Benelli Tornado Tre Novicento 903, Workshop Manual, Page: 130 / 336

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L I M I T E D E D I T I O N
5.3.3 CHECK VALVE SEATS
The following procedure must be applied to all the valve seats.
Eliminate eventual carbon deposits.
Apply the (Dykem) Workshop (b) tincture of bluing onto the
face of the valve.
Install the valve in the cylinder head.
Press the valve through the valve guide and on the valve seat
to leave a clear trace.
NOTE:
It will be necessary to remove the bluing at the point
at which the seat and the face of the valve touch.
NOTE:
If the trace is not partial or not uniform, carry out a
smoothing operation on the face and the seat of the
valve.
Smooth:
• the face of the valve
• the seat of the valve
NOTE:
After having changed the cylinder head or the valve
and the relative guide, it will be necessary to smooth
the seat and face of the valve.
Apply a coarse grained paste (a) for smoothing on the face of
the valve.
WARNING:
Do not allow the smoothing paste to enter into the
space between the stem of the valve and the guide.