Top and
oil
rings are chromiur:n.plated
in
sliding surfaces, while the other, namely,
2nd. are tapered, install these taper
rings
with marks "UP" on
cut
ends up.
To
oil
ring
is
attached a spring type expander to provide high and uniform contact
pressure. The ends
of
spring are butted
to
each other with a short steel wire between
them.
Arrangement
of
piston ring
cut
ends
is
indicated
in
Fig. 5·9.
b"
Direction
of CAM
SHAFT
e<"
"oS-
,
--,
"
,
"
~'O")'
"-
.~~
..
'
J,.~
(Direction
of
piston
pin)
III _
..
_"--~
"J-
'~
"~~
Direction
of
~
c.
_~."
COMBUSTION CHAMBER
JET
v<"
$.
..,,<""
"04-
Fig.
5-9 Arrangement
of
piston ring
cut
ends
4 CYLINDERS
4-1
Oversize
In
Model
40050
Engine, cylinders, being cast
in
one body with crankcase, have dry
liners.
When
they have got worn more than
O.2mm
in
bore
or
cut
deeply
in
lines, machine
them
to
a suitable oversize. Oversize pistons and piston rings are available in three sizes:
+0.25, +0.50 and +0.15.
4-2 Cylinder liners
If
oversize parts are not available or when they
have
got worn over
the
limit of use
(+1.20mm), change cylinder sleeve. For detaiis,
ask
your dealer or a service shop.
5
BEARING
METALS
5-1
General cautions
Handle metals on main bearings and connecting rods always with good care not
to
scratch
or
otherwise damage their bearing surfaces.
In
assembling them, clean bearing
surfaces and coat them with oil; then
clamp them down, making sure
that
they are free
from any strain.
-
73-
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