Engine International HS 2.8L. Manual - part 12

International HS 2.8L

Cylinder Head

5 5

8120081 - 05/02 - Service Manual

INTERNATIONAL ENGINES

5.

Loosen intake manifold lower fixation nuts,
positioned under the exhaust manifold.

6.

Remove intake manifold upper fixation bolts.

7.

Raise intake manifold only, covering the
openings in the cylinder head with a clean
cloth to prevent the fall of any component in
the engine.

Reinstallation

1.

Clean intake manifold contact surface and
reinstall it with a new gasket, in the inverse
order of the removal, tightening bolt within
22 to 28 Nm.

EXHAUST MANIFOLD

Removal

1.

Remove turbocharger, see
TURBOCHARGER - Removal.

2.

Remove exhaust manifold fixation nuts,
removing first lower central nut.

3.

Remove gasket.

4.

Clean contact surfaces.

International HS 2.8L

Cylinder Head

5 6

INTERNATIONAL ENGINES

Reinstallation

1.

Install new gasket on manifold prisoners.

2.

Install exhaust manifold and fix it with the two
upper and the three lower central nuts.

3.

Tighten exhaust manifold fixation nuts
according to specification.

ROCKER ARM

Removal

1.

Loosen rocker arm shaft set fixation nuts
from the edges to the center in 3 steps.

2.

Remove the set.

3.

Remove camshaft push rods marking them
to reinstall in the same position later.

International HS 2.8L

Cylinder Head

5 7

8120081 - 05/02 - Service Manual

INTERNATIONAL ENGINES

Disassembly

1.

Remove rocker arms, springs, brackets and
spacers.

Cleaning and inspection

1.

To clean shaft, remove the plugs of the
edges. Check lubricant, rocker arms and
shaft passage holes, unblocking them if
necessary.

2.

Check rocker arms bushing. If its clearance
with the upper shaft is over than specified,
bushing must be replaced, see clearance in
TECHNICAL SPECIFICATIONS.

3.

Check waste in the ends and warping of the
push rods.

Assembly

1.

Assembly a new plug in the ends of the
removed shaft. Assembly bushing in rocker
arm, making sure that the lubrication holes
are aligned.

2.

Machine the inner diameter of the bushing.

3.

Assembly the connection in rocker arms
shaft.

4.

Assembly springs, brackets and rocker
arms.

Installation

1.

Lubricate the lower edge of the push rods,
making sure that there is a correct fitting in
the tappets.

2.

If the rocker arms support shaft fixation
“prisoners” in the cylinder head have been
removed, assembly and tighten them
according to specification.

3.

Assembly rocker arms shaft set using new
sealing rings. Tighten fixation nuts in three
steps from the center to the ends according
to specification.

International HS 2.8L

Cylinder Head

5 8

INTERNATIONAL ENGINES

VALVES

Disassembly

1.

Remove cylinder head, see CYLINDER
HEAD - Removal.

2.

With tool nr. 8130001, compress springs and
remove valves locks.

3.

Remove springs seats, springs, springs
washers, seals and valves.

4.

While removing or replacing valves, mark
with electric pencil the corresponding number
of each cylinder.

Cleaning and inspection

1.

Remove carbon from combustion chamber,
valve guides and valves. Wash all parts with
solvent.

2.

Check valve rod diameters with micrometer
in three positions.

3.

If the clearance between the rod valve outer
diameter and guide inner diameter is over
than specified replace guide by another, see
VALVE GUIDES.

4.

Check springs.

Assembly

1.

In the assembly, seals must be replaced and
assembled very carefully. Use a compound
of Bisulphet of Molybdenum mixed with
engine oil. Apply a little coat in valve rod.

2.

Install valve in its corresponding guide.

3.

Assembly new seal, spring washers, springs
and spring seats. Lubricate parts in the
assembly sequence.

4.

Compress springs and assembly locks.

5.

Assembly valves covers.