Opening Pressure; Assembly Leak Test; Measuring The Assembly Tightness; Measuring The Opening Pressure - Bosch EFEP 60H Original Instructions Manual

4.3

Opening pressure

!
When the pressure gauge is switched on, allow the
pressure to build up slowly, and, in particular, to
fall slowly, as otherwise the pressure gauge may be
damaged.
i
The opening pressure is specified in the engine's
operating instructions or the test specification sheet
and is to be set accordingly. In individual cases the
opening pressure may also have impacted on the
nozzle holder.

Measuring the opening pressure:

1. Open the shutoff valve on the pressure gauge by half
a turn.
2. Slowly press the manual operating lever downwards
(approx. 0.5 stroke/s).
3. During pumping, observe the pressure at which the
pointer on the pressure gauge stops (nozzle not
chattering) or the pressure suddenly drops (nozzle
chattering).
"
The maximum pressure reached is the opening
pressure.
If the pressure deviates from the specified opening
pressure, either the adjusting screw needs to be turned
(loosen lock nut, adjust, tighten again) or shims need to
be used.
i
Using thicker shims increases the opening pressure,
thinner shims reduce the opening pressure.
4.4 Tightness of fitting
Checking the tightness of fitting:
1. Open shutoff valve by half a turn.
2. Dry off the lower section of the nozzle and the
nozzle holder to ensure that the nozzle can be
assessed reliably.
3. Slowly press down the manual operating lever until
a pressure of 20 bar below the opening pressure
previously read is displayed on the pressure gauge.
"
At this pressure, no drops should emerge from the
mouth of the nozzle within 10 seconds.
i
It is permissible for the nozzle mouth to be slightly
damp. Any leaking oil may not be permitted to falsify
the test.
i
If a drop emerges within 10 seconds, the nozzle and
holder assembly should be dismantled and cleaned.
If a leakage is identified when the check is repeated,
the nozzle and the corresponding components of
the nozzle holder must be replaced by new parts.
!
Reworking nozzle components (nozzle body and
needle) is not permitted.
Robert Bosch GmbH
Testing | EFEP 60H / EFEP 67D | 17
4.5

Assembly leak test

The precondition is that the nozzle has a non-leaking
fitting (see section 4.4).

Measuring the assembly tightness:

1. Close shutoff valve.
2. Rinse the nozzle and holder assembly several times.
3. Open shutoff valve by half a turn.
4. Use the manual operating lever to build up the
system pressure P .
A
i
ISO 4008-3 specifies the following different
setpoints, depending on the opening pressure:
Opening pressure
Opening pressure up to 125 [bar]
Opening pressure above 125 [bar]
5. Release the manual operating lever and measure the
time span for the pressure to drop from P
Opening pressure
Opening pressure
up to 125 [bar]
Opening pressure
above 125 [bar]
6. Refer to the testing instructions for nozzle and
holder assemblies in ESI[tronic] for the permissible
pressure drop times.
i
If the pressure drop time is below the permissible
value, repeat the test twice. Between the individual
tests, the nozzle and holder combination must be
rinsed with the pressure gauge switched off (shutoff
valve closed).
!
If the permissible pressure drop time is not reached
in the repeat tests, the nozzle must be replaced.
Specification P
A
P = 100 [bar]
A
P = 120 [bar]
A
to P .
B C
Specification P Specification P
B
P = 80 [bar] P = 50 [bar]
B C
P = 100 [bar] P = 70 [bar]
B C
|
1 689 979 086 2018-06-08
en
C