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discharged harmlessly over the side.
Connection
from
the tank to
the
engine
should be made with
copper
tubing of a size recommended by the
engine manufacturer. A short sect ion
of
flexible line should
be placed
in the line at the point of attach-
ment
to the
fuel pump
to prevent
leaks
occurring due to
fatigue of
the metal tubing.
9.
ELECTRICAL SYSTEM
The importance of adequate and safe
wir ing aboard a boat cannot be over-
emphasized. All connections must be
clean,
tight,
and free
from oil.
'There solder connections are neces-
sary, the connection should be made
mechanically secure before soldering
Use only
rosin flux when soldering
to
prevent corrosion.
All
wiring
should be kept as short as possible
to
mInImIze
voltage
drop in
the
circuits.
A battery
box should
be built
as
close
to the
engine as
possible,
securely fastened
to the
boat and
of a size
to prevent
shifting
of
the battery.
Any cover
on the box
should
be
readily
removable
for
periodic
checking of
water
level
in the battery (See Fig.
10).
All wiring
should be
run in
such
a fashion as to
prevent mechanical
injury.
Wires
for
all
circuits
should be of a large enough size to
minimize
voltage
drop in the cir-
cuit and of sufficient current car-
rying capacity to prevent overheat-
ing. (See Table
J)
10.
FINISHING THE JOB
The
instrument
panel
may be
in-
stalled at any convenient
location
at the
control station.
Oil pres-
sure and
water temperature
gauges
should be
connected in
accordance
~ith
the
instructions
that
come
with the unit.
Gear shifting can be
accomplished
by using the shifting lever supplied
with most engines or one of several
types of
controls available. These
controls
may
be
operated
from a
remote lever,
either
mechanically
through a system of rods or hydrau-
lically through piping.
With the engine installed, the pro-
peller
is
then
fastened
to
the
shaft, care being taken to maintain
proper clearances
from the
bottom
of the boat and the rudder.
After the
engine is
installed and
all
connections completed,
the en-
gine should be
enclosed in
an en-
gine box.
In designing
this
box,
keep in
mind the possibility
that
it may be necessary to make adjust-
ments or repairs in the
future.
A
box
with removable
top and
sides
is desirable.
It must
also be
kept in mind that
an internal
combustion engine uses
roughly 14 parts of air to one part
of gasoline when operating.
There-
fore, sufficient
ventilation
must
be provided to allow
it to operate
at full efficiency.
This will vary
with the
size of
the engine;
the
higher
the horsepower the
greater
must be the ventilating area.
Five
square inches of
ventilating
area
is sufficient for engines
up to 25
H.P.
and
15
square inches
for' en-
gines up to
150
H.P.
After complet ion of the installat ion
and with the boat in the water, the
alignment
of
the
engine
to
the
propeller
shaft should be
checked
once more.
The engine may then be
started and all connections checked
for
signs of leaks.
Oil
pressure
and water temperature gauges should
be closely watched for signs of im-
proper operation. After making sure
that everything is operating properl
the boat should be taken on a short
run at slow speed.
Final
checking
and adjusting
is done on this trip
and the boat is now ready for opera-
tion.
-12-
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