Quantcast 1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4879)  CALIBRATION  (Contd)

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TM 9-2815-237-34 2-34.  1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4879)  CALIBRATION  (Cont’d) 22.  Fuel  delivery  measurement: (a) In order to minimize variations between readings due to residual oil in the graduates, the following  timed  cycle  should  be  used: (1)  Draw (2) Settle 30 seconds (3) Drain 30 seconds (4)   Draw (5) Settle 30 seconds (6) Read graduates (7) Repeat cycle and average readings (b) Check points: (1) At 1500 rpm (WOT) de-energize electric shutoff solenoid. Delivery should be 4 mm3/stroke maximum. (2)  Re-energize  electric  shutoff  solenoid  and  check  delivery  against  the  chart  below. THROTTLE MM’/ CAM   MOVEMENT PRESSURE RPM POSITION STROKE* (DEGREES) TRANSFER   PUMP HOUSING 150 WOT 28 min. 12 psi (83 kPa) min. 0-12  psi  (0-83  kPa) 400 WOT 45 min. 400 WOT** 4 max. 400 Low  idle*** 650 Low  idle 12-16 8-12  psi  (55-83  kPa) 650 Low  idle 1.25 min. 0-1 psi (0-7 kPa) 1500 21.5-23.5 1.0-3.5 2000 WOT 56 max. 60-62  psi  (414-427  kPa) 2400 WOT 0.5-3.0 3200 Low  idle 9.0-10.0 3500 WOT 48-53 4.5-6.5 3600 WOT 47 min. 3800 WOT 33 min. 4050 WOT 15 max. 125 psi (862 kPa) max. * Maximum cylinder variation should be ± 6 mm3 from the average flow of all cylinders. **  With  housing  pressure  cold  advance  solenoid  energized. *** Check electric shutoff solenoid for pull-in with 17.6 volts maximum. 23.  Disconnect  pump  and  mount  in  holding  fixture. 24. Using air timing gauge, check pump timing. Set to +0.25 degree ± 0.50 degree. 25.  Tighten  all  fasteners  to  specifications,  refer  to  para.  2-32d. 26. Apply sealing compound as follows: (a)  Apply  one  drop  at  interface  of  maximum  travel  screw  and  locknut. CAUTION Do  not  allow  sealing  compound  to  enter  gap  between  face  cam  and housing.  Binding  of  the  throttle  shaft  may  result. (b) Apply one drop to threaded end of face cam screw where it protrudes from face cam. (c)  Apply  one  drop  to  interface  of  servo  advance  adjusting  screw  and  rocker  lever,  making  sure sealing  compound  does  not  enter  hex  recess  of  screw. 27.  Install  tamper-proofing  cap  on  guide  stud. 2-135


 


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