Valves-Valve Guides Coupling Data; Inspection And Overhaul Of Valve Seats In Cylinder Heads - MOTO GUZZI V-7 700 Operating Handbook

VALVES-VALVE GUIDES COUPLING DATA
Valve guide
I.D.
Inlel va lve
8.000
+
8.022
mm.
Exhaust valve
{.3149 - .3158" }
INSPECTION AND OVERHAUL OF VALVE
SEATS IN CYLINDER HEADS
In order to obtain a perfect match with valves,
valve seats must be regrinded. Angles of inclina-
tion of the seats are as follows:
inlet valve: 60
0
25'
- exhaust valve: 45°25'
38
38.6
38.4
7.987
7.972
Valve slem
Clearances
diameter
7.972 +
7.987
rnm.
0.013 -+ 0.050
mm.
(.3138 - .3144") (.0005 - .0019")
7.965
-+
7.980
mm. 0.020
~
0.057
mm.
(.3136 - .3142") (.0008 - .0022")
Regrinding is carried out by means of a milling
cutter, guided by a stem inserted in valve guide.
After milling, in order to obtain a perfect match ,
it is necessary to grind the valve in its seat with
emery paste. Should valve seats be so deterio-
rated that normal milling will not be sufficient ,
replacement of same will then be required .
Fig. 20
7.980
7965
8 .000
.022
14.064
14.075
34.6
34.4
34
17