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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
CLEANING AND INSPECTION
CLEANING
Dirt, gum, water or carbon contamina-
tion in the carburetor or the exterior
moving parts of the carburetor are often
responsible for unsatisfactory perform-
ance. For this reason efficient carbure-
tion depends upon careful cleaning and
inspection.
The cleaning and inspection of only
those parts not included in the carbure-
tor overhaul repair kit are covered here.
All gaskets and parts included in the
repair kit should be installed when the
carburetor is assembled and the old gas-
kets and parts should be discarded.
1. Soak all parts except throttle body
bushings, dashpot, throttle modula-
tor or governor solenoid in a stand-
ard carburetor cleaner. If a commer-
cial solvent is not available, lac-
quer thinner or denatured alcohol may
be used. Do not lower parts into sed-
iment which settles to bottom of
cleaning tank. Agitate parts while
in solution to insure a thorough
cleaning. After the parts have been
sufficiently soaked, rinse them in
hot water to remove all traces of
the cleaning solution. Scrub away
remaining foreign matter with a stiff
brush (not wire) while rinsing parts
and castings.
2. Dry all parts with compressed air.
Also direct compressed air through
jets, nozzles and passages in cast-
ings.
3. Always discard diaphragms. Reuse of
old diaphragms may cause unsatisfac-
tory carburetor performance.
4. Carburetor jets and passages should
never be cleaned with a drill, wire
or similar object. This method of
cleaning will distort jets and pas-
sages. A buffing wheel, wire brush,
file or other sharp instrument should
not be used to remove carbon depos-
its, since these tools might also
remove the protective plating on the
carburetor parts. Parts such as "0"
rings, gaskets, diaphragms and seals
should never be exposed to solvent
because of its deteriorating effect
on them.
INSPECTION
1. Major Castings: Check for cracks, war-
page, stripped screw threads or dam-
aged mating surfaces. Passages in
castings must be free of restrictions.
2. Float Assembly: Should be discarded
if float is damaged in any way.
3. Choke Plate: Should be replaced if
edges have been nicked or if protec-
tive plating has been damaged.
4. Choke Shaft: Should be replaced if
bent or nicked.
5. Choke and Throttle Linkage: Discard
and replace any linkages that are
bent or worn.
6. Throttle Shaft: Check the throttle
shaft(s) in its'bore for binding.
Check the throttle plate(s) for burrs
which prevent proper closure.
7. Springs: Distorted or broken springs
must be replaced.
8. Governor: Check for cracks or strip-
ped threads in housing and replace if
any irregularities are found.
9. Screws, Lockwashers and Nuts: If
stripped threads, distortion or other
damage is found in any of these parts,
discard and replace.
CGES-125-T Page 27
PRINTED IN UNITED STATES OF AMERICA
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