REG. CODE
1-5302-528
MODEL N°
50805
DATE OF ISSUE
31.07.2001
REVISION
00
DATE
31.07.2001
ENDORSED
COMPILER TECO/ATL
22
DISASSEMBLY/REASSEMBLY
VIII
VALVE SPRINGS
Check the general conditions of the valve springs, replacing them if they
are damaged or their original characteristics are compromised.
Check that the lengths under load corresponds to the values indicated
in fig.
lf these values are not achieved, change the spring.
TAPPETS
Check the general conditions, if the side surfaces of the cylinders are
scored, replace the tappets
BREATHER VALVE
Clean any deposits that have formed on the valve and check the valve
movement, replace the rubber gasket if damaged.
It is forbidden to lap the inner surface of the cylinder with emery
cloth.
CYLINDER
Using a dial gauge, check two internal diameters (a-b) perpendicular
each ather at three different heights (fig.17). lf the taper (c-d) and
ovalization (a-b) exceed the limit of 0.06 mm, the cylinder has to be
rebored.
The oversizes are shown on page 36 . lf the cylinder is rebored, observe
a machining allowance of: +0.020 + 0
lf the taper (c-d) and ovalization (a-b) do not exceed the 0.06 mm limit,
and the cylinder shows no sign of scoring, simply replace the rings. In
this case, in order to facilitate rapid accommodation between the ring
and the cylinder , reset the correct roughness of the liner on all of the
contact surface with the ring, using the plateau method.
Do not true the inside surface of the cyIinder by hand using emery cloth.
lf there is a slight step in the cylinder in zone A (fig.18), eliminate the
difference using a lapping stone, in order to avoid ring damage.
On completion, wash abundantly with petrol or diesel fuel.
18
15
16
17
