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MF9_UK
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5.5.2 CHECK PISTON
The following procedure must also be applied to all the other
pistons.
Check eventual breaks on the piston.
Use a micrometer, as shown in the figure, to check that the
value (P) enters within the specific value.
CLASS
A
B
WARNING:
In the case of changing one or more pistons:
The piston is distinguished by a letter that indicates
the class it belongs to.
The cylinder-piston coupling must be carried out
among the same classes that they belong to.
NOTE:
The maximum play of the piston is of 0.1 mm.
Change the piston if necessary.
5.5.3 CHECK SEGMENTS
The following procedure must be applied to all the segments.
Check the absence of scuffing and traces of shrinkage on every
segment.
Check that the edge of the section is well defined and free in
the housings.
Whenever wear in the segments is found, change the pistons
as well.
UK
P
ø 87.950 ÷ 87.960
ø 87.961 ÷ 87.971
139
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