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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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