Drop Test; Fuel Atomization Condition Test; Thickness Shim Thickness - Nanni T4.155 Workshop Manual

60300140( )
indice A
ADVICE:
* Modifying the thickness of the thickness shim by 0.025 mm
makes the injection pressure change by approx. 471 kPa (4.8
kgf/cm²).
* Only one thickness shim should be used.
e. Verify that no fuel drops are found during post-detection
Hold the pressure at approx. 981 – 1,961 kPa (10 – 20 kgf/cm²) under
the opening pressure, which is adjusted with the controller lever, and
verify that no fuel drops occur for 10 seconds by the injector nozzle or
around the attachment nut.
If a fuel drop is found in less than 10 seconds, replace or disassemble
the injector to clean it and generally overhaul.

FUEL ATOMIZATION CONDITION TEST

a. The injector undergoing the test must shake when the
controller lever is operated at a rate of 15 to 60 times
(reinstalled injector) or 30 to 60 times (new injector) per
minute.
b. Verify the shape of the fuel atomization jet when the injector
shakes.
c.
If the shape of the fuel atomization jet is not satisfactory, replace or
clean the injector.
4 CYLINDERS WORKSHOP MANUAL

Thickness shim thickness

DROP TEST

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