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306
F1C ENGINE
Figure 340
Mount pressure regulator (1) on high pressure pump (2).
NOTE
Mounting operation must be performed keeping
the regulator perpendicular to connection plane
without angling it, in order not to damage seal rings
(1-2, Figure 339).
Figure 341
Screw up screws (1) and tighten them at 6 ÷ 7 Nm (0.6 ÷ 0.7
kgm) torque.
NOTE
Where pressure regulator is replaced on the engine
mounted on the vehicle, it is needed, after
replacement, to check that there are no fuel leaks
after an engine working period.
Base - March 2006
774510
Hydraulic accumulator (rail)
Figure 342
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The hydraulic accumulator is fitted on the cylinder head on the
suction side.
With its volume of approximately 23 cm
pressure ripples of the fuel due to:
- the operation of the high-pressure pump;
- the opening of the electro-injectors.
On the hydraulic accumulator (1) there is the fuel pressure
sensor (2).
Fuel pressure sensor (2) is fitted on hydraulic accumulator (1).
Small valves (throttle valves) or control bushes (3), with "j" =
0.85 mm, have been fitted to the fuel delivery couplings, which
control the fuel pressure waves generated by the
high-pressure pump. Their function is to protect the electric
injectors by reducing their wear in time.
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Fuel pressure sensor (2) may affect the accuracy of the injector
minimum flow rate correction, since the minimum flow rate
depends both on the injection time and the actual pressure of
the hydraulic accumulator.
In case of replacement, the EDC control unit 16 correction
coefficients (ZFC) shall be set to zero.
The correction coefficients (ZCF) can be corrected by means
of the IVECO MODUS - E.A.SY. - IT 2000 diagnosis
instruments, by programming the control unit again and
performing the sensor replacement procedure, in accordance
with the instructions given by the diagnosis instruments.
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AILY
URO
108387
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