The measurements must be made for each single cylinder at
three different heights up the liner and on two planes at right
angles to each other: one parallel to the longitudinal axis of
the engine (B) and the perpendicular (A); the greatest wear
is generally found on this last plane with the first
measurement.
On finding ovalization, taper or wear, go ahead and
bore/grind and finish the face of the cylinder liners. The
refacing of the cylinder liners should be done in relation to
the diameter of the pistons supplied as spare parts oversized
by 0.4 mm of the nominal value and to the prescribed
assembly clearance.
18837
87781
Figure 118
Figure 119
Once the engine removal is complete, carefully clean the
cylinder block. For the cylinder block transportation use the
suitable rings.
Carefully check that the crankcase has no cracks in it.
Check the state of the plugs. If they are rusty or there is any
doubt about their seal, replace them. When fitting the caps
into place, apply Loctite 270 sealant (IVECO NO. 93162429)
to the same. Examine the surfaces of the cylinder liners; they
must show no sign of meshing, scoring, ovalization, taper or
excessive wear. The inside diameter of the cylinder liners is
checked, to ascertain the extent of ovalization, taper and
wear, using the bore meter 99395687 (1) fitted with a dial
gauge previously reset on the ring gauge of the diameter of
the cylinder liner or on a micrometer.
CYLINDER BLOCK
Checks and measurements
Figure 120
* Surface roughness parameters:
R1 =
4
÷ 10 μm
Rz
=
3
÷ 8 μm
Ra
=
0,3
÷ 0,6 μm
W1 <
2
μm
Permissible surface porosity for machined cylinder
(see Figure 121)
ZONE B1 = Area of greatest mechanical stress,
segment/liner
contact:
No.2
non-continuous
porosities
are
permissible max. 0.5x0.5.
ZONE B2 = Surface involved in segment rubbing:
No.2 non-contiguous porosities are
permissible max. 1x0.8.
C
C
100%
100%
87782
Figure 121
87783
232
F1C ENGINE
D
AILY
E
URO
4