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5-4-8
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.
Then place the cylinder head
on
a flat
table,
install the valve springs, spring retainers
and
collet
valves.
(4)
Valve guides should be replaced when the valve stem clearance exceeds specifications (See
"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 four flange bolts evenly in three steps by the following tightening torque:
Cylinder head
M8
X
65
mm flange bolt
-
-
4
PCS.
(EH12-2, 17-2)
seats and valve guides.
(5)
Install cylinder head to cylinder with new head gasket.
M10
X
75
mm
flange bolt
-
4
pcs.
(EH25-2)
Tightening torque
(EH12-2,
17-2)
1
st
step final step
2nd step
5
Nom
100
kgcm
50
kgwn
23-26
Nm
10
Nom
17-30
ft-lb
7.2
ft-lb
3.6
ft-lb
230-270
kgcm
Tightening torque
(EH25-2)
1
st
step
final
step
2nd step
9.8
Nom
100
kgecrn
33.3-41.2
Nom
19.6
Nom
24.6-30.4
ft*lb
14.5
ft4b
7.2
ft-lb
340-420
kg-cm
200
kgcm
n
54-9
ROCKER
ARMS
AND
PUSH
RODS
(1)
Insert push rods into crankcase.
Put push rod tip in the hollow
of
tappet top.
(2)
Apply oil to the rocker arms and assemble them to the cylinder head using pivot bolt and guide plate.
5-4-10
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
off
shaft
to
:
I
12
o'clock
I
10 o'clock
I
EH12-2B,17-2B,25-2D
I
EH12-2D,17-2D,25-2B
-
38
-