2
104
E
N
G
IN
E ASS
E
M
B
LY AN
D CO
NTRO
LS
Cam zone to be checked.
Cam height measurement.
CHECKING CAMSHAFTS
Verify the zones
A
and
B
on the camshafts
making sure they have no traces of meshing
or abnormal wear. Make sure the sides of
the teeth
C
are not chipped or have no trace
of abnormal wear.
The zone
A
comes into contact with the
cylinder head becoming part of a hydrody-
namic support bearing. Zone
B
on the other
hand supports the roller bearing.
Make sure that the shafts in the cam zones
are free of abnormal colouring which is typi-
cal when working without oil.
Use a thickness gauge to check the wear li-
mit of the cams referring to the values carri-
ed in the table.
Sometimes the cams show small run marks.
This can be accepted, if the finger followers
are without wear and the cam height is insi-
de the tolerance.
Check on the exhaust camshaft that the
spring
1
of the centrifugal decompressor re-
calls the rest of the device so that the cylin-
der segment
D
of the rod
2
protrudes com-
pletely without any play.
Turn the lever
3
all the way to make sure the
device is not jammed.
2
.17
.6
A
B
C
1
3
D
2
Intake
Exhaust
Displacement
[cm³]
Nominal size
[mm]
Size limit
[mm]
Nominal size
[mm]
Size limit
[mm]
350
34,1
34,0
33,75
33,65
400
34,1
34,0
33,75
33,65
450
33,75
33,65
33,75
33,65
498
33,75
33,65
33,75
33,65
