Iveco Daily. Manual — part 170
88626
88627
88058
Figure 232
Figure 233
Figure 234
1. Oil input pipe from cylinder block - 2. Oil suction pipe -
3. Oil pressure adjusting valve - 4. Oil delivery pipe -
5. Depressor air suction pipe - 6. Depressor oil suction
pipe.
Pressure at opening start:
4.4 bar
Description of oil pressure adjusting valve closed
If in pipe C the oil pressure is below 4.4 bar, the valve (1)
closes the holes D - E.
Oil pressure adjusting valve open
If in pipe C the oil pressure is equal or above 4.4 bar, the valve
(1), as a result of the pressure itself, wins through the spring
reaction (2) and goes down, thus opening communication
between the delivery pipe A and the suction pipe B, through
draining holes D-E, and therefore the pressure drops.
When the pressure falls below 4.4 bar, the spring (2) takes
the valve (1) to the initial position of closed valve.
Use the suitable wrench to remove the oil pressure adjusting
valve (1) from the oil pump.
Vacuum pump
The vacuum pump (2, Figure 228), with radial blades, is also
incorporated in the GPOD (1, Figure 229). It is driven directly
by the oil pump.
transmission ratio
1
displacement
150 cm
3
volume to drain
4.5 litres
chamber diameter
65 mm
rotor diameter
45.5 mm
cam
7.5 mm
number of blades
3
height
34 mm
vacuum pump minimum speed
780 rpm
vacuum pump max. speed
3500 rpm
vacuum pump over-revs
4200 rpm
vacuum pump forced over-revs
4900 rpm
theoretical flow rate at minimum (air)
- l/min
actual flow rate at minimum (air) —
at atmospheric pressure
- l/min
Theoretical speed at max. speed — (air)
- l/min
Actual flow rate at max. speed — (air)
at atmospheric pressure
- l/min
measured power draw (maximum)
speed
3500 rpm
torque
- Nm
power draw (calc.)
- W
543475
Oil pressure adjusting valve
Disassembly
576
F1C ENGINE
D
AILY
Base - May 2004
°C — engine speed 780 rpm
(pump speed 994 rpm)
tank
(litres)
vacuum
(bar)
0.5
0.8
4.5
time (sec)
4.5
12.5
9
time (sec)
9.5
26.0
88059
88060
88061
88773
Figure 235
Figure 236
Figure 237
Figure 238
PARTS COMPRISING THE OIL PRESSURE
CONTROL VALVE
1. Split ring — 2. Valve — 3. Spring — 4. Valve casing.
Use the suitable pliers to remove the snap ring (1), take off
the valve (4) and the spring (3) from the valve body (2).
MAIN DATA OF THE OIL PRESSURE CONTROL
VALVE SPRING
Oil filter with built in by-pass valve — differential opening
pressure 2.5
± 0.2 bar.
HEAT EXCHANGER COMPONENT DETAILS
1. Heat exchanger made up of five elements - 2. Gasket -
3. Box - 4. Pipe union - 5. Screw - 6. Oil filter support - 7.
Screw - 8. Heat exchanger box - 9. Gasket.
Disassembly
Remove the screws (5) and take off the heat exchanger (1)
from the box (3) with the gasket (8).
Remove the screws (7) and take off the oil filter support (6)
from the box (3).
Assembly
For refitting, reverse the removal operations and observe the
following warnings.
Clean accurately the heat exchanger (1).
Always change the gaskets (2, 9 and 8). Apply LOCTITE 577
on the threading of the pipe union (4) (if removed), drive it
in the support (1) and tighten it to the prescribed torque.
Tighten the screws to the prescribed torque.
Assembly
For refitting, reverse the removal operations.
543070
Oil filter
543110
Heat exchanger
F1C ENGINE
577
D
AILY
Base - May 2004
88686
88685
88687
88688
Figure 239
Figure 240
Figure 241
Figure 242
HEAT EXCHANGER SECTIONS
Oil flow from heat exchanger to oil filter
Oil flow from oil filter to cylinder block
Oil flow from cylinder block to heat exchanger
578
F1C ENGINE
D
AILY
Base - May 2004
Figure 243
540480
Oil vapour recirculation (Blow-by)
Part of the gas produced by the combustion during the
engine operation blows by the piston snap ring ports, in the
oil sump, and mixes with the oil vapours present in the oil
sump. This mixture, conveyed from the chain compartment
to the top, is partially separated from the oil by means of a
device situated on the top side of the distribution cover and
is introduced in the air suction system. This device consists
mainly of a rotating filter (3), fit flush on the stem (1), a high
pressure/shaft control and a cover (2) where the valves (4
and 5), usually closed, are fitted. The diaphragm valve (4)
regulates the partially purified mixture and keeps the pressure
inside the chain compartment around a value of ~ 10
÷ 15
mbar.
The umbrella valve (5) discharges some of the oil still present
in the mixture coming from the filter (3) in the chain
compartment and the oil condenses in the chamber (6).
Operation
The mixture which passes through the rotating filter (3) is
partially purified from the oil particles, as a result of
centrifugation, and so these particles condense on the cover
walls to return to the lubrication circuit. The resulting purified
mixture is let in through the stem holes (1) and the
diaphragm valve consensus (4) inside the air vent upstream
of the turbocharger. The opening/closing of the valve (4)
depends mainly in the ratio between the pressure operating
the diaphragm (4) and the depression below it. The oil still
present in the mixture coming from the rotating filter (3) and
which condenses in the chamber (6) is drained into the chain
compartment through the umbrella valve (5), when the
pressure that keeps it closed drops as a result of the engine
stop.
88062
Gas with oil level above 10 g/h
Gas with oil level ~ 0,2 g/h
Condensed oil returning to the oil sump
F1C ENGINE
579
D
AILY
Base - May 2004
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