TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 (b) Remove bleeder valve (1, fig. 3-281) fr om water separator cover (I 0). Remove eight water separator cover capscrcws (2) and flat I wnshcr s (4) and re m ove cover fro111 fuel filter body M (7). Rcmovc and discard pr c1· o1ccl pack ing (9), tinal water separator filter (5) and two outer water scprator filter cle ments (6). (2) Automatic rain system, (a) Disconnect automatic water drain wir- ing harness (19, fig. 3-282) from water separator control module (44). Remove three assembled washer bolts (42) and tlat washers (43) attaching module and electrical lead loop clamp (32), to mounting plate (45). Remove loop clamp from wir- ing harness and control module from bracket. (b) Remove automatic water drain wiring harness (19) from water separator automatic drain solenoid "alve (31). Remove automatic drain sol- enoid valve tube assembly (41) from elbow (46). (c) Remove two assembled washer bolts (20) and remove solenoid valve (31) from bracket (45). Remove adapter (18) from solenoid valve "IN" opening, and elbow (46) from "OUT" opening. (d) Disconn ect and r emove hose assembly  (17, fig. 3-282) from drain valve tee (28). Remove 8 nut and washer secu ring loop clamp (35.1 ). Dis- connect and remove hose assembly (36) from bulkhead connector (37). Remove angl e bracket (4) f r om bulkhead connector and remove bulkhead connector and drain valve (21) from tee. b. Oea11i11g, !11spection and Repair. (I) Refer to paragraphs 3-36. 3-37, and 3-38. (2) VfaualJ y inspect the drain control module and probes assembly r cracks, den ts, damaged threads and to or fra yed insulation on the probe H leads. Check to be certain red shrink tubing is  i ntact on upper probe lead for identification. Replace damaged modules. (3) Functionally inspect the control assembly as follows: (a) Connect a 24-vdc power supply to the power supply (Jeft side) connector of the control. Make certain the positive (+) l ead is co nnected to pin A and the negati ve lead is connected to pin B. (b) Connect a de voltmeter to the power output (right side) connector of the control. Make certain the meter posi t i ve (+) lead is connected to p i n A and the negative lead is connected to pin B. (c) Tum power supply on. Lightly press the tip or the low (short) probe to the negative (-) terminal of lhe 24-vdc power supply. The volt- meter should show zero voltage. ( d) Continue Lo hold the low probe on the U te rminal and Lightly press the tip of the high n (identified by red shrink tube) probe to the te rmi na l also. TI1e voltmeter should now show 24 volts. 3·192 Change 3 (e) Remove the high probe only. The meter should continue to show 24 volts for 18 (±3) seconds and then drop to zero volts. ( Continue to hold the low probe to the terminal and oga in press the high probe to the terminal. The voltmeter should continue to show zero volts. ) Conti nue to hold both probes 011 the terminal. Tum the power supply off for one sec ond or longer. Tum on the power supply and the voltmeter should again show 24 vol ts. (h) Remove lhe high probe from the ter- minal and the meter should continue to show 24 volts. Remove the low probe f rom the tem1inal in less than I 5 seconds and _the meter should retu to zero v olt s. (i) Again press the low probe and then the high probe to the terminal and meter should rel u to 24 volts. ) Modules that do not respond as in (c) thr ough (i) above are not functioning correctly and must be placed. c. Assembly. (1) Automatic drain system. (a) Install adapter (18) in solenoid valve (31) "IN" opening and elbow (46) in "OUT" opening ai1d install assembled solenoid valve on bracket (45) and secure with two assembled washer bolts (20). (b) Install automatic drain solenoid valve tube assembly (41) on elbow (46). Install automatic drain wiring haess (19) on automatic drain sol- enoid valve (31). (c) Attach loop clamp (32) on automatic drain wiring haess (19). Install control module (44) on mounting plate (45) and wiring harness loop clamp on control module. Secure control module and loop clamp to mounting bracket with three assembled washer bolts (42) and flat washers (43). Connect automatic water drain wiring harness (19) to control module (44). (d) l nstall drain valve (27) and bulkhead connector (37) and tee (28), and .install angle bracket (38) on bulkhead connector. Install hose assembly (36) on bulkhead connector and hose assembly (17) on tee. Attach loop clamp (35.1) I with nut and washer. (2) Fitelfwciter separator filter. (a) Install two new outer water separator filter elements (6, fig. 3-281) and a new final filter element (5) in filter body (7). Using a new pre- formed packing (9) install cover (10) on fuel filter body and secure with eight capscrews (2), lockwashers (3) and flat washers ( 4). Install bleeder valve (1) in separator cover. (b) Install fuel drain elbow (35, fig. 3-282) in fuel/water separator filter. Install fuel outlet elbow (2, fig. 3-279) and fuel inlet elbow (30) in fuel/water separator filter (1). ) )