MV Agusta 2008 F4 312RR 1078, Workshop Manual

Page: 60 / 124

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Cylinder kit
C
Piston-cylinder coupling
The cylinder-piston groups are furnished already cou-
pled; if there should be an exchange of cylinders and
pistons between them it would be necessary to pro-
ceed surveying coupling plays.
Measure the diameter of the (ND) pipe at 20 mm
from the superior plane
, as indicated on the sketch.
The piston diameter must be measured at 8 mm
from the shell base
, in a perpendicular position to the
piston pin axle.
These measurements must be carried out at a stabili-
zed temperature of 20°.
The play between piston and cylinder must fall bet-
ween 0,038 e 0,067 mm .
Maximum wear limit permitted 0,10 mm.
Piston pin revision
Verify that the piston pins show no lines or bluish
colours which indicate overheating.
Piston-pin coupling
The (S) play between piston pins and piston must
be of 0,004÷0,012 mm in case the limit is exceeded it
is necessary to substitute the piston pin and piston.
The limited wear permitted is
0,03 mm .