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

Page 162 of 532

TM 9-2815-220-34 b. lnstallatfon. (1) Install as a unit, the purge pump and fuel heater tube tee, (8, fig. 2-129), reducer (9), filter (10). and elbow (11). Install fuel inlet hose adapte1· (7) and fuel pump tube adapter (6). (2) Position back flow valve (5) on mounting bracket (12) and fuel pump inlet tube (3) and secure backnow valve with two screws, lock- washe, one flat washer and one clip (4). Connect fuel pump fuel inlet tube (3), manifold heater fuel line (2) and fuel inlet hose( ! ). 2-47.1. Fuel Backflow Valve (Model AVDS· 1790·2DR) a. Removal. ( l) Disconnect fuel inlet hose (I, fig. 2-J 29.l) and drain fuel into a suitable container. Disconnect manffold heater fuel line (2) and I backriow valve outlet hose (3). Remove two screws, lock washers and flat washers (4) and remove backflow valve from mounting bracket. I I I Inlet i iose 2 Mani fold hcater fuel lmc 3 Fud inlet t11be 4 Screw and \1nsher 5 Blcknow \:the 6 Tube ndoptcr , 7 lnlel hose adapter 8 Tee 9 Reducer 10 Filter 11 Elbow 12 lounling bracket Figure 2-129. Rr11101•i11g or i11s1ulli11g fuel barkflow lil•e, model A VDS-1 790-2C and A l'DS-l 70-2D .11g111es. (2) Remove and retain for installation in the replacement backnow valve, the fuel pump hose adapter (5) and fuel inlet hose adapter (6). Remove and retain the purge pump and fuel heater lube tee (7), and bushing (8). b. !11stallation. (J) Tnstall bushing (8, fig. 2-129.l), and tee I (7) 011 new backflow valve. Install fuel inlet hose adapter (6) and hose adapter (5) in backnow valve. 2-82 Change 3 (2) Install backflow valve on mounting I bracket and secure with two flat washers, lock- ( washers and screws (4). Connect check valve outlet hose (3) and manild heater fuel Line (2). Connect fuel inlet hose ( l ). 2-48. Replacement and/or Repair of Fuel In- jector Nozzle and Holder Assembly. a. Removal. (1) Remove cooling fan vanes, cooling fans, fan shroud, and engine upper covers. Refer to para- graph 2-21u. (2)Remove fuel injector lines an<l fuel injector nozzle and holder assemblies. Refer to paragraph 2-21a and 2-30?. (3) The fuel injector nozzle and holder as- semblies are generally remoed while trouble- shooting the fuel system, particularly when a fuel injection pump has failed. The nozzles should be tested on a nozle tester for opening p1·essure, spray pattern, leakage and nozzle chatter before reinstalling in engine. Check the nozzle retaining I Fuel inlet hose 2 Manifold heater rucl line 3 Backflow valve outlet hose 4 Screw. lockwashcr and flat washer 5 Mose adapter 6 Hose adapter 7 Tube tee 8 Bushing Fure 2-129.1. Re11101•i11g or i+stal11g fuel bock/10111 1·0e, model A DS·l 790-2DR e11gi11e.