Engines Iveco C10,C13, Cursor 10, Cursor 13. Manual — part 67
Check the torsion of the connecting rod (5) by comparing
two points (A and B) of the pin (3) on the horizontal plane
of the axis of the connecting rod.
Position the mount (1) of the dial gauge (2) so that this
pre-loads by approx. 0.5 mm on the pin (3) at point A and
zero the dial gauge (2). Shift the spindle (4) with the
connecting rod (5) and compare any deviation on the
opposite side B of the pin (3): the difference between A and
B must be no greater than 0.08 mm.
Check the bending of the connecting rod (5) by comparing
two points C and D of the pin (3) on the vertical plane of the
axis of the connecting rod.
Position the vertical mount (1) of the dial gauge (2) so that
this rests on the pin (3) at point C.
Swing the connecting rod backwards and forwards seeking
the highest position of the pin and in this condition zero the
dial gauge (2).
Shift the spindle (4) with the connecting rod (5) and repeat
the check on the highest point on the opposite side D of the
pin (3). The difference between point C and point D must be
no greater than 0.08 mm.
61696
Checking axis alignment
Check the parallelism of the rod axes (1) by using a suitable
device (5) and operating as follows:
- Fit the connecting rod (1) on the spindle of the tool (5)
and lock it with the screw (4).
- Set the spindle (3) on the V-prisms, resting the
connecting rod (1) on the stop bar (2).
Figure 62
Figure 63
Figure 64
Figure 65
To fit the piston rings (1) on the piston (2) use the pliers
99360184 (3).
The rings need to be mounted with the word ”TOP” (4)
facing upwards. Direct the ring openings so they are
staggered 120
° apart.
Mounting the connecting rod - piston assembly
Carry out the steps for removal described on pages 28 and
29 in reverse order.
The connecting rod screws can be reused as long
as the diameter of the thread is not less than 13.4
mm.
Mounting the piston rings
Checking torsion
61694
Checking bending
61695
49029
Checking connecting rod alignment
(Demonstration)
(Demonstration)
(Demonstration)
NOTE
32
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F3B CURSOR ENGINES
Base - May 2007
49030
47593
Figure 66
Figure 67
Figure 68
Fit the half-bearings (1), selected as described on pages 22 to
23, both on the connecting rod and on the stand.
- all pistons belong to the same class, A or B;
- ideogram stamped on the piston crown is placed toward
the engine flywheel, or the cavity, on the piston cover,
corresponds to the position of the oil spray nozzles.
61831
Connecting rod-piston assembly
Marking area on the piston crown of ideogram
specifying the assembly position and the
selection class
Connecting rod marking area (see Figure 60).
1
2
3
Fit the connecting rod-piston assemblies (1) into the piston
liners (2) using band 99360605 (1, Figure 68). Check the
following:
- the openings of the split rings are offset by 120
°;
As spares, class A pistons are provided and can be
fitted also to cylinder barrels belonging to class B.
Piston protrusion check
Once assembly is complete, check piston protrusion from
cylinder barrels: it must be 0.12-0.42 mm.
Fitting the connecting rod-piston assembly
into the piston liners
NOTE
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
33
F3B CURSOR ENGINES
CYLINDER HEAD
Before taking down the cylinder head, check the seal using
the appropriate tool; in case of leakage replace the cylinder
head.
47594
47583
36159
48625
Figure 69
Figure 70
Figure 71
Valve removal
Install and fix tool 99360263 (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.
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 73) and replace if necessary.
Checking assembly clearance of big end pins
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.
NOTE
Mount the connecting rod caps (1) together with the bearing
shells. Tighten the screws (2) fixing the connecting rod caps
to a torque of 60 Nm (6 kgm). Using tool 99395216 (3),
further tighten the screws with an angle of 60
°.
Remove the caps and determine the clearance by comparing
the width of the calibrated wire with the graduated scale on
the case containing the calibrated wire.
Definitive assembly: check the diameter of screw threading
(2) it must not be less than 13.4mm along the entire length,
otherwise the screw is to be replaced; lubricate the pins and
bearings of the connecting rod; tighten the screws (2) as
described above.
Screw threading (2) must be lubricated with engine
oil before assembly.
NOTE
Figure 72
34
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
F3B CURSOR ENGINES
Base - May 2007
MAIN DATA - VALVES AND VALVE GUIDES
* Values to be obtained after installing the valve guides
71718
Figure 73
Figure 74
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
Valve guides
101508
INTAKE
EXHAUST
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
35
F3B CURSOR ENGINES
Valves
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