Iveco EuroCargo (12 to 26 t). Manual — part 15
70171
70172
85484
Figure 50
Figure 51
Figure 52
Check the camshaft (2) support pin diameter by means of a
micrometer (1) on two perpendicular surfaces.
The camshaft bushes (2) must result forced in their relevant
seats.
The inner surfaces must result without seizing and wearing
traces.
By means of a bore meter (3), measure the diameter of the
rear and front bushes (2) and intermediate seats (1) for
camshaft.
The
measurements
must
be
performed
on
two
perpendicular axes.
541213
BUSHES
MAIN DATA OF THE CAMSHAFT BUSHES AND RELEVANT SEATS
* Dimensions to be obtained after the bush driving
541211
Cam lift check and pin alignment
check
Position the shaft on counterpoints and, by means of a
centesimal gauge, located on the central support, check that
the alignment error is not higher than 0.04 mm: on the
contrary, replace the shaft. Then, check the cam lifting: it must
result of 6.045 mm for the exhaust ones and of 7.582 mm for
the suction ones; if you detect different values, replace the
shaft.
sec. A-A
E
URO
C
ARGO
T
ECTOR
12-26 t
50
ENGINE F4 AE 0481
Base - February 2003
70174
70175
70176
70164
70238
Figure 53
To replace front and rear bushes (1), use for their removal
and refitting the tool 99360362 (2) and handgrip 99370006
(3).
MAIN DATA CONCERNING THE TAPPETS AND THE
RELEVANT HOUSINGS ON THE ENGINE BLOCK
Lubricate the tappets (1) and fit them into the relevant
housings on the engine block.
Lubricate the camshaft bushes and fit the camshaft (1) taking
care not to damage the bushes or the housings.
Set camshaft (3) retaining plate (1) with the slot facing the
top of the engine block and the marking facing the operator,
then tighten the screws (2) to the specified torque.
541213
Bush replacement
Fitting tappets — camshaft
!
When refitting bushes (1) direct them so that
lubrication holes coincide with engine block housing
holes.
541224
Tappets
Figure 54
Figure 55
Figure 56
Figure 57
E
URO
C
ARGO
T
ECTOR
12-26 t
ENGINE F4 AE 0481
51
Base - February 2003
70179
70180
70182
70181
Figure 58
Figure 59
Figure 60
Figure 61
Check camshaft end float (1).
It shall be 0.23
± 0.13 mm.
Fit nozzles (2) and tighten the fastening screws (1) to the
specified torque.
Grind journals and crankpins if seizing, scoring or excessive
ovalisation are found. Before grinding the pins (2) measure
them with a micrometer (1) to decide the final diameter to
which the pins are to be ground.
!
It is recommended to insert the found values in the
proper table.
See Figure 61.
Undersize classes are: 0.250 — 0.500 mm
!
Journals and crankpins shall always be ground to the
same undersize class.
Journals and crankpins undersize shall be marked on
the side of the crank arm No.1.
For undersized crankpins: letter M
For undersized journals: letter B
For undersized crankpins and journals: letters MB
FILL THIS TABLE WITH OUTPUT SHAFT JOURNAL AND CRANKPIN MEASURED VALUES
*Rated value
E
URO
C
ARGO
T
ECTOR
12-26 t
52
ENGINE F4 AE 0481
Base - February 2003
OUTPUT SHAFT
540810
Measuring journals and crankpins
70183
Figure 62
OUTPUT SHAFT MAIN TOLERANCES
70237
MAIN BEARING ON TIMING
SYSTEM CONTROL SIDE
INTERMEDIATE MAIN
BEARINGS
FIRST MAIN BEARING ON
FRONT SIDE
measured on > 45.5 mm radius
between adjacent journals
E
URO
C
ARGO
T
ECTOR
12-26 t
ENGINE F4 AE 0481
53
Base - February 2003
TOLERANCE CHARACTERISTIC
GRAPHIC SYMBOL
SHAPE
Roundness
○
SHAPE
Cilindricity
/
○/
Parallelism
//
DIRECTION
Verticality
Straightness
POSITION
Concentricity or coaxiality
Circular oscillation
OSCILLATION
Total oscillation
Taper
LEVELS OF IMPORTANCE FOR PRODUCT CHARACTERISTICS
GRAPHIC SYMBOL
CRITICAL
IMPORTANT
⊕
SECONDARY
⊝
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