Guide Valve Installation - MV Agusta BRUTALE 910 S Workshop Manual

Guide valve installation

Assemble an oversized valve guide as follows:
B
Oil the external valve guide surface.
Slowly and evenly heat the cylinder head up to 150°.
If necessary cool the valve guides with (N2) nitrogen
liquid; or dry ice.
Insert the valve guide using the special n° 8000A2385
tampon up to the stroke and let rest until the tempera-
ture has stabilized.
Check to be sure the valve slides freely in the valve
guide otherwise coat it with a 4,5 H7 reamer or broach
N° 8000A2625.
Valve
The stem diameters must not fall below:
4,485 mm inlet
-3/100
4,475 mm exhaust
-3/100
The width of the sealing surfaces should fall in the
range 0.7 - 1.2 mm (see figure).
Check to be sure that the stem and the surface in con-
tact with the valve slots are in good condition. No
traces of pitting, cracking, deformations or traces of
wear should appear. Verify that the stem is perfectly
rectilinear.
Engine
Plane α α (coinciding
axial valves exhaust)
- 40 -
Plane β β (coinciding axial
valves inlet)