1973 OPEL MANTA carburetor

6E. 521973 OPEL SERVICE MANUAL
Figure 6E-15 Adjusting Accelerator Cable
Depress accelerator pedal until pedal lever touches
floor mat. The carburetor throttle valve must now be
completely opened.MAJOR REPAIR
REMOVE AND INSTALL CARBURETOR1. Remove air cleaner.
2. Remove fuel and vacuum hoses from carburetor
fittings.
3. Remove choke wire.Figure 6E-16
Bowden Control Wire Adjuster and
Segmental Disc
4. Disconnect throttle linkage by removing lock pin
and unsnapping ball socket from ball on end of throt-
tle shaft.
5. Remove carburetor by removing four nuts and
lockwashers.
Install in reverse order, noting the following:
1. Prior to carburetor insta!lation, place a new gasket
on intake manifold.
2. Make certain that all nuts and screws on the car-
buretor are securely tightened.
3. Make sure that choke housing is set on index and
that choke valve is nearly closed at room tempera-
ture. See Figure
6E-17. Make sure choke valve is free
in all positions.
Figure
LiE-17 Choke Housing Set on Index

CARBURETOR AND THROTTLE LINKAGE6E- 63
4. Adjust engine idle speed and mixture
CAUTION: : Make sure choke valve opensfully before starting idle adjustment.
THROTTLE LINKAGE REMOVAL
Removal
Opel 1900 and Manta Series1. Remove control wire from bracket and unhook it
from segmental disc. See Figure
6E-16.2. In passenger compartment, unhook wire with ball
and plastic bushing from accelerator pedal lever. See
arrow in Figure 6E- 18.
Figure 6E.18 Unhook Wire in Passenger
Compartment3. In engine compartment, pull bowden control wire
out of bracket on dash panel.
If bowden control wire is kinked or damaged in any
way, it must be replaced.
1. Feed ball and plastic bushing from engine com-
partment through opening in dash panel and hook in
accelerator pedal lever. See Figure
6E-19.2. Lightly pull wire core so that the plastic bushing
slips into bore of accelerator pedal lever.
3. Hook bowden control wire in segmental disc and
attach control wire to bracket.Figure
6E-19 Installing Ball and Plastic Bushing
4. Adjust control wire.
OVERHAUL CARBURETORDisassembly
1. Remove outer nut from end of throttle lever to
choke link. See Figure
6E-20.
Figure 6E-20 Removing Choke Link
2. Pry off vacuum case connecting lever. See Figure
6E-2 1.3. Unscrew carburetor cover.
4. Screw float needle valve out of carburetor cover
and take off copper seal ring.

6E- 541973 OPEL SERVICE MANUAL
Figure 6E-21 Removing Vacuum Case Lever
5. Unscrew vacuum diaphragm cover from choke
housing. See Figure
6E-22.Figure 6E-22 Removing Vacuum Diaphragm Cover
6. Unscrew retaining ring from automatic choke
body and take off cover.
7. Unscrew vacuum diaphragm case from carbu-
retor cover. Remove reduction jet. See Figure 6B23.
8. Take float together with spindle and leaf spring
from float chamber.
9. Pull accelerator pump discharge nozzle assemblyFigure 6E-23 Removing Vacuum Case Reduction Jet
out of carburetor housing. Nozzle is press fitted. See
Figure 6E-24.
GATOR PUMPISCHARGE NOZZLE
Figure 6E.24 Removing Accelerator Pump Discharge
10. Remove primary idle jets and secondary idle
plug. Remove primary and secondary high-speed air
jets.
11. Remove primary and secondary main metering
jets.
12. Remove cotter pin from pump connecting rod.
Remove accelerator pump.
13. Remove idle mixture adjusting screw from throt-
tle valve body. Remove idle air adjusting screw from

CARBURETOR AND THROTTLE LINKAGE6E- 55
float chamber. Clean all parts and blow out with
compressed air. Replace gaskets and seal rings.
14. Check actuating parts in automatic choke body,
including diaphragm, for wear. Check pull rod for
free operation. See Figure 6E-25.15. Remove choke assembly by removing choke
valve and 2 choke housing
- to - carburetor screws.
Figure 6E-25 Checking Automatic Choke Parts
16. Check vacuum case assembly. If bushing is worn,
replace vacuum case assembly. See Figure 6B27.
Figure
6E-27 Checking Vacuum Case Brass Bushings
17. Install secondary vacuum diaphragm case assem-
bly. See Figure 6B28.
18. Install gasket and shield between automatic
choke cover and automatic choke body.Figure
6E-28 Installing Vacuum Case Assembly
19. Install automatic choke cover so that the catch
of the
b&metal spring is positioned onto bent end of
the intermediate lever. See Figure 6B29.
Figure 6G29 Installing Automatic Choke Cover
20. Align and tighten automatic choke cover. Choke
valve should be nearly closed at room temperature.
21. Check vent valve for free operation. Valve rod
must not be bent.
22. Screw in jets according to calibration table.
Never interchange parts of the primary and
second-
xy barrel. See Figure 6E-37.23. Install the throttle body to the bowl, using new
throttle body gasket. Adjust secondary throttle valve
gap by loosening lock nut on the secondary throttle

6E- 561973 OPEL SERVICE MANUAL
valve stop screw. Loosen the stop screw until the
valve is completely closed. Turn the screw in l/4turn from closed position, hold, and tighten lock nut.
This is done to insure that the throttle blade will not
stick closed. See Figure
6E-30.PUMPFigure 6E-30 Adjusting Secondary Throttle Valve Gap
24. Install accelerator pump connecting rod in lower
hole of primary throttle shaft lever and cotter pin in
outboard hole at accelerator pump actuating lever
end. Paying attention to proper arrangement of cot-
ter pin and washers. See Figure
6E-2.25. With throttle plate completely closed, there
should be no clearance between the pump levei and
the pump plunger rod.
26. If a clearance is present, loosen 4 accelerator
Figure
6E-31 Accelerator Pump CoverFigure 6C32 Accelerator Pump Cover
pump cover retaining screws and allow the
dia-’phragm spring to push plunger against lever so that
a zero clearance exists. Then retighten the screws.
See Figures
6E-3 1 and 6E-32.27. Insert accelerator pump discharge nozzle so that
the bent tube end points into suction channel of the
primary barrel.
28. Fill the bowl with fuel.
29. With fuel in bowl, slowly open the throttle and
observe the accelerator pump pressure relief valve
exhaust ports and where it seats into the bowl. See
Figure
6E-33. Fuel should not be bleeding back into
the bowl from the exhaust ports or where the relief
valve seats, but a steady stream of fuel should dis-
charge from the discharge nozzle.
30. With fuel in bowl, rapidly open the throttle atid
observe the exhaust ports of the pressure relief valve.
See Figure
6E-33. Fuel should~exhaust’from the ac-
celerator pump pressure relief valve exhaust ports.
3 1. If the pressure relief valve malfunctions, remove
it and replace with a new one.
32. No float adjustment is possible, so check position
of float arm by comparing with a new float of thesame carburetor type. If float arm is bent, replace
float.

CARBURETOR AND THROTTLE LINKAGE6E- 57
ACCELERATOR PUMP
PRESSURE RELIEF
VALVE SEAT
ALVE
VENT DISCHARGE
(AIR BUBBLES FROM THIS
HOLE
IS NORMAL)
PUMP INLET
VALVE EXHAUST
PORT
--6E-33
Figure 6E-33 Carburetor Fuel Bowl
33. Install float and pivot rod making sure rod is
seated in casting.36. Install new air horn gasket so that the holes in
the gasket coincide with the screw holes in carbu-
retor housing. See Figure
6E-35.34. Install leaf spring so that spring ends rest on float
spindle. See Figure
6E-34.37. On vent valve, pay attention to cotter pin position
and arrangement of washers.
3.5. Screw in float needle valve together with copper38. Basic adjustment of idle mixture adjusting screw
seal ring
(.08 in. thick).is 5 turns open.

6E- 581973 OPEL SERVICE MANUAL
Figure 6E-34 Leaf Spring Installed
1 6E-36
Figure 6E-36 Checking Vent Valve Adjustment
39. Check compression of vent valve lower spring. It
should be compressed
l/4 inch with throttle valve
completely closed. See Figure
6E-36.40. Correct by bending valve lever.
Figure
6E-35 Installing Cover Gasket
SPECIFICATIONS
GENERAL SPECIFICATIONSCompression Ratio
........................................................................................................7.6 to 1
Fuel Required
................................(...........................................................................Low Lead
Fuel Tank Capacity (Gallons)
Opel1900andManta..
....................................................................................................11.9
GT...................................................................................................................................13.2Fuel Gauge Type
........................................................................................................Electrical
FuelPumpType
......................................................................................................Mechanical
FuelPumpDrive
..................................................................................EccentriconCamshaft
Fuel Pump Pressure at 1950 RPM
......................................................................3.1 to 3.7 psi
FuelFilter
............................................................................................................In-LineFilter
CarburetorMakeandType................................................I-Solex2BBLAutomaticChoke
AirCleanerElementType
..........................................................................FiberMesh-Paper

CARBURETOR AND THROTTLE LINKAGE6E- 59
Figure 6E-37 Carburetor Specifications