Installing and checking the starting air damper clearance (Opel Kadett D)

The clearance should be adjusted or checked always after removing the carburetor cover or when fuel supply is difficult on a cold engine.

Remove the air filter.

Set the fast idle speed adjusting screw to the upper stage of the cam.

Checking the gap -A- in the automatic starting valve

Starting flap (upper flap) the carburetor must be completely closed.

If it is not closed because the bimetallic spring has not cooled down, close it with a suitable rubber band. With a manual air damper, pull the damper rod out completely.

Using a suitable vacuum pump, create a vacuum in the vacuum opening device.

Check the gap size -A- with a drill with a diameter corresponding to the gap size. Gap size: see paragraph 4.48.



The clearance is adjusted using screw -B-. If the clearance is too small, it is necessary to bend the end of the rod before adjusting it to have sufficient clearance for adjustment between the stop and the secondary air damper lever (retaining valve). See also "Adjusting the secondary chamber air damper".



After adjusting the gap, the vacuum regulator membrane screw must be sealed with varnish.

Checking the gap -B-

Close the valve with a rubber band.



Open the throttle valve slightly and set the adjusting screw to the second stage of the fast idle cam. The screw is at the highest stage.

Open the automatic starter air damper slightly to equalize the gap and then close it again.

Check the air damper clearance -B- using a template or a drill shank, specified values see paragraph 4.48.

To make the correction, remove the carburetor, see p. 4.20.

Remove the automatic cover and bend the connecting rod between the stepped cam and the air damper lever accordingly. As the rod bend increases, the gap -B- decreases.

Install the automatic cover and carburetor.

Check the gap size -A- and adjust if necessary.

Install the carburetor.

Checking the gap size -C-

Close the air damper with a rubber band.

Open the throttle valve fully (give it full throttle).

Using a drill, check the air damper clearance and compare it with the specified value, see paragraph 4.48.



For correction purposes, carefully bend the journal -G- to the right - the gap will increase, to the left - the gap will decrease.

Install the air filter.