5.
INSTALLATION
The life,
ease
of
maintenance, frequency of
check
and repair, and operating
cost
are
greatly
affected by
the
way
the
engine is installed. When installing the engine, therefore, the following
contents must
be
studied carefully.
n
5-1
INSTALLING
When
installing the engine,
its
position, coupling conditions with the operating machine and
anchoring
or
supporting method must
be
carefully studied.
Especially, when deciding the installing position, consideration must
be
given
to
facilitate
its
routines such
as
filing and checking
of
gasoline
and
oil,
checking of spark plug and breaker,
maintenance of
air
cleaner and oil draining.
5-2
VENTILATION
The
engine must
be
supplied with fresh air
for
cooling and fuel combustion. When
the
engine
is
to
be
operated in
a
cover
or
in
a
small room,
a
proper means must
be
provided for cooling
air
re-circulation
or
ducts and baffle plates
for
guiding
a
cooling
air,
because if the temperature in
the engine compartment
is
allowed
to
rise, vapor lock, oil deterioration, increase of
oil
consumption, power reduction, seizure,
loss
of
engine life
or
other troubles
are
caused, and
proper
operation
is
harmed. The temperature
of
the engine compartment must
be
maintained
below
50OC
even in summer with necessary ventilation arrangement.
5-3
EXHAUST GAS EVACUATION
Since
the
exhaust
gas
from
the
engine is toxic, when
the
engine
is
operated indoors,
the
exhaust
gas
must
be
evacuated
to
outside. Since the output power
of
an engine
is
considerably
influenced
by
the
length
of
the
exhaust duct, its diameter must
be
increased in proportion
to
its
F-,
length.
5-4
FUEL SYSTEM
When
the
standard fuel tank is installed separate from
the
engine, it must
be
so
located
that
its
bottom surface lies within
the
height
of
5
CL
50
cm from
the
fuel joint of the carburetor.
When
the
fuel tank is installed too low, fuel is not fed properly and if it is positioned
too
high,
the
carburetor overflow
is
caused.
When connecting
the
fuel pipe,
to
eliminate air lock and vapor
lock,
the
piping must
be
carefully examined for heat conductivity, diameter, bending, and
leakage
through fittings. The
standard I.D. of the fuel pipe is
4
‘L
5
mm.
5-5
POWER
TRANSMISSION
to
DRIVEN
MACHINES
5-5-1
BELT
DRIVE
Take
the
following notes into condition:-
o
V-belts
are preferred to
flat
belts.
o
The
driving shaft
of
the
engine and
the
driven
shaft
of
the
driven machine must
be
parallel.
o
The
driving pulley of
the
engine and
the
driven pulley of
the
driven machine must be aligned
o
The driving pulley must
be
mounted
as
near
the
engine
as
possible.
o
As
far
as
possible,
the
belt
is spanned horizontally.
o
When starting
the
engine,
the
load must
be
disconnected from
the
engine.
o
If
a
clutch is
not
available,
a
tension pulley
or
other
means must
be
employed.
correctly.
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14
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