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2.2.2
Reassembly of the head – valve units
Do not invert the springs on the suction valve
units with those on the exhaust valve units as in
some models these are not interchangeable.
Pay particular attention to the conditions of the
various components and replace them if necessary,
and at the intervals indicated in the "PREVENTIVE
MAINTENANCE" table in chapter 11 of the Use and
maintenance manual.
At every valve inspection, replace all O-rings and
all anti-extrusion rings both in the valve units
and on the valve plugs.
Before repositioning the valve units, thoroughly
clean and dry the relative seats in the head as shown
in Fig. 18.
To reassemble the various components, perform the
operations listed above in reverse order to par. 2.2.1.
To facilitate insertion of the valve guide in its housing, you can
use a bush resting on the horizontal guide planes and use a
hammer acting on the whole circumference (Fig. 19/a).
Fig. 17
Fig. 17/a
Insert the suction and outlet valve units,
checking that they are fully inserted in the head
seat.
Then apply the valve covers and calibrate the
respective M10x25 screws with a torque wrench
at the specified torque.
Fig. 18
20
Fig. 19
Fig. 19/a
Fig. 19/b
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