TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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TM 9-2815-237-34 2-140.10 2-35.2. (6.5L) FUEL INJECTION PUMPS (DB2831-5485 OR DB2831-5079) 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 mm 3 /stroke maximum. (2) Re-energize electric shutoff solenoid and check delivery against the chart below. 23. Disconnect pump and mount in holding fixture. NOTE Perform step 25 to check pump timing on the DB2831-5079. 24. Using air timing gauge, check pump timing. Set to +0.25 degree ± 0.50 degree. 25. Using air timing gauge, check pump timing. Set to 0 ±0.50 degrees 26. Tighten all fasteners to specifications. Refer to para. 2-32d. THROTTLE MM 3 / CAM MOVEMENT PRESSURE RPM POSITION STROKE* (DEGREES) TRANSFER PUMP HOUSING 150 Low-idle 37 min. 16 psi (110 kPa) min. 0-12 psi (0-83 kPa) 400 WOT 58 min. 400 WOT** 4 max. 400 Low-idle*** 700 Low-idle 12-16 3.5 min. 8-12 psi (55-83 kPa) 700 Low-idle 1.25 min. 0-1 psi (0-7 kPa) 1500 WOT 4 max. 1500 WOT 68.5-69.5 2000 WOT 56 max. **** 60-62 psi (414-427 kPa) 3200 WOT 59.5 min. 2.50-3.60 3200 ADJ 21.5-23.5 5.25-7.25 3200 Low-idle 11-12 3400 WOT 49-52 3.50-4.50 3500 WOT 45 min. 3650 WOT 31.5 min. 3900 WOT 15 max. 125 psi (862 kPa) max. * Maximum cylinder variation should be ± 6 mm 3 from the average flow of all cylinders. ** With electric shut-off solenoid de-energized. *** Check electric shutoff solenoid for pull-in with 8.8 volts maximum. **** Minimum of 1.25 degrees more than reading.