Checking The Cylinder Head; Installing The Valves - MOTO GUZZI BELLAGIO Service Station Manual

BELLAGIO
VALVE AND GUIDES COUPLING DATA
CHART (OUTLET)
Specification
Valve guide inside diameter
mm (in)
Valve stem diameter mm (in)
Fitting clearance mm (in)

Checking the cylinder head

Check that:
•
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.
Desc./Quantity
8.005 ÷ 8.022 (0.3152 ÷
0.3158)
7.965 ÷ 7.980 (0.3136 ÷
0.3142)
0.025 ÷ 0.057 (0.0010 ÷
0.0022)
Engine
ENG - 117