MAINTENANCE MANUAL OF ENGINE
135
6. Inspecting atomization by the fuel injector
Cause:
Black smoke from the diesel engine, insufficient
power, increase in fuel consumption and other trou-
bles.
Equipment:
Pressure tester, open-end spanner , fuel injector test
bench
Test steps and adjustment:
1. Get the fuel pressure increased to 10.78Mpa by
turning the pump manually, and then slowly pump
the fuel, so as to make the pressure increased to the
nominal fuel injection pressure, and then observe
whether there is oil dripping or leakage from the
fuel injection nozzle orifice; if there is still fuel
dripping after being tested for many times, it is re-
quired to dismantle the fuel injection nozzle, and
clean, inspect, grind or replace it, and then re-test it
again.
2. Adjust the fuel injection pressure, remove the
fuel injector adjusting screw cap, and unscrew or
tighten the pressure adjusting screw, so as to enable
the fuel injection pressure to meet the nominal val-
ue, and then tighten the pressure adjusting screw
cap, and re-test it.
3. Observe the fuel atomization quality, and carry
out atomization test at a rate of about one time per
second; the fuel spray should be fine and even at-
omized fuel, without visible splashed fuel, partial
density unevenness or single-side fuel injection;
when the fuel is cut off, there is an obvious clear
sound.
Specification
Fuel injection pressure value: 24-25MPa
Test results:
If failed to reach the fuel injection pressure, the
fuel injector nozzle has to be cleaned, ground, or
replaced with a new one.
Summary of Contents for KM/4L22
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