TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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2-41. Fuel Injection Pump Drive Coupling a. Removal. - . (1) Remove cooling fan vanes, cooling fans, en- gme upper covers and cooling fan shroud. Refer to paragraph 2-2la. (2) Remove fuel injector tube clamps and tubes. Refer to paragraph 2-2la. (3) Disconnect electrical lead, oil inlet hose fuel inlet hose, fuel retu hose, and remove ' f ue l injection pump. Refer to paragraph 2-2 la. (5) Remove fuel injection pump coupling sleeve and hub from injection pump. Refer to paragraph 2-21a. Figw·e 2·118. RemQving ur i11stalli11g/11elinjectio11 pump c111tpli11gj'rcm1 gcarshaft. (6) Remove plain nut and lockwasher (fig. 2-118) attaching fuel injection pump drive coupling half to fuel injection pump spur gearshaft. Remove coupling sleeve splined hub and key using impro- vised puller (fig. 2-2). b. Installation. (1) Position key, splined hub, and fuel injection TM 9-2815-220-34 pump coupling sleeve (fig. 2-118) on ruel injection pump spur gearshaft and install lockwasher and plain nut. Torque tighten nut to 900 pound-inches. (2) Install injection pump coupling on fuei in- jection pu;np (para 2-21b). (3) Set fuel injection pump and engine timing, and install fuel injection pump on engine (para 2-21bJ. ( 4) I nstal I fuel injector tubes, clamps and check for fuel leaks (para 2-21b). (5) Install cooling fan shroud, engine upper covers, cooling fans and cooling fan vanes (para 2-2lb). 2-42. Manifold Heater or Ignition Unit WARNING The ignition units on this engine are cap- able of producing extremely high voltage. The output of this ignition system is suffi- cient to cause a dangerous electrical shock. Never touch any uncovered or live connections. NOTE The heater and ignition unit on each side of the engine are removed in the same manner. For instructional purposes re- moval of the left heater and ignition unit is described in the following instructions. a. Removal. (1) Ignition Unit. (a) Disconnect manifold heater electrical lead (1, fig 2-1 19) and wiring hness el ect cal lead (2) from ignition unit (4). (b) Loosen two machine screws (3) and re- move ignition unit (4) from clamps. (2) Manifold Heater. (a) Disconnect electrical lead (1, fig. 2-119) at spark plug. Disconnect manifold air heater fuel inlet hose from elbow (5) and disconnect manifold air heater fuel return tube (6). (b) Remove four self-locking nuts and flat washers (7) and remove manifold heater assembly (8). Remove and discard gasket (9). b. Installation. (1) Manifold Heater. (a) Install manifold heater (8, fig. 2-119) on heater tube using new gasket (9), and secure to heater tube with four self-locking nuts and flat washers (7). (b) Connect manifold air heater fuel retu Change 3 2·77