TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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TM9-2815-202-34 4-40. FUEL INJECTOR ASSEMBLY REPAIR (Cont) f. Testing NOTE Injectors that were disassembled must pass all tests outlined below prior to installation in engine. Injectors which were removed from engine should be checked prior to any disassembly to avoid unnecessary repair. (1) Injector control rack freeness (a) (b) (c) (d) (e) Place injector in fixture (36). Hold injector control rack (24) in NO FUEL position. (Rack all the way extended). Using handle, depress follower to bottom of its stroke. Slowly release pressure on handle while moving control rack in and out until follower reaches top of its travel. Injector passes test if rack falls freely. If rack binds, loosen injector nut, turn tip, and then torque nut to 80 Ib-ft (108 N-m) for blued components, 50 Ib-ft (68 N-m) for nonblued components, or 65 Ib-ft (88 N-m) for mixed components. Loosen and torque nut a couple of times if necessary. If rack still binds, change injector nut. Finally, if rack binds, disassemble injector to eliminate cause of misaligned parts or to remove dirt. (2) Spray tip concentricity (a) (b) (c) (d) Place injector in fixture (36). Adjust dial indicator (37) to zero. Rotate injector 360 degrees and note total runout as indicated on dial. If total runout exceeds 0.008 inch, remove injector from fixture. Loosen injector nut, center spray tip, and retorque nut. Recheck sprav tip concentricity. If, after several attempts, spray tip cannot be positioned satisfactorily, replace injector nut. 4-232 Change 1