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

) ) 9. Disassembly. Refer to paragraph 4-6 for removal of the dust detector components from the enne. The pr- sure switch (I, fig. 4-l 7), bracket (2), air hoses (5, 6, 8, and 9) adapters (10 and l 3), and preformed packings (11 and 12) were removed and dis- assembled during replacement of dust detector components for service (para 4-6). 4-10. Cleaning. Refer to paragraph 3-36. 4-11. Inspection and Repair. a. Refer to paragraphs 3-37 and 3-38 for general inspection and repafr. b. Wiring harness repair is limited to re- placement of faulty connectors and to the sub- stitution of a jumper wire for a defective haess wire. When repair is necessa1·y, free the lead, TM 9-2815-220-34 harness, or cable only insofar as necessary to perform the repair. Refer to figures 3-305, 3-306, and 3-307 for instructions concerning replacement of c.able connectors, female plugs, male plugs, ancl female receptacles. c. Install ru1 adapter (13, fig. 4-17) in the bottom (low pressure) opening in pressure switch (l ). Suck on con11ector with the mouth. The pressure switcl1 plunger (1, fig. 4-17) must pop up. lf the plunger does nol pop up, remove adapter and replace pressure switch. d. Using a voltmeter, check for continuity across the two pressme switch connector pins. If there is no continuity, 1·eplace pressure switch (I, Ilg. 4-17). 4-12. Assembly. The dust detector components and electrical har- ness wl ll be assembled during engine assembly, paragraph 4-6b. ction V. REPAIR OF DUST EJECTOR SYSTEM'. 4-13. GeneraI. 1his section covers the repafr of the dust ejector system. Rer to paragraphs 3-25 through 341 for general repair procedures. Specific instructions on disassembly, cleaning, inspection, and assembly accompany the repair instructions. 4-14. Disassembly. Refer to paragraph 4-7 for removal of the dust ejector components from the engine. a. Left bank. (l) Loosen hose clamp (5, fig. 4-18), that is nearest the left bank ejector tube (28). (2) Remove 2 machine bolts (l 5) and ·self-locking nuts (19) from loop clamps (16 and 22). Remove exhaust assembly from engine. (3) Loosen remammg hose clan1ps (5). Separate and remove hoses (6, 12, l 3) and tube (20). Remove hose clamps (5 , 16, 22). (4) Scribe alinemenl marks on flanges of exJ1aust pipe cap assembly (11) and scavenge tube (25). (5) Remove capscrcw (8), lock washer (9), machine bolt (15), and lockwasher (21) and sepate exhaust pipe cap assembly (I I) from scavenge tube (2 5). Remove and discard gasket (10). (6) Loosen two hose clamps (39). (7) Remove breather tube (41), hose (40), and two clamps (39). (8) Remove 11 machine screws (1 ), plain nuts (3 J ), lock washers (30), and flat washers (2). (9) Remove and cLiscard insulators (26 and 29). b. Right bank. (I ) Loosen hose clamp (5, Ilg. 4-18) that is nearesl the 1ight bank ejector tube (4 ). (2) Remove 2 machine bolts (15) and self-locking nuts (19) from loop clamps (16 and 22 ). Remove exhaust assembly from engine. (3) Loosen remaining hose clamps (5). Separate and remove hoses (6, 12, l 3) and tube (14). Remove hose clamps (5, 16, 22). (4) Scribe alinement marks on Oangcs of exhaust pipe cap assembly (11) and scavenge tube (7). (5) Remove capscrew (8) and lockwasher (9) and maclli 11e bolt (15) and lockwasher (21) and separate exhaust pipe cap assembly (I l) from scavenge tube (7). Remove and disciud gasket (I 0). (6) Disconnect and remove transmission breather tube (33) from elbow (34 ). (7) Remove elbow (34) from right bank ejector tube (4) and transmission. (8) Remove l 1 machi ne screws (l ), plain nuts (31), lockwashers (30), and flat washers (2). (9) Remove and discard insulators (3 and 32). 4-15. Cleaning. Refer to paragraph 3-36. 4-16. Inspection and Repair. a. Refer to paragraphs 3-37 and 3-38 for general inspection and repair. b. Inspect tubes (7, 14, 20, 25, 33, and 41, fig. 4- J 8) for erosion, cracks, broken welds, and damaged nanges. Jnspect welded brcatber tube Oil Jeft ejector tube (28), transmission breather tube Change 3 4-11