New Holland CX720 Repair Manual page 1918

3. Spray Pattern - Pump the tester rapidly (80 to 90
strokes per/min.) and observe the spray pattern from
the holes. An atomized spray (1) free from distortion
and irregular streaks of fuel should be observed. A
non uniform or split stream spray (2) is not accept-
able.
NOTE: The tester is not regarded as providing a suitable
test for atomization under working conditions, but gives an
indication of the working of the nozzle.
4. Nozzle Seat Leakage - Wipe the nozzle tip dry and
apply a pressure 10 bar (145 lbf/in2) below the
opening pressure. The nozzle tip and bottom face
must remain essentially dry and there must be no
tendency for blobs of fuel to collect or drip. A slight
dampness can be ignored. If there is any leakage
from the nozzle seat, the nozzle assembly must be
cleaned or replaced.
5. Nozzle Back Leakage - Apply a pressure 10 bar (145
lbf/in2) below the opening pressure, then release the
handle and time the pressure drop. The pressure
should drop 100-150 bar (1450-2175 lbf/in2) in 5-45
seconds . If below (5), the nozzle assembly must be
replaced. If above 45 seconds, check for carbon on
the valve and/or blocked back leak drillings.
NOTE: If the injectors meet the tests carried out then refit
the injectors to the engine.
POWER PRODUCTION - FUEL AND INJECTION SYSTEM
2 4/7/2006
B.20.A / 88
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