new booster venturi gasket and the booster venturi in the main body. Position the air distribution plate, if so equipped, and Install the accelerator pump discharge screw (Fig. 2.5).
18. Install the fuel inlet filter screen, and the fuel Inlet fitting and gasket.
Vacuum piston stroke
1. If the choke piston and link was disassembled install the choke piston on the choke thermostatic spring lever link and install the retaining pin (Fig. 31).
2. Position the over-travel lever on the thermostatic choke shaft and lever assembly (Fig. 31). The bottom of the over-travel lever adjusting screw must rest against the tang on the choke shaft lever. Insert the choke shaft assembly into the rear of the choke housing. Position the choke shaft lever so that the hole in the lever is to the left side of the choke housing.
3. Insert the choke piston into the choke housing, and install the choke thermostatic spring lever on the flange of the choke shaft. Install the choke thermostatic spring lever to shaft retaining screw and washer (Fig. 20).
4. Install the fast idle cam rod on the over-travel lever. Place the fast idle cam on the fast idle cam rod and install the retainer. Place the choke housing vacuum pick-up port to the main body gasket on the choke housing flange. Position the choke housing on the main body and at the same time, install the fast idle cam on the hub on the main body. Position the gasket, and Install the choke housing retaining screws. Install the fast idle cam retainer. The thermostatic spring housing is installed after the choke plate has been adjusted to its clearance given in the Data Section, under Fuel System.
Air horn
Refer to Fig. 18 for the correct location of the parts.
1. If the choke plate shaft was removed, position the choke plate shaft in the air horn. Place the two brass washers and slide them into position on the choke control rod seal retainer.
Insert the choke control rod through the control rod seal and the air horn. Insert the choke control rod into the choke shaft lever clevis nut, and turn the nut clockwise to thread the rod onto the nut.
2. If the choke plate was removed, insert the choke plate into the choke plate shaft. Install the choke plate screws snug, but not tight. Check for proper plate fit, binding in the air horn and free rotation of the shaft by moving the plate from the closed
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position to the open position. If necessary, remove the choke plate and grind or file the plate edge where it is binding or scraping on the air horn wall. If the choke plate and the shaft moves freely, tighten the choke plate screws while holding the choke in the fully-closed position. Stake the screws. When staking the screws, support the shaft and plate on a block of wood or a metal bar to prevent bending of the shaft.
3. Position the air horn gasket on the main body, with the fuel bowl vent hole in the gasket located op-posite the fuel inlet valve.
4. Position the air horn over the main body and Insert the end of the choke lever rod into the automatic choke shaft lever. Install the air horn retaining screws and the carburettor identification tag. Tighten the retaining screws. Install the choke lever rod retainer. Install the air cleaner anchor screw.
5. Refer to “Adjustments” In this section and perform the automatic choke plate clearance (pull-down) and fast idle cam linkage adjustment. Perform a fuel level float adjustment (wet) after the carburettor has been installed on the car.
Power valve
A power valve must not be replaced unless it is leaking sufficiently to cause an unstable engine idle condition. Leakage In the power valve area can be caused by an improperly tightened cover or defective gaskets. Any defect in the gasket sealing qualities must be corrected before the power valve is replaced.
Power valve leakage that causes an unadjustable rough engine Idle condition can be diagnosed, In most Instances, by the fact that the Idle mixture needle(s) must be nearly, or completely seated in order to obtain a re-latively smooth engine idle condition, If power valve leakage Is suspected, the following test procedure must be performed.
1. Remove the carburettor from the intake manifold. Invert the carburettor.
2. Remove the glass bowl from the fixture (Fig. 33). Fill the bowl half-full of water. Install the bowl on the fixture.
3. Connect a line from the vacuum pump to the fitting on top of the fixture. Insert the large OD end of the wand into the tube and attach the other end of the tube to the fitting on the side of the fixture. Slip the rubber gasket (furnished with the tool) over the small OD end of the wand. Hold this end against the power valve vacuum pick-up port (Fig. 33).
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