4-26
FUEL
not necessary.
If the choke is to be assem-
bled without rebuilding the carburetor,
pro-
ceed directly
to Section 4-8. If the carbure-
tor is to be rebuilt
at this time,
proceed to
Section 4-7.
WATER CHOKE -
REMOVAL
An understanding
of
exactly
how the
water choke functions
is essential
to ensure
the
service
procedures
are
properly
per-
formed.
Hot
water
from
the
engine
is
allowed to circulate
inside a chamber of the
choke.
As the hot water
heats the spring,
the metal
expands
and the
spring releaves
its tension
on the choke.
Once the tension
is released, the choke opens.
The hot
circulating
water
is routed
to
the port side of the engine and is discharged
into
the
exhaust
chamber.
An additional
feature
is included
in the automatic
choke
assembly.
A spring-loaded
diaphragm
and
plunger assembly, activated
by intake mani-
fold pressure,
closes
the choke the instant
the engine is shut down, whether
the engine
is hot or cold.
The plunger will release
its
hold on the
choke only when the engine is
again
started.
At low manifold
pressure,
with
the
engine
operating,
the
choke
is
released
to open the choke and the thermal
(water)
system
is in control.
This
system
opera tes independently
of the water
choke
system.
,
A check valve and orifice
is installed
in
the water system
to prevent flooding of the
diaphragm when the manifold pressure
fluc-
tuates
during slow speed operation.
A punc-
ture, or other damage, to the diaphragm
will
cause
the
choke
to
be held in the
closed
position at all times,
when the vacuum sys-
tem is in the automatic
position.
However,
the choke can still be opened by using the
manual lever.
During
installation
of
the
carburetor,
considerable
attention
must be exercised
to
install
the
proper
hose to the correct
fit-
ting.
If the hoses are crossed, water will be
discharged
into the intake
manifold and the
engine,
resulting
in a series
of horrendous
problems.
This water will then be released
from
the
cylinder
through
the
spark
plug
openings when the spark plugs are removed
and the
engine
is cranked
in an effort
to
start
it.
THEREFORE,
take
time to identify
the
hoses to ensure each is correctly
connected
to the proper carburetor
fitting.
1-
Remove
the
hoses connected
to the
choke, one from the top, and the other two
from the
bottom.
The hose connected
to
the bottom
of the choke and closest
to the
carburetor
is the
water
outlet
line.
The
other hose on the bottom is the vacuum line.
The hose connected
to the top of the choke
is the water inlet line.
Disconnect
the fuel
line
at
the
carburetor.
Remove
the
two
nuts securing
the carburetor
to the intake
manifold, and then remove the carburetor.
HARKS
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...