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18
3.
ENGINE
fig.
3.
14
Breather
CD
Cy linder head
cave
r
A assembly
(2)
Breather pip
e
Fig. 3. 15
Removing
the
com cha
in
CD
Cam chain
®
Cam chain cotter
Fig.
3.
16
Hook
wires
on the
chain
and
hook
them
on the
outside of the cylinder
CD
Cam cha
in
®
Wire
The
breather
is
installed on the intake cylinder
head
cover
on
model
w
ith
engine
serial
No. prior
to
CB 450 E-3000542,
CL 450 E-1002569.
On
engine serial
No.
CB
450-3000543,
CL 450 E-
l
002570
and subsequent, the breather
is on the
exhaust cylinder
head
cover. Inside the crankcase
the
pressu
re
constantly
nuctuates
due
to
the
recipr
ocat
ing
motion
of
the
piston.
The
oil
be.
comes
con
taminated and
det
eriora
tes
due to
tr.e
gas generated
by
the
rise in
temperature.
Blow-'.:,y
from
the
combustion
chamber
causes a
pressure
build-up
w
ithin
the crankcase.
In
order to prevent
the undesirable cond itions,
the
breather separates
the oil with
in
the labyr inth
and
exhausts the gas
to
the outside.
Simultaneously, the breather
works
as
an
oi
l
coo ler.
It
also
prevents the entry of
humidily
in.the
atmosphere from entering the
engine.
(Refer to
Fig.
3.
14)
B.
Disassembly
l.
Remove
both
the
intake and
exhaust
cylinder
head covers.
2.
Disconnect
the
cam
chain
at' the
joint by
using
a
cam chain cutter.
(Fig.
3.
1 5)
NOTE:
a.
The
side plate of the cam
chain joint
is lighter
in color
than
the
rest of
the
chain.
b.
It
is
easier to disconnE'.ct
the
c
hain
from the
intake side.
c.
The
crankshaft
can be
turned
easily by remov-
ing the spark plugs.
d. Be careful not to drop the cam chain
joint
in
the
engine.
e. Hoo
k
wires on
both ends
of
the
chain so that
it does
not
drop into the crankcase
.
(Refer
to
Fig. 3. 161
4.
Remo
ve
the
eig
ht
cylinder head
retaining l
0
mm hex and
cap
nuts.
NOTE:
It is recommended that
the
nuts
be
loosened
in
the
reverse of
the tightening
sequence.
(Refer
to Fig. 3. 191
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