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

TM 9·2815-220-34 I Nozzle body 2 Sea I spacer 3 Shim 4 Upper spring 3l S Preformed packing 6 Nozzle retainer 7 Preformed packing 7.1 Preformed packing 8 pnut 9 Nozzle assembly I 0 Fial washer (gasket) 11 Nonie body 12 Nozzle valve 13 Nozzle spacer 14 Lower spring scat 15 Nozzle spring 16 Retainer spring 17 Tube connector gure 2-133. el injeeror noule and holder embly - exploded vie. d. Cleaning. NOTE Do not use sharp tools, wire brushes or abrasive materials to clean the nozzle or nozzle by. (1) Clean Fuel Injector Nozzle Assembly. Soak nozzle body in carbon removing solvent to remove major carbon deposits. Remaining carbon deposits should be removed using a soft cloth or felt pad and mutton tallow. A piece of soft wꝏd, soaked in oil may also be used as a carbon remover. (2) Clean Nozzle Spray OrificeJ. Remove carbon from the orifices of the nozzle by by soaking nozzle body in a carbon removing solvent only. Do not clean orifices with cleaning wire as this method will distort nozzle orifices and also may blk opening due to wire breakage. (3) Clean Fuel Injector Holder and Assiated PartJ. Clean all parts thoroughly. Be sure hands are kept free from accumulation of grease which will cause collection of dust and grit on parts. Cover or wrap all parts after cleaning to protect them from dirt accumulation. e. Inspection. (1) Inspect Nozzle By and Valve. Inspect seat 2-84 Change 3 of nozzle valve (12, fig. 2-133} for evidence of wear, distortion of the valve seat due to pounding, discoloration due to overheating, and pitting. Inspect the valve stem for scratches and discoloration. Check fit of valve in nozzle by (11} by lifting the valve about one-third of its length out of the body. The valve should slide back to its seat without aid when the assembly is held at a - degree angle. Inspect the eight spray orifices in the nozzle body tip and the drilled passage in the body for freedom of ob- structions. Inspect lapped sealing surfaces of valve body for cracks, scratches, discoloration, wear, pit· ting and evidence of pounding. (2) ltl$pect Nozzle Spacer. Inspect the lapped sealing surfaces on the ends of the nozzle spacer (13) for scratches, discoloration, and cracks. Inspect the area around the center hole on the nozzle end for evidence of wear and pounding by the valve nozzle by. Maximum allowable depth of wear of pounding at this area is 0.3-inch. Inspect drilled passages in spacer for obstructions. (3) Tnspect Nozzle and Retainer Springs, Spring Seats and Shims. Inspect the nozzle spring (15) for cracks and evidence of wear. Inspect retainer spring (16) for cracks, and for evidence of discoloration due  excessive heat. Free length of retainer spring must be 1.403 to 1.409-inch. Inspect upper and lower spring seats (4) and (14), shims (3) and seat spacer (2) for cracks, scratches, and evidence of pounding. (4) Tnspect Nozzle Body and Retainer. Inspect the nozzle by (1) and nozzle retainer (6) for cracks, burrs, nicks, and raised metal. Inspect sealing sur- faces for scratches and discoloration. Inspect threaded areas and tapped openings for stripped o r damaged threads. (5) Tmpect Nozzle Cap11ut and Tube Con;1ector. Inspect the nozzle capnut{8) and tube connector (17) I for nicks, bur, raised metal surfaces, and cracks. Jn. spect threaded area inside capnut for stripped or damaged threads. Inspect the gasket area on end of capnut for deep scratches. f Repair. I (1) Replace nozzle assembly (9) when by seat or valve seat is badly worn, pounded, or pitted, or when nozzle body orifices are clogged. Replace nozzle assembly when lapped sealing surfaces are nicked, scratched or cracked. (2) Repair of the remaining nozzle components is limited to cleaning up threads on the nozzle body (1), nozzle retainer (6) and capnut (8). It is not practical I to attempt repairs to any of the remaining parts. If inspect. ion revealed damage to any of the remaining parts, replace the complete nozzle and holder assem- bly. g. Assembly.