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D
E
4
AILY
URO
Figure 297
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 296).
Figure 298
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.
Print 603.93.651
774510
Hydraulic accumulator (rail)
Figure 299
108349
The hydraulic accumulator is mounted on aspiration side
cylinder head.
Its task is to damp pressure oscillations caused:
-
the operation of the high-pressure pump;
-
the opening of the electro-injectors.
Fuel pressure sensor (2) is fitted on hydraulic accumulator (1).
Small valves (throttle valves) or control bushes (3), with ∅ =
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.
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 can be set to zero 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.
108350
151
F1A ENGINE
108387
Base - March 2006
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