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a)
Whenever
the cylinder is
to
be disassembled and re-assembled, the cylinder mounting packing must also be re-
placed. Tighten the
four cylinder
mounting
screws to 3.1
-
3.7 kg-m (22.4
-
26.8 ft.-Ibl.
b)
The
cylinder
head is made
of
an
aluminum alloy casting, designed to have good cooling characteristics. The
combustion chamber is shaped specially
so
that knocking is minimized and high output power is obtained.
When-
ever the cylinder head
is
disassembled, remove carbon deposit from
the
inside.
Tighten
the six tightening
screws
to
2.3
-
2.7 kg-m
(16.6
-
19.5
ft-Ib).
3-
4.
Piston and Piston Ring
The pistons
are
machined from
aluminium-silicon alloy stocks,
possessing high heat
resistivity and very
low
coefficient
of heat
expansion.
In
order
to prevent the
split ends of
the
piston rings to interfere
with the
suction, exhaust and
scavenging
holes opening inside the
cylinder bore, the
piston rings
are retained
in the
piston
ring
grooves
in
the
proper
position by means
of two
locating pins. When
exchanging a piston, assemble the
new
piston
in the
correct
relative
position
as shown in Fig.
2.
Ex
hau
st port
locating pin
,.---
-..
........
/'
"
locating pin
Drive
shaft side
- -
~
Fanside
"F" mark
(stands
for
front)
Figure 2
When the
engine
has been in operation for
a
long period of
time, carbon
will be depositing
on
the
top of
the
pistons.
To
provide a good
sealing
fit for the cylinder, so
that
the high
pressure gas
is not lost, two rectangle
section piston
rings,
made
of special
alloycast iron,
are
used. These
piston
rings
sometimes get stuck
in
the piston
ring
grooves. This deposit
should
be removed whenever the pistons
are
disassembled.
3-5.
Starting Device
The
EC series engines are started
by means of
a recoil starter,
which is
fixed to
the fan
cover.
As
an emergency starter,
if the recoil starter is out of order, the
engine can also
be
started by a
rope,
after
removing the recoil-starter main body.
The recoil starter
pu~ley
has been
specially
designed for this purpose.
3-
6.
Carburetor
and
Fuel Pump
The
.
fuel pump
and the carburetor,
by means of which
correct amount of fuel
is
fed
into the
engine regardless of
its
pOSition, are important
auxiliary
units.
These units
are
most susceptible to
any
foreign particles in the
fuel, even a
very
small amount can
be
a cause for a
valve
sticking,
as a result of which fuel
supply
to the
engine may be
hindered.
Exercise greatest care in
filling the fuel
tank.
3-
7.
When mounting
an
ignition
coil
on the
snowmobile,
make
certain the
ground is
complete
from the ignition
coil
base to the
engine.
4.
Operation
4-1.
Fuel
to be used.
Mixed fuel
consisting
of
20 part gasoline and
1
part 2 cycle lubrication oil.
29
)
J
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