Engine Iveco Vector 8. Manual — part 40

- Rest the cylinder head on the workbench and use tool

99368544 (1) to apply pressure to spring cups (3) so that
by compressing springs (4) valve collets (2) can be
removed.
Then take off upper cups (3), springs (4), caps (5) and
lower cups (6).
Turn the cylinder head upside down and withdraw valves
(7). Repeat the operation on all the cilinder heads.

Figure 75

CYLINDER HEAD
Hydraulic leak test

Before dismantling the cylinder head, carry out the hydraulic
leak test using the appropriate tool.
Pump water heated to approx. 90

˚ C and at a pressure of

4

÷ 5 bar into the cylinder head. Under these conditions, no

leaks should be found; if they are, replace the cylinder head.

Dismantling valves

Figure 76

Figure 77

Check the flatness of the support surface using a rule and a
feeler gauge.

- Remove carbon deposits from valve using a steel brush.

Check that valves do not show signs of binding or
cracking.
Use a micrometer to check that the valve rod diamter is
as specified (see Figure 79). If not, replace the valves.

Figure 78

Checking the cylinder head support surface

VALVE
Removing carbon deposits, and checking the
valves

82266

103214

16824

18625

34

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

VECTOR 8 ENGINES

Base - April 2006

Print P2D32V001E

Figure 79

VALVE GUIDES

These checks are carried out using a magnetic support dial
gauge which is positoned as shown in the figure above.
By rotating the valve check that the centering error does not
exceed 0.03 mm.

Figure 80

Checking valve centering

Figure 81

These checks are carried out using a magnetic support dial
gauge which is positoned as shown in the figure above.
The mounting clearance is from 0.045 to 0.070.

Checking clearance between valve stem

Figure 82

Refacing the valves

MAIN DATA OF THE VALVE SEATS AND VALVE GUIDE

SEATS ON THE CYLINDER HEADS

A = INLET — S = EXHAUST

A. Intake valve on the engines with serial numbers starting up

to 484 - B. Intake valve on the engines with serial numbers

starting from 485

- Check with a micrometer that the diameter of the valve

stems is as indicated; if necessary, rebore the seats on the
valves with the grinding machine, removing as little material
as possible.
After machining, check that the dimensions come within
the permissible tolerance.

A

B

103185

89832

83492

89766

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

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VECTOR 8 ENGINES

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Base - April 2006

Figure 83

Figure 84

Figure 85

- Using the reamer (1), ream the valve guide bore to obtain

the indicated value.

Replacing and regrinding the valve seats

- Dismantle the valve guides (2) with beater 99360143 (1);

mount the new valve guides using a beater 99360143 (1)
fitted with part 99360291 (3).

Replacing the valve guides

Reaming the valve guides

Figure 86

Figure 87

Figure 88

Replace the valve seats as follows:

- place the cylinder head (5) on the pillar drill (1);

- fit tool (4) on the pillar drill;

- adjust the stop device (3) on the milling cutter (2);

- operate the milling cutter and remove the valve seat;

- thoroughly clean the cylinder head.

- cool the new valve seats to — 180

°C in liquid nitrogen;

- drive the valve seats (3) into the cylinder head with a drift

(1) and suitable part (2).

Assembly interference:

- inlet: 0.015 to 0.035 mm

- exhaust: 0.015 to 0.035 mm

- Regrind the valve seats (2) with tool 99305019 (1).

After regrinding the valve seats, use a dial gauge (1) on tool
99370415 to check that:

- the valve recessing is from 0.50 to 0.80 mm.

16830

16833

16834

82263

16835

16832

36

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

VECTOR 8 ENGINES

Base - April 2006

Print P2D32V001E

Figure 89

Figure 90

- Fit the new case (2) in the cylinder head (1) and

cold—head its bottom seat, on the cylinder head, with the
cold—heading tool 99365063 (3).

Figure 91

Figure 92

- Restore the hole in the case (2) with the reamer

99394017 (3) and the bushing 99394019 (1).
Restore the injector recessing, in relation to the face of the
cylinder head, with the milling cutter 99394018 (4) and
bushing 99394019 (1) that must be from 0.47 to 1.16
mm.
Figure 93

Figure 94

PRINCIPAL DATA FOR CHECKING SPRINGS FOR

INTAKE AND EXHAUST VALVE

kg 45± 2,5

kg 80±4

- Before mounting, check the flexibility of the valve spring

using tool 99305047. Compare the loading and
deformation data with those of the new spring indicated
in the following diagrams.

REPLACING THE INJECTOR—HOLDER
CASES

Imperfect coupling between the injector and case, forced into
the cylinder head or between the case and the seat on the
cylinder head, causes a loss of compression or water leakage.

In the first case, the trouble is eliminated by regrinding the seat
of the case (2) with the milling cutter 99394011 (3) and the
bushing 99394019 (1) taking account that the electro—injector
recessing from the cylinder head face must be from 0.47 to
1.16 mm.

In the second case, it is necessary to replace the case as follows:

- thread the case with the set of screw taps 99390800 (1);

- extract the case from the cylinder head with tool

99342145 (2).

1

2

3

1

2

1

2

3

1

2

1

2

3

4

16690

37722

82718

16859

2280

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

37

VECTOR 8 ENGINES

Print P2D32V001E

Base - April 2006