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TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ADJUSTMENT PROCEDURE INSTALLATION AND ADJUSTMENTS Off Engine Fast Idle Adjustment If the carburetor was removed from the truck for replacement or overhaul procedures, it is recommended that a preliminary fast idle adjustment be performed as follows. 1.  After carburetor is completely assembled open throttle with throttle lever and close the choke plate. 2.  Invert carburetor.  Insert gauge (from gauge set SE-2425 or drill of same diameter) upstream between throttle plate and throttle body of the primary bore (see Fig.  51). Figure 51  Checking Throttle Plate Clearance Fast Idle Throttle Plate Clearance Engine Speed (Gauge or Drill Sizes) V-392 2000 RPM .040 MV-404 2400 RPM .045 MV-446 2400 RPM .045 V-537 2000 RPM .045 V-605 2000 RPM .045 3.    With  gauge  or  drill  held  in  place  by  the  primary  throttle plate  against  the  bore,  adjust  the  fast  idle  screw  until  the screw touches the cam lightly (see Fig.  54). 4.    The  gauge-or  drill  size  dimension  for  the  throttle  plate clearance and fast idle speed are given above: 5.     After   the   carburetor   is   installed   on   the   engine,   warm engine to operating temperature, connect tachometer and check fast idle reading with above specifications. Installing Carburetor on Engine Always  make  a  thorough  inspection  of  the  carburetor  before installing on the engine.  Operate the choke and throttle levers to be sure choke and throttle plates function properly.  Make sure unit is clean and undamaged in any way.  Mating surface of intake manifold must also be    <-f clean and free of burrs or   damage.      Use   a   new   flange   gasket   and   secure   the carburetor to the intake manifold with mounting nuts and lock washers.  Do not tighten nuts all the way down.  Connect the fuel line, distributor vacuum line, governor lines (where used) and   throttle   and   choke   linkage.      Tighten   mounting   nuts alternately  and  evenly  in  a  criss-cross  pattern  to  compress flange gasket.  Draw nuts down tightly. Loading the Throttle Redundant Safety Spring Loading  the  linkage  is  accomplished  by  rotating  the  throttle lever  to  wide  open  throttle  by  moving  accelerator  control  rod to  the  right.    Do  not  rotate  throttle  lever  directly,  since  it  will snap to the closed position, then attach throttle return spring to the trip lever.  Secure opposite end of throttle return spring to throttle return spring anchor bracket.  Slowly return throttle lever to idle position. CAUTION Whenever throttle return spring is disconnected at either end, the throttle linkage at the carburetor will snap to the closed  position  with  a  spring  force  sufficient  to  cause possible personal injury. ON ENGINE ADJUSTMENTS Fuel Level Adjustment Position  the  truck  on  a  level  floor.    Be  sure  the  fuel  pump pressure is within specifications.  Operate the engine until the normal,  stabilized  operating  temperature  has  been  reached. Place  a  suitable  container  below  the  fuel  level  sight  plug  to collect any spill-over of fuel.  Check each fuel bowl separately. With  the  engine  stopped  remove  the  air  cleaner  assembly, fuel level sight plug and gasket and check the fuel level (Fig. 52).  The fuel level within the bowl should be at the lower edge of   the   sight   plug   opening   +   1/32".      If   the   fuel   level   is satisfactory, install the sight plug. CGES-125-T  Page 34 PRINTED IN UNITED STATES OF AMERICA

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