12.
INSTALLATION
Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend on the way
in whch the engine
is
installed. Carefully observe the following instructions for installing the engine.
12-1 INSTALLING
When mouhting the engine, carefully examine its position, the method
of
connecting it to
a
load (machine), the foundation,
and the method of supporting the engine.
When determining its mounting position, in particular, make sure that gasoline and oil can easily be supplied andchecked, the
spark plug and breaker can easily be checked, the
air
cleaner can easily be serviced, and that the oil can easily be discharged.
12-2 VENT1 LATlON
Fresh
air
is necessary for coohg the engine and burning the fuel.
In cases where the engine is operated under a hood
or
in
a
small room, temperature rise
in
the engine room can cause vapor
lock,
oil
deterioration, increased
oil
consumption,lossaof power, piston seizure, shorter engine life, etc., making
it
impossible
to operate the engme properly, It is necessary, therefore, to provide a duct
or
baffle to guide cooling
air
to the engine to
prevent recirculation
of
the hot air used for engme cooling, and temperature rise of the load (machme).
Take steps as necessary to keep the engine room temperature below
50°C
even in the hottest period
of
the year.
12-3 EXHAUST GAS DISCHARGE
Exhaust gas is noxious. When operating the engine indoors, be sure to discharge the exhaust gas
outdoors.
If
a long exhaust
pipe
is
used in such
a
case, the internal resistance increases causing loss of engine power.
Thus
pipe inside diameter must in-
crease
in
proportion
to
exhaust pipe length.
Exhaust pipe:
Less
than
3
m long, pipe inside diameter
25
rnm,
Less
than
5
m long, pipe inside diameter
30 mm.
12-4 POWER TRANSMISSION
to
DRIVEN MACHINES
12-4-1
BELT
DRIVE
Take the following notes into consideration.
*
V-belts are preferable to flat belts.
*
The driving shaft
of
the engine must be parallel to the driven shaft
of
the load.
*
The driving pulley of the engine must be in line with the driven pulley of the load.
*
Install the engine pulley as close to the engine as possible.
*
If
possib!e, span the belt horizontally.
*
Disengage the load when starting the engine.
If
no clutch
is
used, use
a
belt tension pulley
or
the like.
12-4-2
FLEXIBLE
COUPLING
When using a flexible coupling, runout and misalignment between the driven shaft and engine shaft must be minimized.
Runout and misalignment tolerance are specified by the couphg manufacturer.
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