Quantcast  PRE-1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4523)  CALIBRATION  (Contd) - TM-9-2815-237-34_146

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TM 9-2815-237-34 2-33.  PRE-1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4523)  CALIBRATION  (Cont’d) (b)  Energize  electric  shutoff  solenoid  and  check  delivery  against  the  chart  below. THROTTLE MM 3 / CAM   MOVEMENT RPM POSITION STROKE” (DEGREES) HOUSING   PRESSURE 150 WOT 28 min. 400 WOT 47 min. 400 WOT*** 4 max. 650 Low  idle 10-18 1.5 min. 650 Low  idle 2.75 min. 0-1  psi  (0-6.9  kPa)** 1500 21.5-23.5 2.25-4.75 2000 WOT 51.0-55.0 0.5-2.5 3200 WOT 4.25-7.25 3200 Low  idle 10.0 max. 3600 WOT 44.5  min. 3900 WOT 42.5 min. 4200 8 max. * Maximum cylinder variation should be ± 6 mm3 from the average flow of all cylinders. **  With  housing  pressure  cold  advance  solenoid  energized. ***  With  electric  shutoff  solenoid  de-energized. 10.  Disconnect  pump  and  mount  in  holding  fixture. 11. Using air timing gage, check pump timing. Set to -0.75 to +1.25 degrees. 12.  Refer  to  para.  2-7,  Engine  Troubleshooting,  to  diagnose  any  malfunctions  encountered  during checkout. d. Injection Pump Settings (Following Pump Repair) 1. Roller-to-roller dimension must be 1.981 ± 0.0005 in. (50.32 ± 0.013 mm). With oversize cam ring installed,  roller-to-roller  dimension  will  be  1.987  ±  0.0005  in.  (50.47  ±  0.013  mm).  Maximum eccentricity allowed is 0.008 in. (0.20 mm) TIR. 2.  Linkage  gap  must  be  0.130-0.175  in.  (3.30-4.45  mm). (a)  Mount  the  pump  horizontally  in  holding  fixture  and  remove  governor  cover. (b) Hold the throttle lever in the wide-open throttle (WOT) position. Rotate pump drive shaft counterclockwise until a click is heard as the rounded contact points on the governor arm engage  the  slots  in  the  thrust  sleeve.  Continue  to  rotate  the  drive  shaft  until  the  gap  between the governor arm and pump housing is minimal. (c) Using linkage gap tool, check the clearance limits between the rear of the shutoff shaft and the  vertical  tab  on  the  linkage  hook. (d)  If  adjustment  is  required,  loosen  governor  linkage  hook  adjustment  screw  and  extend  the linkage  hook  to  its  maximum  open  length  (throttle  lever  must  be  in  WOT). (e) Insert the appropriate step of the linkage gap tool between the vertical hook tab and the throttle  shaft,  with  the  step  facing  the  shaft.  The  tool  must  be  held  vertically  and  parallel to  the  linkage  hook  tab. (f) With the linkage hook pin seated firmly in the governor arm slot and the governor arm in the  minimal  gap  position  (step  2.(b)),  shorten  the  linkage  hook  assembly  until  the  face  of  the vertical  tab  is  flush  against  the  tool.  Tighten  adjusting  screw  to  12-15  lb-in.  (1  N•m). (g) Recheck linkage gap and adjust if necessary. 2-128


 


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