the
)ores
t to
;sure
tare
its
ld
is
reas-
:sket
il."
:ant
in-
lUst
1
is
:ing
r so
lad.
leI.
md
res.
p
Stem seal
Valve guide
Valve stem seal
So
that
no
lube oil will find its way
into
the
cylinder
head
through
the
sliding clearance
between valve stem and guide, a valve
stem
seal
is
fitted
to
the
guide.
Rocker arms,
shaft
and stays
The
arms are a special cast
iron
in material;
each arm
is
casehardened by gas carburization.
A lube oil hole
is
drilled in
the
top
part
of
the
arm.
The rocker shaft
is
fabricated from carbon-
steel pipe stock; its hollow serves
as
oil passage.
Those parts
of
the
shaft
on
which
rocker
arms
are
mounted
are induction-hardened.
There are
three
shaft stays
made
of
an
aluminum alloy by casting.
The
stay
on
the
rear
side has an internal oilway drilled in
such
a way
as
to
convey
the
lube oil coming from
the
cylinder head.
The
stay for
the
rear side is also
usable for
the
front
side.
Crankcase ventilation system
This system refers to the arrangemen
t designed
to
feed back
the
blowby gas (occurring in the
crankcase)
to
the
air
breather
pipe, so
that
the
gas
(which
is
high in combustible
content)
will
be drawn
into
the
air inlet side and
then
into
the
cylinders.
The
space inside crankcase is
communicated
to
the
space inside
the
rocker
cover
through
the
tappets and the space
around
the
pushrods.
ENGINE
Air breather pipe Rocker cover
111;----
Tappet
Crankcase ventilation system
2-5
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