a) Install the injector on the test stand.
b) Pump the fuel injection lever quickly several times to create pressure to clear the nozzle opening.
Slowly pump the lever and use the pressure gauge to determine the pressure at which the needle begins to rise.
Needle lift start pressure:
- used nozzle - 135-155 bar
- new nozzle - 145-155 bar
Note: When the injector is working properly, a clear, distinctive cut-off sound should be heard.
If the needle lift start pressure does not correspond to the specified values, adjust it by selecting an adjusting washer of the required thickness.
Note:
- - Adjusting washers have a size of 43 (thickness values) from 0.900 mm to 1.950 mm in 0.025 mm increments.
- - Changing the thickness of the adjusting shim by 0.025 mm results in a change in injection pressure of approximately 3.75 bar.
- - Only one adjusting washer should be used.
- - When adjusting the injection pressure, use the data for the new injectors.
d) After injection is complete, no fuel leakage should be observed.
Check the injector needle for leaks. Create a pressure of 10-20 bar on the injector testing stand (0.981-1.961 kPa) less than is required to open the injector needle. There should be no fuel leakage from the nozzle hole or around the injector coupling nut for 10 seconds.
If fuel leakage is observed, replace or repair the injector.
3. Checking the cutting shape.
a) Set the rotation speed of the fuel injection pump drive shaft (on the fuel stand) 15-60 rpm (used nozzles) and 30-60 rpm (new injectors).
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b) Check the correct spray pattern.
