TM 9-2815-237-34 2-140.6 Change 1 2-35.2.   (6.5L) FUEL INJECTION PUMPS (DB2831-5485 OR DB2831-5079) CALIBRATION This task covers: a. Test Bench Requirements c. Injection Pump Check (Prior to Service) b. Injection Pump Information d. Injection Pump Settings (Following Pump Repair) Test Equipment Digital tachometer Voltage source (variable) Pressure gauge (0-160 psi, 1 psi increments) Pressure gauge (0-30 psi) Vacuum gauge (0-30 in. Hg) Flowmeter with three-way valve Temperature gauge (0°-250°F) Zero-backlash coupling device Calibrating nozzles and lines Orifice 13211 Calibration stand Materials/Parts Calibrating fluid (Appendix B, Item 4) Sealing compound (Appendix B, Item 19) Manual References TM 9-2815-237-34P a.  Test Bench Requirements The fuel injection pump requires a test bench capable of at least 2250 rpm shaft speed. The test bench must be equipped with the following items: (a)   A zero-backlash coupling device. (b)   A digital tachometer. (c) A variable voltage source. (d)   Test gauges: (1)    0-160 psi (0-1103 kPa) pressure gauge calibrated in 1 psi increments to measure transfer pump pressure. This gauge should be located as close as possible to the pump, with an in-line shutoff valve located at the pump. (2)    0-30 psi (0-206.9 kPa) pressure gauge to measure housing pressure. (3) 0-30 in. Hg (0-101.3 kPa) vacuum gauge to measure transfer pump lift. This gauge should be in the supply line to the pump, with a shutoff valve between the gauge and the oil source. (4)    A flowmeter for measuring return oil should be used with a three-way valve to permit the flowmeter to be in use only during the return oil check. (5)    0-250°F (-17.8-121.1°C) temperature gauge, located at the pump inlet, to monitor inlet temperature. INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix E, Item 1) Special Tools Roller-to-roller setting tool (Appendix E, Item 45) Linkage gap tool (Appendix E, Item 49) Automatic advance indicator (Appendix E, Item 50) Vacuum valve block gauge (Appendix E, Item 51) Protractor (Appendix E, Item 52) Air timing gauge (Appendix E, Item 53) Holding fixture (Appendix E, Item 46) Torx drive (Appendix E, Item 42) NOTE The following calibration procedure applies to 6.5L turbocharged fuel injection pumps. Refer to para. 2-34 for calibration of 1990 6.2L and above pumps and para. 2-33 for pre-1990 6.2L pumps.