TM 5-4240-501-14&PCARBURETIONTwo Piece Flo-JetFig. 85 - Typical Two Piece Flo-Jet CarburetorCheck Upper Carburetor Body for WarpageWith carburetor assembled and body gasket in place, if a.002" feeler gauge can be inserted between the upperand lower bodies at the air vent boss, just below the idlevalve, the upper body is warped or gasket surfaces aredamaged and should be replaced. Fig. 86.Fig. 86 - Checking Carburetor BodyCheck Throttle Shaft and Bushings for WearWear between throttle shaft and bushings should notexceed .010". Check wear by placing a short iron bar onthe upper carburetor body as shown in Fig. 87. Measurethe distance between the bar and shaft with a feelergauge while holding the shaft down and then holdingshaft up. If the difference is over .010", either the upperbody should be rebushed, the throttle shaft replaced, orboth. Wear on the throttle shaft can be checked bycomparing the worn and unworn portions of the shaft.To replace bushings, see "Remove Throttle Shaft andBushings."Fig. 87 - Checking Throttle WearRemove idle valve. On small line Flo-Jet loosen highspeed valve packing nut. Remove packing nut andneedle valve together. On medium and large line Flo-Jetremove high speed valve assembly. Remove nozzle onsmall line Flo-Jet with 19061 screw driver. On mediumand large line Flo-Jet use 19062 screw driver to removenozzle. Using 19061 or 19062 will help to preventdamage to the threads in lower carburetor body. Thenozzle projects diagonally into a recess in the upper bodyand must be removed before the upper body can beseparated from the lower body, or the nozzle will bedamaged. See Fig. 85. Remove screws holding upperand lower bodies together. A pin holds the float in place.Remove pin and remove float and float needle as anassembly. Use wide blade screw driver that fits slot toremove float inlet seat. On carburetors with pressed infloat seats, see "Replacing Pressed In Float Valve Seat."On small Flo-Jets the venturi is a separate part and canbe slipped out of the lower body. Some carburetors havea welch plug. This should be removed, only if it isnecessary, to remove the choke shaft or choke plate.Some carburetors have a nylon choke shaft. Remove asshown in Fig. 88.Fig. 88 - Nylon Choke Shaft24
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