Vacuum regulator for opening the automatic air damper — removal, installation and adjustment (Opel Astra F)

Main diaphragm assembly

Disconnect the negative battery terminal, air cleaner hoses and remove the air box.

Disconnect the diaphragm assembly vacuum tubes.

Using a suitable punch with a thin cylindrical end, knock out the round pin (axis of rotation) fastening the diaphragm assembly to the top cover of the carburetor.

Mark the position of the housing marks, bimetallic. spring, to make it easier to install later, then unscrew the three screws and lift the spring housing. Move it to the side, trying not to stretch the hoses or electrical wiring of the air damper heater.

Remove the three screws securing the choke assembly to the carburetor body. Let the choke assembly hang down, but do not disconnect the choke linkage.

Remove the star clamp securing the diaphragm assembly to the carburetor cover and pull out the diaphragm assembly.

Installation is the reverse of removal, but a new star-shaped clamp must be installed to secure the diaphragm to the top cover of the carburetor. Before installing the airbox on the top of the carburetor, check and, if necessary, adjust the choke opening as described in this section.

Secondary air damper opening solenoid

The solenoid works in conjunction with the carburetor primary chamber diaphragm.

Disconnect the negative battery terminal, air cleaner hoses and remove the air box.

Disconnect the vacuum tube of the diaphragm device.

Disconnect the wiring, then remove the screw and separate the solenoid and its bracket from the carburetor. Remember that the screw also secures the ground wire.

Installation is carried out in the reverse order of removal. Check that the ground wire is in place under the solenoid bracket screw.

Adjusting the vacuum device for opening the air damper

After removing the air box from the top of the carburetor, the procedure is as follows.

Note the position of the marks on the bimetallic spring housing, then remove the three screws and lift the spring housing. Move it to the side, being careful not to stretch the cooling hoses and the air damper heater wiring.

Set the fast idle adjustment screw to the highest step of the cam and check that the choke is closed.



Move the lever towards the diaphragm device, pressing the adjusting screw until it stops. Keep the lever in this position.



Using a drill bit of the appropriate diameter or similar tool, measure the clearance between the underside of the throttle body and the wall of the primary chamber diffuser. It should match the specification under "small clearance" ("Carburetor Parameters. Clearance of Half-Opened Choke").



If adjustment is necessary, turn the adjusting screw in the appropriate direction with an end wrench.

Now push the opening lever towards the diaphragm device until it stops and hold it in this position.

As above, measure the gap between the underside of the air damper and the wall of the primary chamber diffuser. It should match the specification under "Large Clearance".

If adjustment is necessary, turn the adjusting screw in the appropriate direction.

Attach the bimetallic spring to the air damper lever, install its housing on the damper housing and "tighten" the mounting screws. Align the marks on the spring housing and the damper housing, then tighten the screws.

Install the air box on the top of the carburetor after completing the adjustment.

[Original posted on the website: www.opelbook.ru]