Bosch EFEP 60H Manual Del Usuario página 18

en 18 | EFEP 60H / EFEP 67D | Testing
4.6 Jet shape
i
For Bosch products, the testing instructions and test
specifications for nozzle and holder assemblies in
ESI[tronic] are binding.
Testing the jet shape:
!
High peak pressures can damage the pressure
gauge.
1. Close shutoff valve
2. Smoothly press down the manual operating lever to
check the jet pattern when spraying.
Additional instructions and criteria:
¶
Double spring holders with sac-less nozzles cannot
be tested.
¶
On hole-type nozzles, all spray holes should have a
finely atomized spray.
¶
Nozzles with a divided or skewed spray are bad and
can no longer be used.
¶
DN..SD nozzles have different jet shapes depending
on their structural design. The jet shape must be
uniform.
¶
DN.. SD.. planar pintle type nozzles have a polished
section on the side of the spray nozzle, which
results in a particular jet shape.
¶
The cross section of the jet from a planar pintle type
nozzle has an oval shape and is larger than the jet
from a non-planar throttle nozzle.
¶
Wear around the seat causes the chatter behavior of
a nozzle to deteriorate.
¶
During the test, a used nozzle must chatter audibly
while operating the lever quickly and/or have a finely
atomized spray.
¶
The jet pattern can deviate from the ideal shape for
a new nozzle without any significant impairment of
the engine's running being noticeable.
¶
Appropriate cleaning methods (e. g. ultrasound
cleaning unit) can be used to visibly improve the jet
pattern of used nozzles.
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1 689 979 086 2018-06-08
4.7 Chatter behavior
i
Information on the chatter behavior, chatter
indicator groups, the spray pattern and the spray
test is available in ESI[tronic] in the test instructions
for nozzle and holder assemblies. The chatter
indicator groups only apply for new nozzles.
Testing the chatter behavior:
!
High peak pressures can damage the pressure
gauge.
1. Switch off the pressure gauge.
2. First of all, move the manual operating lever slowly
until a chattering noise is audible.
 If the nozzle does not chatter, the speed of the
pumping movement must be increased.
"
Chattering indicates that the movement of the nozzle
needle is not inhibited, i.e. the nozzle fitting and guide
are in sound mechanical condition.
!
New nozzles that do not chatter with any pumping
movement (continuous slow movement through to
abrupt fast movement) are unusable and must be
replaced.
Robert Bosch GmbH