56
1973 OPEL SERVICE MANUAL
valve stop screw. Loosen the stop screw until the
valve is completely closed. Turn the screw in
turn from
closed
position, hold, and tighten lock nut.
This is done to insure that the throttle blade will not
stick closed. See Figure
Figure
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
25. With throttle plate completely closed, there
should be no clearance between the pump
and
the pump plunger rod.
26. If a clearance is present, loosen 4 accelerator
Figure
Accelerator Pump Cover
Figure
Accelerator Pump Cover
pump cover retaining screws and allow the
phragm spring to push plunger against lever so that
a zero clearance exists. Then retighten the screws.
See Figures
1 and
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
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
observe the exhaust ports of the pressure relief valve.
See Figure
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 the
carburetor type. If float arm is bent, replace
float.
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