Quantcast Fuel Bowls and Metering Blocks - TM-5-4210-230-14P-1_747

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Figure 46 Components Location on Main Body
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Figure 48  Bench Adjustment of Fuel Bowl Float
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 REASSEMBLY Fuel Bowls and Metering Blocks Refer to Fig.  28 for the correct location of the fuel bowl parts. The  primary  and  secondary  fuel  bowls  and  metering  blocks are installed on the main body in the same sequence. Primary Fuel Bowl and Metering Block: 1.    Using  special  socket  SE-1772-1  install  new  gasket  and power valve assembly in metering body. 2.  Install the two main jets using special tool SE-1772-6. 3.    Where  used,  install  "0"  rings,  using  petroleum  jelly  as  a lubricant  on  accelerator  pump  fuel  transfer  tube  and  install tube in metering block. 4.      Install   fuel   bowl   to   metering   block   gasket   to   metering block.    Be  sure  all  punchings  are  removed  from  gasket  and pump   passage   and   gasket   aligns   with   pump   passage   in metering block. 5.  Install fuel filter screen, fuel inlet fitting and new fuel inlet fitting gasket. 6.  Lubricate the tip of a new accelerator pump synthetic valve (where used) with a small amount of petroleum jelly and insert tip into accelerator pump cavity center hole.  Using a pair of needle nose pliers reach into the fuel bowl and grasp the valve tip.  Pull the valve in until it seats in the pump cavity wall and cut off the tip at the retaining shoulder. In  some  4150  carburetor  fuel  pump  cavities  there  will  be  a very  small  bleed  hole  from  the  fuel  bowl.    This  bleed  hole allows  vapor  pressure  to  escape  from  the  fuel  pump  cavity into the fuel bowl.  This pressure bleed off prevents fuel spill over through the fuel pump discharge nozzles.  The bleed hole must be checked to make sure it is not clogged. 7.  Where used, check accelerator pump inlet check ball travel (Fig.      47).      Clearance   between   ball   and   retainer   bar   is specified  at  .011  to  .017".    Best  operation  can  be  expected with clearance set at low end of specifications (.011"-.014"). Adjustment is made by bending retainer bar.  If adjustment is necessary,  extreme  care  must  be  taken  to  prevent  possible damage to ball and/or seat. Figure 47  Checking Accelerator Pump Inlet Check Ball Clearance (Not used on All Carb.) It is emphasized that the check ball setting mentioned above is a critical item in obtaining instant pump response to throttle movement.  Ball travel in excess of .017" can easily cause a lag   in   fuel   injection   with   consequent   engine   falter   during throttle opening. 8.      Position   pump   diaphragm   spring   in   recess   and   install diaphragm  assembly.   Note  that  the  flat  rivet  head  faces  up. Place   pump   diaphragm   cover   in   position   making   sure   the holes  are  aligned.    Install  the  four  screws  and  lock  washers. Tighten them alternately to evenly compress the diaphragm. 9.      Obtain   new   "O"   ring   and   using   petroleum   jelly   as   a lubricant   slide   "O"   ring   into   groove   on   needle   and   seat assembly.    Install  assembly  in  fuel  bowl.    Always  use  new gasket between adjusting nut and fuel bowl and also between lock screw and adjusting nut. 10.      Insert   fuel   inlet   baffle   in   bowl   over   needle   and   seat assembly. 11.  Place conical spring on locator of float lever and slide the float  with  the  spring  onto  shaft  in  fuel  bowl.    Secure  with retainer. CGES-125-T  Page 31 PRINTED IN UNITED STATES OF AMERICA

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