Iveco EuroCargo (12 to 26 t). Manual

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

performed

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

URO

ARGO

ECTOR

12-26 t

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

URO

ARGO

ECTOR

12-26 t

ENGINE F4 AE 0481

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

URO

ARGO

ECTOR

12-26 t

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

URO

ARGO

ECTOR

12-26 t

ENGINE F4 AE 0481

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

⊝

Content .. 13 14 15 16 ..

Iveco EuroCargo (12 to 26 t). Manual - part 15