32619
128140
16552
18857
41104
Figure 36
Figure 37
Figure 38
Figure 39
Figure 40
Measurement of the piston pin diameter (1) throughout a
micrometer (2).
Conditions for the correct coupling of pins and
pistons
Lubricate the pin (1) and its seat on piston hubs with engine
oil; th e pin shall be fitted into the piston with a slight finger
pressure and shall not be withdrawn by gravity.
Check the thickness of the grommets (2) throughout a
micrometer (1).
Check the slack between the grommets (3) of the 2nd and
3rd slots and relevant housing on the piston (2) u sin g calliper
and gauges (1).
SCHEME FOR THE MEASUREMENT OF SLACK
BETWEEN THE FIRST PISTON SLOT AND THE
TRAPEZOIDAL GROMMET
Due to the particular for of the first grommet, having
trapezoidal section, the slack between said grommet and the
slot must be measured as follows: t h e piston (1) must be
projected from the crankcase so that nearly half of the
grommet (2) in question comes out of the cylinder barrel (3).
In this position, using a gauge calliper, measure the slack (X)
between grommet and slot: the slack must comply with the
prescribed value.
Piston pins
Split rings
SECTION 4 - MECHANICAL OVERHAUL
21
F32 SERIES
Pri nt P2D32F005 E Base - April 2009
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