TM-9-2815-237-34 HMMWV Engine Direct Support & General Support Maintenance Manual Download
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TM 9-2815-237-34 2-140.8 Change 1 2-35.2. (6.5L) FUEL INJECTION PUMPS (DB2831-5485 OR DB2831-5079) CALIBRATION (Cont’d) (b) Energize electric shutoff solenoid and check delivery against the chart below: 10. Disconnect pump and mount in holding fixture. NOTE Perform step 12 to check pump timing on the DB2831-5079 fuel injection pump. 11. Using air timing gauge, check pump timing. Set to 1.5 to 3.5 degrees. 12. Using air timing gauge, check pump timing. Set to 1.0 +1.0 degrees. 13. Total throttle travel from low-idle to wide-open throttle should be 75-84 degrees. 14. Refer to para. 2-7, Engine Troubleshooting, to diagnose any malfunctions encountered during checkout. 1. Roller-to-roller dimension must be 1.975 ± .001 in. (50.19 ± .025 mm). With oversize cam ring installed, roller-to-roller dimension will be 1.882 ± .005 in. (50.34 ± .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 driveshaft 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 driveshaft until gap between governor arm and pump housing is minimal. (c) Using linkage gap tool, check clearance limits between rear of shutoff shaft and vertical tab on 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 appropriate step of linkage gap tool between vertical hook tab and throttle shaft, with step facing shaft. The tool must be held vertically and parallel to linkage hook tab. (f) With linkage hook pin seated firmly in governor arm slot and governor arm in the minimal gap position (step 2.(b)), shorten linkage hook assembly until face of vertical tab is flush against tool. Tighten adjusting screw to 12-15 lb-in. (1 N•m). (g) Recheck linkage gap and adjust if necessary. d. Injection Pump Settings (Following Pump Repair) THROTTLE MM 3 / CAM MOVEMENT PRESSURE RPM POSITION STROKE* (DEGREES) TRANSFER PUMP HOUSING 150 Low-idle 36 min. 0-12 psi (0-83 kPa) 400 WOT 57 min. 400 WOT** 4 max. 700 Low-idle 10-18*** 3.0 min. 8-12 psi (55-83 kPa) 700 Low-idle **** 0-1 psi (0-7 kPa)** 1800 WOT 65.6-70.5 2000 WOT 3200 WOT 58.5 min. 2.0-4.0 3200 ADJ 21.5-23.5 5.0-7.5 3200 Low-idle 11.0-12.0 3650 WOT 32 min. 3900 WOT 15 max. * Maximum cylinder variation should be ± 6 mm 3 from the average flow of all cylinders. ** With electric shut-off solenoid de-energized. *** Reset using low-idle screw. **** Minimum of 1.25 degrees more than reading.