ANHUI QUANCHAI ENGINE CO., LTD
5. Atomization of fuel injector
Reason:
Faults of diesel engine such as black smoke,
insufficient power, and rising fuel consumption.
Equipment:
Pressure test gauge and open end wrench
Connection:
The pressure test gauge is connected to the pump
connector.
Test steps and adjustments:
1) Pump fuel by hand until the gauge pressure is
10.78 Mpa, continue to slowly press the hand
pump, raise the gauge pressure to the calibrated
pressure and inject oil. Observe that whether
there is oil drip or leakage at the nozzle orifice. If
there is still oil drip after many tests, remove the
nozzle fitting for cleaning, inspection and
grinding, and then conduct tests again.
2) Adjust the injection pressure, remove the fuel
injector to adjust nuts, loosen or tighten the
pressure-adjusting screw to make the injection
pressure conform to the calibrated value, then
tighten the pressure regulating nut and conduct
retest.
3) Observe the spray quality and conduct
atomization test at a speed of about once per
second. The fuel mist shall be even and free of
visible splashing oil foam, uneven concentration
and single-side injection. There shall be clear and
crisp sound when the fuel is cut off.
Specification
Opening pressure value of fuel injector: 24-25
MPa
Test results:
If the injection pressure cannot be reached, the
nozzle fitting shall be cleaned, ground or replaced
with new qualified fuel injectors.
Summary of Contents for N485D
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