Iveco Stralis AT/AD. Manual

44925

The cams of the camshaft control the rocker arms directly: 6 for the injectors and 12 for the valves.
The rocker arms run directly on the profiles of the cams by means of rollers.
The other end acts on a crosspiece that rests on the stem of the two valves.
There is a pad between the rocker arm adjustment screw and the crosspiece.
There are two lubrication ducts inside the rocker arms.
The length of the rocker arm shaft is basically the same as that of the cylinder head. It has to be detached to be able to reach
all the parts beneath.

Figure 140

49033

Lubricate the valve stems and insert them in their respective
valve guides. Mount the bottom plates (3) with the key
99360328 and the oil seal (1) on the valve guides (2). Then
go ahead and mount the valves as follows:

Fitting valves and oil seal

47583

- Mount the springs (6) and the top plate (5).

- Fit the tool 99360261 (2) and secure it with the bracket

(4). Screw down the lever (1) to be able to fit on the
cotters (3). Take off the tool (2).

Figure 141

5412

ROCKER SHAFT

Figure 142

TRALIS

AT/AD

186

F3A ENGINE

Base - January 2003

73539

Figure 143

44914

44912

44913

Figure 144

Figure 145

Figure 146

PUMP INJECTOR ROCKER ARMS

INTAKE VALVE ROCKER ARMS

Check the surfaces of the bushings, which must show no
signs of scoring or excessive wear; if they do, replace the
rocker arm assembly.

EXHAUST VALVE ROCKER ARMS

Rocker arms

SECTION A-A

SECTION B-B

SECTION A-A

SECTION B-B

SECTION A-A

SECTION B-B

42,

015

42,

071

42,

025

42,

041

56,

030

56,

049

Check that the surface of the shaft shows no scoring or
signs of seizure; if it does, replace it.

MAIN DATA OF THE ROCKER ARM SHAFT

187

TRALIS

AT/AD

F3A ENGINE

Shaft

47586

47595

60632

Figure 147

Figure 148

Figure 149

Figure 150

Fix the engine block to the stand 99361036 by means of
brackets 99322230.
Install the cylinder liners as described in page 158.

Mount the oil nozzles (2), making the grub screw coincide
with the hole (3) in the crankcase.

Place the half-bearings (1) on the main bearings in the
underblock (2).

By means of suitable equipment (1) apply silicone LOCTITE
5699 to the block, as shown in the figure.

Sealant application diagram.

Fit the underblock within 10’ of the application of the
sealant.

47570

Figure 151

Lubricate the half bearings, then install the crankshaft (2) by
means of hoist and hook 99360500 (1).

49021

Not finding it necessary to replace the main bearings,
you need to fit them back in exactly the same
sequence and position as in removal. If they have to
be replaced, choose the main bearings according to
the selection described on pages 53, 54, 55, 56, 57.

Arrange the bearing shells (1) on the main bearing housings.

TRALIS

AT/AD

188

F3A ENGINE

Base - January 2003

60559

47581

47579

Figure 152

Figure 153

Figure 154

Mount the crankcase base and using a torque wrench (2),
tighten the outside hex grooved screws (1) to a torque of
30 Nm following the sequence shown on page 190.

Using a torque wrench (3), tighten the inside screws (1) to a
torque of 120 Nm. Then tighten them to an angle of 90

° and

° with tool 99395216 (4) with another two phases.

Regrind the outside screws (1, Figure 153) with closure to an
angle of 60

° using tool 99395213 (4).

Mount the crankcase base (1) using appropriate tackle and
hooks.

189

TRALIS

AT/AD

F3A ENGINE

Content .. 48 49 50 51 ..

Iveco Stralis AT/AD. Manual - part 50