Engines Iveco C87 / Cursor 87. Manual — part 30
Install the connecting rod caps (1) with half-bearings; tighten
the connecting rod cap fixing screws (2) to 50 Nm (5 kgm)
torque. By tool 99395216 (3), tighten the screws further at
90
° angle.
Remove the caps and check the clearance by comparing the
width of the calibrated wire with the scale calibration on the
envelope containing the wire.
540610
CYLINDER HEAD
Before dismounting cylinder head, check cylinder head for
hydraulic seal by proper tooling; in case of leaks not caused
by cup plugs or threaded plugs, replace cylinder head.
115886
47583
36159
Figure 62
Figure 63
Figure 64
Install and fix tool 99360264 (2) with bracket (4); tighten by
lever (1) until cotters are removed (3); remove the tool (2)
and the upper plate (5), the spring (6) and the lower plate (7).
Repeat the operation on all the valves.
Turn the cylinder head upside down and remove the valves
(8).
The planarity (1) is checked using a ruler (2) and a thikness
gauge (3). If deformations exist, surface the head using proper
surface grinder; the maximum amount of material to be
removed is 0.2 mm.
To check the clearance proceed as follows:
connect the connecting rods to the relative main journals,
place a length of calibrated wire on the latter.
α
Checking the planarity of the head on the
cylinder block
(Demonstration)
After leveling, make sure that valve sinking and
injector protrusion are as described in the relative
paragraph.
540831
Checking assembly clearance of big
end pins
In case of plugs dismounting/replacement, on
mounting, apply sealant Loctite 270 on plugs.
NOTE
Dismounting the valves
Before dismounting cylinder head valves, number
them in view of their remounting in the position
observed on dismounting should they not have to
be overhauled or replaced.
Intake valves are different form exhaust valves in
that they have a notch placed at valve head centre.
NOTE
NOTE
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
35
F2C CURSOR ENGINES
MAIN DATA - VALVES AND VALVE GUIDES
* Values to be obtained after installing the valve guides
92841
47509
Figure 65
Figure 66
Check, by means of a micrometer, that valve stem diameters
are as specified; if necessary, grind the valves seat with a
grinder, removing the minimum quantity of material.
INSTALLATION DIAGRAM FOR VALVE GUIDES AND VALVES
* Values to be obtained after installing the guide valves
540667
VALVE GUIDES
*
Figure 67
48625
540622
VALVE
Removing deposits and checking the valves
Remove carbon deposits using the metal brush supplied.
Check that the valves show no signs of seizure or cracking.
Check the diameter of the valve stem using a micrometer
(see Figure 66) and replace if necessary.
36
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
41032
115887
Figure 68
Figure 69
Remove valve guides by means of tool 99360288.
Install by means of tool 99360288 equipped with part
99360294, which determines the exact installation position
of valve guides into the cylinder heads; if they are not
available, install the valve guides in the cylinder head so that
they project out by mm 16.3 to 16.7 (Figure 66).
After installing the valve guides, smooth their holes with
sleeker 99390310.
Ream the valve seats (2) on cylinder head using tool (1).
After reaming the valve seats, use tool 99370415, to make
sure that the valve position, with respect to the cylinder head
surface, is the following:
- -0.5 to -0.8 mm (recessing) of exhaust valves;
- -1.6 to 1.9 mm (recessing) of discharge valves.
To replace the injector case (2), act as follows:
- thread the case (2) with tool 99390804 (1).
Carry out operations described in the following figs. by
fixing tools to the cylinder head by means of braket A.
Replacing of valve guides
Replacing - Reaming the valve seats
To replace the valve seats, remove them using the
appropriate tool.
Valve seats must be reamed whenever valves or
valve guides are replaced or ground.
NOTE
540613
REPLACING INJECTOR HOLDER
CASES
Removal
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
37
F2C CURSOR ENGINES
45633
Figure 70
Figure 71
Figure 72
- Remove any residue (1), with tool 99390772 (2), from
the cylinder head groove.
1
2
- fasten extractor 99342149 (2) to case (3), by tightening
the nut (1), and pull out the case from cylinder head.
115888
115889
- Lubricate sealing rings (3) and fit them to the case (4);
fix tool 99360554 (2) to the cylinder head by means of
bracket A, install the new case, tighten the screw (1),
upsetting the case lower part.
115890
Figure 73
- Adjust the casing hole (3) with borer 99394043 (1) and
guide bushing 99394045 (2).
38
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F2C CURSOR ENGINES
Base - June 2007
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