Iveco Daily. Manual

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

displacement

150 cm

volume to drain

4.5 litres

chamber diameter

65 mm

rotor diameter

45.5 mm

cam

7.5 mm

number of blades

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

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

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

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

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

AILY

Base - May 2004

Content .. 168 169 170 171 ..

Iveco Daily. Manual - part 170