TM  9-2320-387-24-l -- REFERENCE   INFORMATION Watch  the  fuel   pump   pressure   while   slowly accelerating    the   engine   from   idle  to  maximum    speed. The  pressure    should   always   be  greater   than   zero.     If you   can  drive   the  vehicle   while   measuring    the pressure,   check   to  be  sure   it is  still  above   zero   even during   maximum    acceleration     (maximum    engine power).    You   can  use  STUICE-R test  24  with   control function   02  (minimum). NOTE Rapidly     accelerating the   engine    with   the transmission in  neutral   doesn’t   work  for  this engine   because   the  fuel  supply   can’t  increase    as fast  as  the  engine   can  accelerate    so  you  won’t get  good  test  results. Proper   engine   performance     depends upon  the  availability    of  the  correct   fuel volume   to  the  injection   pump. Pay  attention    to  when   the  engine    runs  rough. If  it runs  rough   only   while  warming    up  after  a  cold   start,   it may  be  a  glow   plug    problem   and  you   should   run  the Glow  Plug  Circuit   tests. Rough   running    may  also  be  caused   by  air  leaks   in  the fuel  supply   lines.    Air  in the  fuel   should   purge   itself while   idling.    If  rough   running   occurs   after   a  period of high  speed   or  high  power   running   but  seems   to  go away   after   idling,   then   look  for  air  leaks   in  the  fuel supply   lines  and  fittings. If rough running occurs  while driving   but  idles  ok,  check   the  fuel  return   check   valve for  any  malfunctions     (para.   3-36). Try  to  adjust   the  engine   idle  speed   by turning   the   idle  speed   screw   (para.   3-45). Continue   testing   if you   can  adjust   the speed   property. If you   cannot,    notify DS  maintenance     (chapter    14). Engine   must   be  at  normal   operating    temperature when   making   speed   checks.     Air  filter  must   be  in place  and  all  accessories    (lights,   heater   fan,   etc.) must  be  turned    off. Thts  engme   has  a  min-max    governor    which   controls engine   speed   at  both   idle  and   full  thronle. FUEL  SYSTEM I FUEL   PUMP  VOLUME   TEST 1. Disconnect    fuel  line  at  injection   pump   inlet and   route   fuel   line  into  a  suitable    1 quart (1  liter)  container. I 2.  Crank   the  engine   for  30  seconds. 3.  If the   pump   and   lines  are  ok,  you   should   gE about   1 pint   (l/2    quart)   (.5  L)  in  30  second5 FUEL    PUMP    PRESSURE STE/lCE-R     TEST   24 (SLUICE already    connected    to  DCA   and turned   on) 1. Select   Fuel  Supply    Pressure    test, Test   24. 2.  Perform   CAL. 3.  Crank   (or  start)   the   engine. NOTE   : STE/ICE-R     can   display   a  pressure below   0.    Be  sure  to  notice   if the  display   is negative. I FUEL   PUMP    PRESSURE     TEST PRESSURE GAUGE 1. Connect    a  tee   into  the  fuel  line  between the  fuel  filter   outlet   and  the  injection pump   inlet. 2.  Attach   gauge    to  tee. 3.  Crank   (or  start)   engine. ENGINE   RPM STEIICE-R   TEST  10 1. Start  Test   10.  Engine    RPM. 2.  Crank   or  start  the   engine.    Displayed reading   is  RPM.    Cranking    rpm  should be  at  least   100  rpm.    Idle  rpm should   be  700-750. 2-103