Engine Iveco Vector 8. Manual — part 36
The tolerances allowed on the engine shaft pins are:
- ovality = 0.007 mm
- taper 0.012 mm
- main journal misalignment 0.10 mm
- crankpin misalignment
± 0.025 mm
- tolerance on the distances between the axis of the
crankshaft and the outside of each crankpin
± 0.10 mm
Figure 23
Figure 24
Figure 25
Detail of couplings of central main journal.
Detail of couplings of crankpin.
Detail of couplings of rear — thrust main journal.
Checking main journal alignment
LIMIT POSITION
LIMIT POSITION
NORMAL POSITION
MAIN JOURNAL
CRANKPIN
Diagram for checking the flywheel mating surface is orthogonal
and coaxial with the axis of rotation and main journals.
Turn the shaft:
- with the dial gauge at B no change greater than 0.04 mm
must be measured on the dial gauge;
- with the dial gauge at A no change greater than 0.03 mm
must be measured.
Figure 26
Figure 27
Figure 28
B
A
0.025
0.025
83496
8296
83495
83494
8297
83493
18
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
VECTOR 8 ENGINES
Base - April 2006
Print P2D32V001E
Figure 29
Figure 30
Replacing water pump drive gear
Check that with a pressure of 15 bar (15 kg/cm2) there is no leakage from the plugs (1).
The counterweights (2) must be fitted with the crankshaft fitted in the cylinder assembly. The numbering marked on the counter-
weights must correspond to that marked on the cranks of the crankshaft.
The bolts fixing the counterweights to the crankshaft must be lubricated with ”UTDM” oil and tightened to the prescribed torque
(pre—torque 40 Nm, torque 90
° check window 110—170 Nm) when the counterweights are parallel to the main bearing housings.
Crankshaft balancing instructions
The crankshaft must be dynamically balanced.
Maximum permissible unbalance for each of the two planes
of balancing: 1000 g mm.
- Check that the toothing of the gear (2) is neither damaged
nor worn; if it is, then extract it with an appropriate
extractor. The gear (2) must be mounted on the
crankshaft (1) when there is a difference in temperature
between them of 200
°C.
- Check that under a load of 32000 N the gear (2) does not
shift in relation to the shaft.
82236
82237
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
19
VECTOR 8 ENGINES
Print P2D32V001E
Base - April 2006
Figure 31
Changing the oil pump and timing system gear
Figure 32
- Check that the gear toothing (2) is neither damaged nor
worn. If it is, remove the gear by unscrewing the screw (3)
and using an extractor.
Take out the split pin (4).
The gear (2) must be fitted on the crankshaft (1) by
bringing the gear into alignment with the threaded seat
and with the housing of the split pin on the crankshaft.
Using the right drift, bring the gear flush onto the
crankshaft and screw down the M8x1.25x80 mm screw,
tightening it to a torque of 22 to 27 Nm.
Fitting the main bearings
The crankshaft must be dynamically balanced.
Arrange the main bearing shells with the lubrication hole in
their respective seats and fit the crankshaft (3) with the tool
99360500 (2) and suitable hoist (1).
82270
NOTE
20
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
VECTOR 8 ENGINES
Base - April 2006
Print P2D32V001E
Figure 33
Figure 34
α
Finding journal clearance
Check the clearance between the crankshaft main journals and
their respective bearings as follows:
- thoroughly clean the pins;
- apply a calibrated wire (2) on the main journals (1);
- fit the caps (1) of the main bearing housings with the half
bearings so that the stamped numbers face the same side
as the corresponding ones on the cylinder assembly;
- Lubricate under the bottom side of the heads of screws
(2 and 3) that fix the bench caps with engine oil and
tighten to the fixing torque prescribed;
When tightening to an angle, use tool 99395216.
Figure 35
Tightening sequence
Figure 36
M20x1.5 bolts
Type of tightening: pre-torque + angle
Pre-torque
160Nm
Angle
240˚
Guard-torque
600 ÷ 1000 Nm
M16x1.5 bolts
Type of tightening: pre-torque + angle
Pre-torque
~70Nm
Angle
120˚
Guard-torque
240 ÷ 460 Nm
16813
89797
89796
16886
NOTE
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS
21
VECTOR 8 ENGINES
Print P2D32V001E
Base - April 2006
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