Quantcast  PRE-1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4523)  CALIBRATION  (Contd) - TM-9-2815-237-34_147

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2-129 TM  9-2815-237-34 2-33.  PRE-1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4523)  CALIBRATION  (Cont’d) 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Set  the  throttle  lever  in  correct  low  idle  position  prior  to  calibration  using  throttle  lever  gauge.  The low idle screw must beat 34 ± 2 degrees as measured between vertical centerline of throttle shaft bushing  bore  and  throttle  connection  stud. Flush  the  pump  with  calibrating  oil  to  remove  metal  chips  and  possible  contamination. Before  mounting  the  pump  on  the  test  stand,  check  the  drive  shaft  for  freedom  of  rotation  in  the housing. Pump should be mounted securely in the appropriate adapter, and the intermediate coupling  checked  for  freedom  of  movement. Connect supply and return lines securely. Install  high  pressure  injection  lines.  Use  copper  gaskets  or  steel  washers  where  required.  Leave  fuel line  connections  at  the  pump  and  nozzles  loose. Apply  17.6  V  to  electric  shutoff  solenoid  and  operate  pump  at  2000  rpm  (WOT)  for  10  minutes  to bring  to  operating  temperature  and  clear  air  from  system. Tighten all connections securely. Check connections for leaks while operating. Set  transfer  pump  pressure  at  2000  rpm  (WOT)  for  70-76  psi  (482.7-524  kPa);  test  stand  boost should be set at 5 ± 0.5 psi (34.5 ± 3.4 kPa). Set  return  oil  flow  to  225-375  cc/minute  at  2000  rpm  (WOT). Measure  housing  pressure: (a) Check housing pressure at 650 rpm, with throttle shaft in low idle position, pressure should be  8-12  psi  (55-83  kPa). (b)  Energize  housing  pressure  cold  advance  solenoid  with  17.6  V,  housing  pressure  should  be 0-1  psi  (0-6.9  kPa). With governor cover removed and throttle shaft in low idle position, set min-max governor assembly for 14.0 ± 2 mm3/stroke  at  650  rpm  (fuel  reading  with  cover  installed). Check electric shutoff solenoid for pull-in with 17.6 V maximum with throttle lever in low idle position  at  400  rpm. Transfer  pump  lift  should  be  18  in.  Hg  (60.8  kPa)  at  400  rpm. Mechanical/Light  Load  Advance  Setting (a) Check housing pressure at 650 rpm, with throttle shaft in low idle position, pressure should be  8-12  psi  (55-83  kPa). (b) With throttle in a WOT position, rotate face cam to its maximum lift position in contact with the  cam  roller. (c)  At  2000  rpm,  adjust  trimmer  screw  for  1.5  degrees  cam  advance. (d) Set throttle for 22.5 ± 1 mm3/stroke at 1500 rpm and rotate face cam to obtain 3.5 degrees cam  advance. (e) Tighten face cam screw to 28-32 lb-in. (3-4 N•m) and check face cam retention. (1)    Put  0.005-in.  (0.127  mm)  feeler  gauge  between  throttle  shaft  mylar  washer  and  housing (2) Put throttle shaft in idle position. Squeeze throttle shaft and face cam tightly toward each other  and  rotate  face  cam  as  lower  roller  rests  approximately  in  middle  at  low  idle  step. Tighten  screw  to  30  lb-in.  (3  N•m)  with  torx  drive  and  remove  feeler  gauge. Set  total  throttle  travel,  With  throttle  in  low  idle  position,  align  zero  degree  mark  on  protractor with  center  of  rib  on  rocker  lever.  Move  throttle  to  WOT  and  adjust  maximum  travel  screw  to 80-84  degrees.


 


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