Iveco Stralis AT/AD. Manual — part 48
MAIN DATA OF VALVES AND VALVE GUIDES
* Measurement to be made after driving in the valve guides
Check with a micrometer that the diameter of the valve
stems is as indicated. If necessary, grind the valve seats with
a grinding machine, removing as little material as possible.
Figure 116
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Valve seats
Regrinding — replacing valve seats
!
The valve seats are reground whenever the valves or
valve guides are ground and replaced.
41032
Check the valve seats (2). If you find any slight scoring or
burns, regrind them with tool 99305019 (1) according to the
angles shown in Figure 116 and Figure 118. If it is necessary
to replace them, using the same tool and taking care not to
affect the cylinder head, remove as much material as possible
from the valve seats so that, with a punch, it is possible to
extract them from the cylinder head.
Heat the cylinder head to 80 — 100
°C and, using a drift, fit in
the new valve seats (2), chilled beforehand in liquid nitrogen.
Using tool 99305019 (1), regrind the valve seats according
to the angles shown in Figure 118.
After regrinding the valve seats, using tool 99370415 and dial
gauge 99395603, check that the position of the valves in
relation to the plane of the cylinder head is:
-
-0.65 to -0.95 mm (recessing) intake valves;
-
-1.8 to -2.1 mm (recessing) exhaust valves.
Figure 117
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Figure 118
MAIN DATA OF VALVE SEATS
1. Intake valve seat — 2. Exhaust valve seat
1
2
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Base - January 2003
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To replace the injector case (2), proceed as follows:
- Thread the case (2) with tool 99390804 (1).
The steps described in Figs. 120 — 123 — 124 — 125 need to
be carried out by fixing the tools, with the bracket A, to the
cylinder head.
Checking clearance between valve-stem and
associated valve guide
Using a dial gauge with a magnetic base, check the clearance
between the valve stem and the associated guide. If the
clearance is too great, change the valve and, if necessary, the
valve guide.
The valve guides are removed with the drift 99360481.
They are fitted with the drift 99360481 equipped with part
99360295.
Part 99360295 determines the exact position of assembly of
the valve guides in the cylinder head. If they are not available,
you need to drive the valve guides into the cylinder head so
they protrude by 30.8-31.2 mm.
After driving in the valve guides, rebore their holes with the
smoother 99390311.
540667
Valve guides
Replacing valve guides
73538
* Measurement to be made after driving in the valve guides
Figure 119
Figure 120
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Replacing injector cases
Removal
179
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F3A ENGINE
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- Using the tool 99390772 (2) remove any residues (1) left
in the groove of the cylinder head.
- Screw the extractor 99342149 (2) into the case (3).
Screw down the nut (1) and take the case out of the
cylinder head.
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- Lubricate the seals (3) and fit them on the case (4). Using
tool 99365056 (2) secured to the cylinder head with
bracket A, drive in the new case, screwing down the
screw (1) upsetting the bottom portion of the case.
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- Using the reamer 99394041 (1-2), rebore the hole in the
case (3).
Figure 121
Figure 122
Figure 123
Figure 124
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F3A ENGINE
Base - January 2003
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47585
Check injector protrusion (2) with the dial gauge (1).
The protrusion must be 1.14 to 1.4 mm.
Checking injector protrusion
71720
INJECTOR CASE ASSEMBLY DIAGRAM
Figure 125
- Using grinder 99394041 (1-2), ream the injector seat in
the case (3), check the injector protrusion from the
cylinder head plane which must be 1.14 to 1.4 mm.
Figure 126
Figure 127
181
S
TRALIS
AT/AD
F3A ENGINE
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