5-4-8
BREATHER VALVE
Attach breather plate (breather valve) and breather cover to crankcase using
proper
gaskets.
Replace gaskets with new ones
if
they
are torn or damaged.
Replace breather hose at least once a year
or
when ever a crack was found.
W
5-4-9
CYLINDER HEAD
(1)
Clean carbon and gum deposits from the valves, seats, ports and guides. Inspect the valves, valve
(2)
Replace valves that are badly burned, pitted or warped.
(3)
When installing the valves in the cylinder head,
oil
the valve stems and insert them into the valve guide.
(4)
Valve guides should be replaced when the valve stem clearance exceeds specifications
(See
seats and valve guides.
Then place the cylinder head on
a
flat table, install the washer, valve spring and spring retainer.
"SERVICE
DATA").
Draw the valve guides out and press the new guides in.
Refer to"SERV1CE
DATA"for
clearance specifications.
After replacing the valves and guides, lap valves
in
place until
a
uniform ring
shows
around the face
of
the valve. Clean valves and wash cylinder head thoroughly.
Tighten five flange bolts evenly
in
three steps by the following tightening torque:
Cylinder head
M8
X
65
mm flange bolt
.----
4
pcs.
(EH12,
17)
(5)
Install cylinder head
to
cylinder with new head gasket.
M10
X
75
mm flange bolt
....
4
pcs.
(EH25)
I
Tightening torque
(EH12,
EH17
type)
I
I
Tightening torque
(EH25
type)
I
~~~ ~ ~~~
1
st
step
2nd
step
50 kgcm
7.2
ft*lb
3.6
fblb
10
Nom
5
Nom
100
kgcm
I
1st step
I
2nd
step
I
final
step
I
5-4-10
ROCKER ARMS AND PUSH RODS
(1)
Insert push rods into crankcase.
(2)
Apply
oil
to the
rocker
arms and assemble them to the cylinder head
using
the
rocker
shaft
and
spacer.
Put push rod tip in the hollow
of
tappet top.
5-4-11
VALVE CLEARANCE ADJUSTMENT
(1)
Position the piston at
the
top dead center
of
the compression stroke.
The
top dead center may be
obtained by placing the key
slot
on
the power take
of€
shaft to
:
I
12
o'clock
I
EH
I2B,
I7B,
25D
!
I
_I
i
1.-
(J
I
10
o'clock
EH25B
EH
I2D,
17D
Fig.
5-37
-
37
-
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