A = Selection class
∅ 125 — 125.013 mm
B = Selection class
∅ 125.011 — 125.024 mm
X = Selection class marking area
In case of maximum wear >0.150 mm or maximum
ovalization >0.100 mm compared to the values indicated in
the figure, the liners must be replaced as they cannot be
ground, lapped or trued.
REPAIR OPERATIONS
CYLINDER BLOCK
Checks and measurements
Internal diameter of the cylinder liners is checked for
ovalization, taper and wear, using a bore dial (1) centesimal
gauge 99395687 (2) previously reset to ring gauge (3),
diameter 125 mm.
If a 125 mm ring gauge is not available use a
micrometer caliper.
A = Ø 142.000 to 142.025 mm
B = Ø 140.000 to 140.025 mm
C = Ø 141.961 to 141.986 mm
D = Ø 139.890 to 139.915 mm
The figure shows the outer diameters of the cylinder liners
and the relative seat inner diameters.
The cylinder liners can be extracted and installed several
times in different seats, if necessary.
Check the state of the cylinder assembly machining plugs: if
they are rusty or there is any doubt at all about their seal,
change them.
34994
60595
60597
Figure 6
Figure 7
Figure 8
Figure 9
1 = 1
st
measuring
2 = 2
nd
measuring
3 = 3
rd
measuring
Carry out measurings on each cylinder liner at three different
levels and on two (A-B) surfaces, to one another
perpendicular, as shown in Figure 7.
(Demonstration)
Cylinder liners are equipped with spare parts with
“A“ selection class.
60596
x
NOTE
NOTE
14
SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS