Fuel spray torch
The initial injection pressure is adjusted by installing a shim under the spring. Increasing the shim thickness increases the injection start pressure, decreasing it decreases it. Changing the shim thickness by 0.01 mm changes the injection start pressure by approximately 1 kg/cm².
A mandatory condition for the nozzle operation is the quality of spraying. The spray torch must be uniform across the entire cross-section of the spray cone, and the spray must be mist-like.
The beginning and end of the injection should be clear. In new injectors, the injection is accompanied by a sharp sound. In working injectors, the absence of this sound is not a sign of a malfunction.
The original text is provided on an online resource: FORDBOOK