly opening:
Adjust the butterfly opening using the test bench according to the specifications (sent upon request by the
bench Maker to the users of carburettor test benches).
FITTING. Fig. IV:
3. Fit cap (c):
- load gun A,
- screw tool H onto the gun,
- fit cap (c) onto the throttle spindle stop-screw,
- place the tool and gun assembly against the cap (c) and actuate the gun. Ill. REMOVING AND FITTING A PROTECTIVE PLUG FOR SUNKEN MIXTURE ADJUSTMENT SCREW ON A
WEBER CARBURETTOR.
REMOVAL. Fig. V:
1. Load gun A on tool B.
2. Pierce plug (a):
- position and hold tool D against gun A,
- position the gun and tool assembly against plug (a), making sure that the nozzle of the gun is properly
centred against the plug, and that the assembly is aligned as precisely as possible in the axis of the plug.
- actuate the gun, and screw the tool into the plug (L.H. thread).
- remove the gun, leaving tool D
on the carburettor.
3. Remove plug (a), Fig. VI:
- load gun A,
- screw tool D into the back of gun A
- actuate the gun to remove the plug.
4. Adjust the level of pollution

GENERAL FEATURES OF THE CARBURATION
FITTING. Fig. I:
5. FIN the tamper-proof protective plug (a):
- load gun A,
- screw tool E onto gun A,
- position plug (a) in its housing on the carburettor (make sure it is fitted the right way round Fig. 111,
- actuate the gun until the plug is properly located.
EXHAUST EMISSION CONTROL
In order to comply with current regulations, the checking and adjustment of the exhaust emission from vehicles
with a petrol engine must, without fail, be performed after the following operations:
I. ENGINE REPLACEMENT.
II. CARBURETTOR REPLACEMENT.
Ill. WORK ON THE CARBURETTOR.
Replacement of parts of the carburettor.
Carburettor adjustment.
Work on the carburettor controls.
IV. WORK ON THE INLET MANIFOLD.
Replacement or removal of:
- the inlet manifold,
- the air filter,
- crankcase gas recirculation system
V. WORK ON THE ENGINE.
Rocker adjustment.
Replacement or removal of:
- the cylinder head,
- the camshaft,
- the rockers,
- the valves,
- the liners and pistons.
VI. WORK ON THE IGNITION.
Replacement or reconditioning of the distributor (wholly or partially)
Adjustment or replacement of the sparking plugs.
Adjustment of the ignition timing.
VII. WORK ON EXHAUST SYSTEM.
Replacement or removal of:
- the exhaust manifold,
- the silencer or any part of the exhaust.
VIII. WORK ON THE EMISSION CONTROL SYSTEM.
When the vehicle is fitted with a specific equipment (e.g. on vehicles of SWEDEN, AUSTRALlA or JAPAN type)

i
a
'6.1193
I
G 14.27 1
II
8531

CARBURETTQR SPECIFICATION
c 8531

CARBURETTOR SPECIFICATION
Engine type 829.A5
t
MAKE : WEBER
Type : 34 DMTR 461250 Ref. W 88-50
34 DMTR 46/250 W 89-50 fast idle device
Choke flap in primary barrel
Idle cut off solenoid
Dual choke carburettor of the compound type
Fuel return pipe to tank located on the carburettor top cover
DESCRIPTION 1st choke 2nd choke
Venturi
23 Ref. No. @ 26 Ref. No. @
Main jet 112 Ref. No. @ 120 (under Ref No. @)
Air compensator jet
240 Ref. No. @ 230 Ref. No. @
Emulsion tube F45 Ref. No. @ F25 (under Ref. No. @)
Idling jet 47 Ref. No. @ 50 Ref. No. @
Idling air correction jet
125 70
Accelerator pump jet 40 Ref. No. @
Enrichment device jet (petrol) 130
Enrichment device jet (air) 110 Ref. No. @
Twin fuel float weight 13 -t 0.5 g
Ball type needle valve 1.75 Ref. No. @
Positive opening of 1.35 + 0.05 mm
1st choke butterfly 0
Opening of the strangler flap
with 400 mm Mg (530 nib) 3.75 f 0.25 mm
Idle shut off solenoid Ref. No. @
Air regulating screw Ref. No. @
Mixture control screw Ref. No. @
Throttle opening device Ref. No. @
Adjustments carried out on CCL’POLLU v test bench:
OPENING OF THE THROTTLE BUTTERFLY INITIAL SETTING OF IDLING SPEED
1st choke
2nd choke 1st choke Positive opening
W mrxture screw closed W mixture screw open 2nd choke
1st choke
N 210 K 230 N 265 K 230 Y 280