4-4
FUEL
When this choke valve is closed,
a very
rich fuel mixture
is drawn into the engine.
The throat
of the carburetor
is usually
referred
to as
the
"barrel."
Carburetors
installed
on engines
covered
in this manual
all have a single metering
jet with a single
throttle
and
choke
plate.
Single
barrel
carbu retors
are fed by one float
and cham-
ber.
4- 3 FUEL
SYSTEM
The fuel system
includes
the fuel tank,
fuel pump, fuel filters,
carburetor,
connect-
ing
lines,
with
a
squeeze
bulb,
and
the
associated
parts
to connect
it all together.
Regular
maintenance
of the fuel system
to
obtain maximum
performance,
is
limited
to
changing
the fuel filter
at regular
intervals
and using
FRESH
fuel.
Even with the high
price
of
fuel,
removing
gasoline
that
has
been standing
unused over a long period
of
time
is still the easiest
and least
expensive
preventive
maintenance
possible.
In
most
cases
this
old gas,
even
with
some oil mixed with
it,
can be used without
harmful effects
in an automobile
using regu-
lar gasoline.
If a sudden increase
in gas consumption
is noticed,
or if the engine does not perform
Commercial
additives,
such as Sta-bii,
may be used
to
keep the fuel
in the
tank
fresh.
Under
favorable
conditions,
such additives.
will
prevent
the fuel
from
"souring" for
up to
twelve
months.
Damaged
piston,
possibly
caused by insufficient
oil
mixed
with
the fuel;
using
too-low
an octane
fuel;
or
using fuel
that
had "soured"
(stood
too long without
a
preservative
additive).
properly,
a carburetor
overhaul,
including
boil-out,
or
replacement
of the fuel
pump
may be required.
4-4
TROUBLESHOOTING
The following
paragraphs
provide
an or-
derly sequence
of tests
to pinpoint problems
in the
system.
If an engine
has not been
used for some time and fuel has remained
in
the
carburetor,
it
is possible
that
varnish
may have formed.
Such a condition
could
be the
cause
of hard starting,
or complete
failure of the engine to operate.
Fuel Problems
Many
times
fuel
system
troubles
are
caused
by a plugged fuel filter,
a defective
Fuel
connector
with
the O-ring
visible.
These 0-
rings have a relative
short
life
and must
be
replaced
at
regular
intervals,
as detailed
in the text.
Содержание 4906B 4HP 1969
Страница 5: ......
Страница 85: ...3 44 POWERHEAD EXHAUST COVER I LEVER Exploded drawing of a 5 5 hp powerhead 1956 60 principle parts identified...
Страница 87: ...3 46 POWERHEAD Exploded drawing of a 7 5 hp powerhead 1956 58 with principle parts identified...
Страница 88: ...CYLINDER BLOCK 3 47 HEAD GASKET RING...
Страница 89: ...3 48 POWERHEAD HEAD BYPASS COVER Exploded drawing of a 10 hp powerhead 1956 63 with principle parts identified...
Страница 90: ...CYLINDER BLOCK 3 49 THERMOSTAT EXHAUST COVER The...
Страница 137: ...4 46 FUEL LEVER AND LOW SPEED...
Страница 153: ...4 62 FUEL Exploded view of a pressure tyoe fuel tank with major parts identified...
Страница 157: ...4 66 fUEL...
Страница 177: ...5 18 IGNITION FLYWHEEL Exploded drawing of a typical magneto system Only one coil and set of points is shown...
Страница 271: ...8 12 LOWER UNIT PROPELLER Exploded drawing of the Weedless lower unit gear case with major parts identified...
Страница 285: ...8 26 LOWER UNIT Exploded drawing of a lower unit with a window for access to the shift connector...
Страница 412: ...A 16 APPENDIX Wire Identification 33 hp with Generator 1965 67...
Страница 413: ...APPENDIX A 17 o C...
Страница 414: ...Wire Identification 33 hp with Generator 1969 70...
Страница 415: ...APPENDIX A 19 Wire Identification 35 hp 1957 59...
Страница 416: ...A 20 APPENDIX Wire Identification 40 hp Standard Shift with Generator 1960 66...
Страница 417: ...APPENDIX A 21 UJ cc b Wire Identification 40 hp Standard Shift with Generator 1967 68...
Страница 418: ...A 22 APPENDIX ee I U Vl Z Z o U I I Wire Identification 40 hp Standard Shift With Generator 1969 10...
Страница 419: ...APPENDIX Wire Identification 40 hp Electric Shift with Generator 1961 66 A 23...
Страница 420: ...A 24 APPENDIX C 00 Wire Identification 40 hp Electric Shift with Generator 1967 68...
Страница 421: ...Wire Identification 40 hp Electric Shift with Generator 1969 70...
Страница 422: ...NOTES NUMBERS...