TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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a. Turbosupercharger Base, Supports, and Tie Rods. Refer to figures 5-81 through 5-79. b. Fuel Inlet and Return Hoses and Crank- case Breather Tubes. Refer to figures 5-77 through 5-71. c. Exhaust Pipes and Manifolds. Refer to figures 5-78 and 5-70 through 5-68. d. Fuel Injector Clamps, Supports, and Tubes. Refer to figures 5-67 through 5-64 and 4-86, and (1) through (6), below. (1) Fuel tubes should be installed in- dividually and in the sequence listed below to assure adequate wrench clearance. Beginning with the left bank fuel injector tubes (rear pump head) install tubes for cylinders 5, 3, 1, 6, 2, and 4 in that order. Install the right bank tubes for cylinders 2, 4, 1, 6, 5, and 3 in that order. Note. Injector tubes for cylinders 1, 2, and 3 right bank, must be routed under the right exhaust manifold between cylinders 2R and 3R exhaust port manifold connections. (2) Special precautions must be taken to ensure that all tube connections to a given in- jection pump port, terminates at the proper cylinder (figure 4-86). Current replacement fuel injector tubes have identification tags at each end to assure proper injection pump port con- nection and cylinder nozzle connection. In- correct hook up of the injector tubes to a wrong cylinder or injection pump connection would result in damage to the piston rings and cylinder walls and severe damage to the engine if operated under full load. (3) Check the alignment of each tube with its mating fitting. It may be necessary to bend the tube(s) to gain alignment. The tube MUST be aligned in its free state before attempting to engage the fittings, to minimize unwanted stresses. (4) Start fittings on both ends by hand until the sleeve is seated. If a wrench is required, only low torques are necessary to seat the sleeve. When the sleeve is seated, an increase in torque will be quite evident. When this point is reached, draw the nut (each end) up approximately 1 / 6 of a turn (minimum), but not more than 1 / 3 of a turn (maximum), to complete the tightening operation. Note. Overtightening will damage the sleeve and cause fuel leaks. (5) NEVER OVER TIGHTEN when attempting to remedy a fuel leak. Overtightening will deform the sleeve and eventually lead to tube failure. It is permissible to loosen the nut, or fitting, and re-tighten. This procedure will, in many cases, seal the fuel leak. The loosening and tightening operation tends to re-seat the sleeve, thus providing an effective seal. Replace fittings and / or tubes rather than overtighten to stop leaks. (6) The proper installation and positioning of the tube clamps is essential to ensure tube lift. Install all stationary clamps as shown in figure 7- 31. The floating clamps, i.e., the four clamps located nearest the pump head, must be positioned as specified to ensure maximum vibration dampening. The two floating clamps on the right bank each support three tubes. Similar clamps on the left bank support only two tubes, i.e., tube No’s. 1 and 2, and 5 and 6. 7-24