54-9
CYLINDER HEAD
I
Remove carbon from the cylinder head, particularly
its
combustion chamber, and make clean the cooling
fins.
Also
check
the head
for
distortion.
NOTE:
Replace the cylinder head gasket with
a
new one.
NOTE:
DlSTlNGTlON between the GASKET of EY15, EY20and EY28
I
The pitch
of
the holes
for
the bolts fastening cylinder head and the outer circumference dimensions
of
the
gasket
for EY15 and EY20 are same. However, the inner dimensions are different each other. The gasket for EY15
has
a
red mark while the gasket for EY20 has
a
green mark.
For EY28, refer to Fig.
43.
Red
mark
Green
mark
EY28
-
Fig.
43
NOTE:
Cylinder head tightening torque:
190
-
230 kg-cm
NOTE:
DISCRIMINATION of CYLINDER HEAD
As stated above, the pitch
of
the holes of cylinder
Embossed
mark
head
is
common to both EY15 and EYZO. For en-
abling
to
discriminate the cylinder head
of
EY15
from that of EY20, an embossed mark 15
is
given
to the former, while no embossed mark
is
given to
the
latter.
For EY28, an embossed mark "EY28"
is
given on
the combustion chamber side of the cylinder head.
Fig.
44
NOTE:
Meantime, embossed mark for-
EY15 Kerosene engine
is
15K. and
EY20 Kerosene engine is 20K.
5-4-10
SPARK PLUG
Tightening torque of the spark plug:
EYl5, EY20
...........
120
-
150
kg-cm
EY28
...............
230
-
250
kg-cm
5-4-1
1 IGNITION
COIL,
FLYWHEEL and STARTER PULLEY
1)
Temporarily fasten the ignition
coil
to
the crankcase, and install the flywheel
to
the crankshaft. Starting pulley
is
fast-
ened together with the flywheel.
NOTE:
Before installing, wipe out oil from the crankshaft and the tapered portion of the flywheel.
NOTE:
Flywheel tightening torque:
600
-
650
kg-cm
-
35
-
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