Quantcast b. Injection Pump Information

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TM 9-2815-237-34 2-34.  1990  (6.2L)  FUEL  INJECTION  PUMP  (DB2829-4879)  CALIBRATION  (Cont’d) (e) Calibrating nozzles and injection lines: (1) Eight 0.020-in. (0.5 mm) orifice plate nozzles set at 1700 ± 25 psi (11,721 ± 172 kPa). (2) Eight 0.093-in. (2.36 mm) inside diameter by 25 in. (63.5 cm) long injection lines. (f)  Calibrating  fluid  conforming  to  SAE  J967,  maintaining  a  temperature  of  110°-115°F  (43°-46°C) at  the  pump  inlet  over  all  speed  and  load  ranges. (g) Orifice fitting in the inlet line between the supply pump and shutoff valve, to maintain constant fluid circulation and temperature. b. Injection Pump Information NOTE All  speeds  are  in  engine  rpm  unless  otherwise  noted. 1.  Injection  pump  operating  speed  is  half  of  engine  speed. 2.  Injection  pump  rotation  is  counterclockwise. 3. Injection pump is timed to the outlet port in the 10 o’clock position, when viewed from the transfer pump  end. c. Injection Pump Check (Prior to Service) 1. 2. 3. 4. 5. 6. 7. 8. 9. 2-132 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 wide-open throttle (WOT) for  10  minutes  to  bring  to  operating  temperature  and  clear  air  from  system. Tighten all connections securely. Check connections for leaks while operating. Check fuel delivery at 650 rpm (low idle). Fuel delivery should be 10-18 mm3/stroke. If fuel delivery is not within the range specified, adjust low idle screw. Turn screw clockwise to decrease or counter- clockwise  to  increase  fuel  delivery. Check housing pressure at 650 rpm, while applying 17.6 V to housing pressure cold advance solenoid. Housing pressure should be 0-1 psi (0-7 kPa) and 8-12 psi (55-83 kPa) when de-energized. Check electric shutoff solenoid for pull-in with 17.6 V maximum with throttle lever in low idle position  at  400  rpm. 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


 


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