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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Automatic Choke
Figure 57.  Adjusting Governor Using Tool SE-2072-2 1. Lock 5. Vertical Hole 2. Counterweight 6. Distributor Shaft 3. Adjusting Tool 7. Governor Valve Body 4. Screw (Tang) 8.  Reinstall governor clamp and gasket assembly. 9.  Reinstall governor seal. 10.  On distributors so equipped, be sure the governor spinner valve  air  cleaner  is  cleaned  or  replaced  at  regular  intervals depending on severity of operation. Automatic Choke The     automatic     choke     assembly     consists     of     a bimetallic    thermostat    spring    and    vacuum    piston.        The automatic choke assembly is mounted on the carburetor main body.      A   passage   through   the   main   body   connects   the vacuum  system  to  the  manifold  area.    When  the  engine  is cold,  the  bimetal  spring  closes  the  choke  plate  for  starting. When  the  engine  starts,  manifold  vacuum  is  applied  to  the choke piston through a passage in the main body and with the help  of  air  flow  on  the  offset  choke  plate,  opens  the  choke against the tension of the bimetal spring. A heat stove is installed in the exhaust manifold and an   asbestos-covered   tube   connects   the   heat   stove   to   the choke   housing.      As   the   engine   is   warmed   up,   hot   air   is circulated to the choke housing to warm up the bimetal spring. As  the  spring  warms  up,  its  tension  will  be  released  on  the choke shaft and allow it to open gradually.  The warm air then passes   through   a   hole   in   the   choke   piston   and   down   the passage in the main body to the manifold vacuum passage. A choke lever is provided on the side of the carburetor which actuates a fast idle cam during choking.  The fast idle cam has   a   series   of   stops   on   one   side   which   are   designed   to increase the engine idle RPM for smoother running when the Figure 58.  Automatic Choke Assembly 1.  Piston and Lever 5.  Vacuum Passage Assembly 6.  From Heat Tube 2.  Choke Housing 7.  Vacuum Passage 3.  Choke Housing Plate 4.  Thermostat Spring engine is cold.  As the engine is warmed up and the choke opens, each  step  on  the  fast  idle  cam  permits  the  engine  to  run  at  a slower RPM. An adjustable piston stop screw controls the initial travel of the choke piston.  The piston, in turn, controls the initial opening of the choke plate or choke qualifying dimensions.  To check the choke qualifying dimension, follow the procedure outlined below: 1.   Bend a paper clip as shown in insert in Fig.  59). 2.   Place bent end of clip on top of piston and depress piston until it bottoms on stop screw (Fig.  59). 3.   Rotate choke lever tang counterclockwise until choke piston link touches top of piston (Fig.  59). 4.   Measure clearance on lower edge of choke plate at inner wall of air horn. See SPECIFICATIONS for correct setting. 5. Adjust clearance by moving adjusting screw in or out. 6.   After adjustment has been established, seal off head of adjusting screw with sealing compound. A  small  unloader  lever  is  provided  on  the  throttle  shaft which will manually open the choke plate when the throttle lever is at the wide open position.  This permits the operator to relieve an over choke condition. To overcome a flooded CGES-125-T Page 39 PRINTED IN UNITED STATES OF AMERICA ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ADJUSTMENT PROCEDURE

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