Iveco Daily Euro 4. Manual

108441

88339

88340

88341

Figure 198

Figure 199

Figure 200

Figure 201

Fit the thermostat casing (2) with a new seal and tighten the
fixing screws (3) to the prescribed torque.

Fit the temperature sensors (1) and tighten them to the
prescribed torque.

Fit the brackets for lifting the engine and tighten the fixing
screws to the prescribed torque.

Remove the screws (2 and 3) and the covers (1 and 4)
together with the over-head seal rings.

Remove the nuts (4) and the top skid (3).
Remove the screws (1) and the shoulder plate (2).

Tilt the over-head (1) and take care not to damage the seats,
then take off the camshafts (2 and 3) from the overhead.

540650

Overhead

Overhead removal

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Description

The timing system is the type with a twin camshaft in the head
and four valves per cylinder with hydraulic tappets.

The control is transmitted by two chains:
- a double chain by 3/8” is set in motion by the driving shaft

and sets the control shafts in motion: oil pump/depressor
— high pressure pump;

- a single chain is set in motion by the high pressure control

shaft gear and sets the camshafts in motion.

The camshaft gears are mutually interchangeable and are
fitted with slots to make it possible for the phase sensor to
detect the phase.
The rocker arms, one for the valve, are kept in contact with
the corresponding cam by an hydraulic tappet, thus
eliminating the need for regular adjustments.

88055

108432

Figure 202

Figure 203

Figure 204

TIMING SYSTEM AND AUXILIARY SYSTEM DIAGRAM

1. Camshaft control gear - 2. Single chain - 3. Hydraulic

chain stretcher with anti-return device - 4. Chain -

5. Hydraulic belt stretcher - 6. Drive gear on driving shaft -

7. Fixed skid - 8. Oil pump/depressor control shaft gear —

Hydraulic power steering pump - 9. Double chain -

10. High pressure pump control shaft gear.

5412

TIMING SYSTEM

NOTE

HYDRAULIC BELT STRETCHER

WITH ANTI-RETURN DEVICE

A = Max. range: 76.9 ± 0.4 mm
B = Piston engaged: 53.6 mm
C = Min. travel for piston disengagement: 2.3 mm
D = Working travel: 24.5 mm

Both chains shall be replaced, even though the
anomaly affects only one chain: in this case, gears
(8-10), pads (7) and belt stretchers (3 and 5) shall
also be replaced (see figure 204).
Hydraulic belt stretcher (5) with anti-return device
shall be replaced every time it is disassembled. In
fact the belt stretcher cannot be assembled back
into place after the piston has come off the
hydraulic belt stretcher housing.

1. Rocker arm - 2. Reaction hydraulic tappet -

3. Valve assembly - 4. Camshaft on exhaust side -

5. Camshaft on suction side - 6. Camshaft control chain.

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Figure 205

87804

TIMING SYSTEM DIAGRAM

541210

Camshaft

Checks

The surfaces of the shaft supporting pins and of the cams
must be finely honed; if there is any sign of meshing or scoring,
replace the shaft.

75474

Figure 206

Using a micrometer (1), measure the diameter of the pins (2)
of the camshaft and, using a bore meter, measure the
diameter of the supporting seats in the overhead.
The difference between these two measurements gives the
existing clearance.
The nominal assembly clearance is 0.037

÷ 0.088 mm.

87806

Figure 207

541211

Checking cam lift and pin alignment

Place the shaft (1) on the parallels and use a centesimal dial
gauge fitted on the central support to check that the
alignment error does not exceed 0.04 mm; otherwise,
change the shaft. Check also the cam lift: it must correspond
to the prescribed value; if different values are detected,
change the shaft.

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87807

Figure 208

MAIN DATA, CAMSHAFT PINS AND SEATS

1. Intake valve camshaft seats — 2. Exhaust valve camshaft seats — 3. Intake valve camshaft — 4. Exhaust valve camshaft.

The camshaft (3) of the suction valves can be recognised through the spring cup (4) and the dowel (6).

NOTE

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Iveco Daily Euro 4. Manual - part 65