Carburetor Cleaning And Inspection - Ford LSG 875 Service Manual

3-15
FUEL SYSTEM
3-15
MODEL 2300 2-V CARBURETOR (Continued)
CLEANING AND INSPECTION
CARBURETORS
WARNING: DO NOT SMOKE, CARRY LIGHT-
ED TOBACCO OR OPEN FLAME OF ANY
TYPE WHEN WORKING ON OR NEAR ANY
FUEL RELATED COMPONENT. HIGHLY
FLAMMABLE MIXTURES ARE ALWAYS PRE-
SENT AND MAY BE IGNITED, RESULTING IN
POSSIBLE HUMAN INJURY.
Dirt, gum, water or carbon contamination in
the carburetor or the exterior moving parts of the
carburetor are often responsible for unsatisfacto-
ry performance. For this reason, efficient car-
buretion depends upon careful cleaning and
inspection.
The cleaning and inspection of only those
parts not included in the carburetor overhaul re-
pair kit are covered here. All gaskets and parts
included in the repair kit should be installed
when the carburetor is assembled and the old
gaskets and parts should be discarded.
Wash all parts in clean commercial carburetor
cleaning solvent, except all electrical compo-
nents, the rubber or solid nitrophyl carburetor
float (if so equipped), the accelerator pump di-
aphragm and the power valve. If a commercial
solvent is not available, denatured alcohol may
be used.
Rinse the parts in kerosene to remove all
traces of the cleaning solvent, and then dry them
with compressed air. Wipe all parts that can not
be immersed in solvent with a clean, soft, dry
cloth. Be sure all dirt, gum, carbon and other for-
eign matter are removed from all parts.
Check the metal float(s) (if so equipped) for
leaks by holding it under water that has been
heated to just below the boiling point. Bubbles
will appear if there is a leak. If float leaks, re-
place it. Replace the float if the arm needle con-
tact point is grooved. If the float(s) is
serviceable, polish the needle contact surface of
the arm with crocus cloth or steel wool. Replace
the float shaft(s) if it is worn.
Force compressed air through all passages of
the carburetor. Do not use a wire brush to
clean any parts, or a drill or wire to clean out
any openings or passages in the carburetor.
A drill or wire may enlarge the hole or passage,
changing the calibration of the carburetor.
Check the choke shaft for grooves, wear, and
excessive looseness or binding. Inspect the
choke plate for nicked edges and for ease of op-
eration. Free the shaft and plate, if necessary.
Check the throttle shaft(s) in its bore for bind-
ing, or excessive looseness. Check the throttle
plate(s) for burrs which prevent proper closure.
Inspect the main body, throttle body and
metering block, accelerating pump cover, and
the secondary diaphragm housing (Holley 4-V
carburetor) for cracks.
Replace all screws and nuts that have
stripped threads. Replace all distorted or broken
springs.
Inspect all gasket mating surfaces for nicks
and burrs. Repair or replace any parts that have
a damaged gasket surface.
Inspect the main and accelerating pump dis-
charge nozzles and idle restrictions. If any of the
openings are blocked, open them with com-
pressed air.
Always replace fuel filter (external) when in-
stalling the carburetor.