Engine Iveco C10/C13/C78/Cursor 13/Cursor 78. Manual — part 106
60593
FRONT SIDE
stage 4:
angle
inner
screws
(55º)
60592
60594
Figure 48
stage 1:
pretightening
outer screws
(30 Nm)
FRONT SIDE
FRONT SIDE
FRONT SIDE
stage 2:
pretightenig
inner screws
(120 Nm)
stage 5:
angle
outer
screws
(60º)
FRONT SIDE
stage 3:
angle
inner
screws
(60º)
60593
60593
DIAGRAM SHOWING THE UNDERBLOCK FIXING SCREWS TIGHTENING ORDER
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
29
Make sure the piston does show any trace of seizing, scoring,
cracking; replace as necessary.
60608
60607
Figure 49
Figure 50
PISTON CONNECTING ROD ASSEMBLY
1. Connecting rod body - 2. Half bearings - 3. Connecting rod cap - 4. Cap fastening screws - 5. Split ring -
6. Scraper ring with spiral spring - 7. Bevel cut sealing ring - 8. Trapezoidal sealing ring - 9. Piston pin - 10. Piston.
Removal of the piston split rings (2) using the pliers 99360184
(1).
Removal
Pistons are equipped with three elastic rings: a sealing ring, a
trapezoidal ring and a scraper ring.
Pistons are grouped into classes A and B for diameter.
49024
Figure 51
Remove the piston pin split rings (2) using the round tipped
pliers (1).
PISTON CONNECTING ROD ASSEMBLY
30
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
1
2
49025
32618
49026
Figure 52
Figure 53
Figure 54
Figure 55
Remove the piston pin (1).
If removal is difficult use the appropriate beater.
Measuring the diameter of the pistons
Measuring the gudgeon pin diameter (1) with a micrometer (2).
Conditions for correct gudgeon pin-piston
coupling
Lubricate the pin (1) and the relevant housing on the piston
hubs with engine oil; piston must be inserted with a slight
finger pressure and it should not come out by gravity.
71714
Using a micrometer (2), measure the diameter of the piston
(1) to determine the assembly clearance; the diameter has to
be measured at the value X shown:
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
31
16552
3513
Figure 56
Figure 57
Check the thickness of the piston ring (2) with a micrometer
(1).
The seal (2) of the 1st slot has a V shape. The clearance ”X”
between the seal and its seat is measured by setting the
piston (1) with the ring in the cylinder liner (3) so that the
seal comes half out of the cylinder liner.
Piston rings
60610
Check the clearance between the seals (2) and their seats on
the piston (1) with a feeler gauge (3).
36134
Using a feeler gauge (2), check the opening between the ends
of the seals (1) inserted in the cylinder liner (3).
If you find the distance between the ends is less than or
greater than as required, replace the piston rings.
Figure 58
Figure 59
Figure 60
106242
MAIN DATA OF THE PISTON, PISTON RINGS AND PIN
* MAHLE MONDIAL piston - ** FEDERAL MOGUL piston
F Dimension detected on 130 mm
∅. -
J measured at 2.5 mm from outer
∅ - X = 0,8±0,1
32
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
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