Engines Iveco C10,C13, Cursor 10, Cursor 13. Manual — part 30
60593
FRONT SIDE
stage 4:
angle
inner
screws
(45º)
60592
60594
Figure 47
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
(90º)
60593
60593
DIAGRAM OF TIGHTENING SEQUENCE OF CRANKCASE BASE FIXING SCREWS
27
CURSOR ENGINES F3A
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
Base - May 2007
Make sure the piston does show any trace of seizing, scoring,
cracking; replace as necessary.
60608
60607
Figure 48
Figure 49
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 50
Remove the piston pin split rings (2) using the round tipped
pliers (1).
Piston connecting rod assembly
28
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
CURSOR ENGINES F3A
Base - May 2007
49025
32618
49026
Figure 51
Figure 52
Figure 53
Figure 54
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.
47584
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 shown.
1
2
29
CURSOR ENGINES F3A
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
Base - May 2007
MAIN DATA OF THE PISTON, PISTON RINGS AND PIN
16552
3513
Figure 55
Figure 56
Check the thickness of the piston ring (2) using a micrometer
(1).
The sealing ring (2) of the 1st cavity is trapezoidal. Clearance
“X” between the sealing ring and its housing is measured by
placing the piston (1) with its ring in the cylinder barrel (3),
so that the sealing ring is half-projected out of the cylinder
barrel.
Piston rings
116811
60610
Check the clearance between the sealing rings (2) and the
relative piston housings (1) using a thikness gauge (3).
36134
Check the opening between the ends of the sealing rings (1),
using a thickness gauge (2), entered in the cylinder barrel (3).
If the distance between ends is lower or higher than the value
required, replace split rings.
Figure 57
Figure 58
Figure 59
30
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
CURSOR ENGINES F3A
Base - May 2007
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