TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 NOTE When pump is open to make adjustments, open main control valve to flowmeter  wide  open  and  move  throttle lever    back    and    forth    until    flowmeter shows   no   air,   so   air   may   be   expelled more rapidly from system. (15)  Setting Idle Speed. (a)   Close test stand main flow control valve and open idle orifice valve. (b)   Set throttle shaft in idle position (toward gear pump) and hold firmly against stop. (c)   Run test stand at 168 psi (1159 kPa). (d)   Check pressure on fuel manifold pressure   gauge;   it   should   be   168   psi (1159  kPa).    If  pressure  is  low,  screw idle adjusting screw (16, figure 13-23) in with the spring adjusting tool.  To lower pressure, back out screw. (16)  Weight Assist Pressure Check. (a)   Decrease    pump    speed    to    800    rpm. Adjust flowmeter if not as specified. (b)   The   fuel   manifold   pressure   should   be 129 to 135 psi (890 to 931 kPa) at'1500 rpm. (c)   If fuel pressure is low, add shims behind the   governor   weight   assist   plunger   in the  governor  weight  carrier  (16,  figure 13-12)    or    (24,    figure    13-21).        To decrease   pressure,   remove   shims.      If adjustments are required, recheck entire pump  calibration.    Shims  are  available in  0.007  to  0.016  inch  (0.178  to  0.406 mm). CAUTION Weight  assist  plunger  must  be  installed with   the   smallest   end   to   the   governor plunger. (17)   Check   Pressurizing   Valve.      Loosen   the plug    (1,    figure    13-23)    in    the    governor spring  pack  housing  cover.    Fuel  should leak  around  the  plug  if  the  pressure  valve is properly pressurizing the housing. (18)  Checking Pump Seals. (a)   With   the   test   stand   operating   at   500 rpm,  close  vacuum  valve  in  fuel  pump suction  line  until  vacuum  gauge  reads 15    inches    vacuum.        The    fuel    flow control valve should be open during this check. (b)   Put  a  small  amount  of  light  cup  grease over the vent hole at the mainshaft seal bore  of  the  mainshaft  cover  (30,  figure 13-20). (c)   If lubricant is sucked into the hole at the 15    inch    vacuum    setting,    this    is    an indication  that  the  seals  will  not  permit proper  engine  performance  and  should be replaced. (d)   During   the   above   check,   observe   the flowmeter for air in the meter which may or may not indicate air leakage into the pump.        Air    may    be    entering    lines between  tank  and  pump.    A  slow  leak may not show up promptly as air in the meter.    Observe  fuel  level  in  tank  for possibility     of     low     fuel     causing     air bubbles. (e)   Leakage may occur at the gear pump to housing   gasket   if   gear   pump   is   not positioned correctly. (f) Tighten all capscrews, 13-43