Installing The Valves - MOTO GUZZI GRISO 850 2007 Service Station Manual

Engine
•
The planes of contact with the cover and with the cylinder are not scored or damaged so as
to compromise a perfect seal.
•
Check that the clearance between the valve guide holes and valve stanchions is within the
prescribed limits.
•
Check the status of the valve seats.
The valve seats should be reamed with a mill. The
seat inclination angle is 45° +/- 5'. After milling, it
is necessary to grind them to ensure a good cou-
pling and a perfect sealing between the ring nuts
and the valve heads.

Installing the valves

NOTE
THE FOLLOWING OPERATIONS REFER TO REMOVING ONLY ONE HEAD BUT APPLY TO BOTH
HEADS.
•
Place the valve (6) inside the head.
•
Place the lower retainer (5) and the
shimming washers.
•
Place the external spring (4).
•
Place the internal spring (3).
•
Insert the upper retainer (2).
•
Place the two cotters (1) on the seats
on the valves.
•
Compressing the spring with the spe-
cial valve tool, install the valve cotters.
Specific tooling
ENG - 112
GRISO 850