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 As can readily be seen the float system
Wash fuel strainer assembly in
4.
gasoline and clean screen with air
under the most favorable of operating
under pressure.
conditions is subjected to a certain
If the screen, or
the threads on the strainer are not
amount of wear. Under severe
in good condition, install a new
conditions that result in excessive
assembly. When reinstalling fuel
vibrations being transmitted to the
strainer assembly always use a new
carburetor, float valve and float valve
strainer gasket if a gasket is used
seat wear is accelerated.
to obtain a seal.
It should be an established policy that
It has been proven, with few
whenever the carburetor is disassembled
exceptions, that with a float
for whatever cause the service man make
system in good order, carburetor
following checks:
flooding only occurs when dirt or
foreign matter becomes lodged
Examine float valve for any signs
1.
between the float valve (3) and the
of wear. If it is not absolutely
float valve seat (4).
t r u e o r i s g r o o v e d a n d h a s n `t a
perfect taper, a new float valve
and also a new float valve seat
b. THE IDLE SYSTEM:
must be used. These float valves
and seats are supplied in matched
The idle system controls the flow of
sets and are tested at the factory
fuel at idle speed and at slow speeds
for leaks. Always use a new float
until the throttle is opened wide enough
valve seat gasket to make sure of a
to allow the power fuel feed system to
perfect seal.
function,
Examine float for any signs of
2.
When the throttle valve (6) is in the
failure.
To
test
metal
float,
idle position the edge of the valve is
submerge float in pan of hot water
between the primary idle orifice (7)
and if air bubbles are observed,
and the secondary idle orifice (8).
replace with new float.
With the valve in this position the air
pressure (manifold vacuum) at the
Examine cork float for bare places
primary idle orifice (7) is lower than
or cracks in coating. If either
the air pressure in the fuel bowl
are found, o r i f f l o a t s h o w s
chamber (9) and fuel is forced from the
evidence of having been soggy,
fuel bowl (1) into the idle fuel
replace with new one.
As the fuel travels
passage (10).
attempt to recover f (do not
through the idle fuel passage (10) it
shellac or varnish.)
passes through the metering orifice of
Set float height to the proper
the idle jet (11) to the point where it
3.
specification for the particular
is combined with air entering through
model carburetor being serviced.
the idle adjusting needle seat (12).
Make certain that the entire
The mixing of air with gasoline helps
assembly works free and that there
to atomize the fuel and this process is
is no binding.
repeated at the secondary idle or if ice
(8) as the fuel travels through the
idle fuel passage (10).
1-12
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