TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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6-60. Overhaul of Fuel Injection Pump Fuel Tubes, Fuel Return Hoses, and Nozzle Fuel Return Tubes a. Disassembly. The fuel injection pump fuel tubes and nozzle return fuel return tubes were disassembled during disassembly of engine, Chapter 5. b. Cleaning, Inspection, and Repair. Refer to paragraphs 6-2 through 6-4. (1) Fuel Injection Pump Fuel Tubes. Flush the fuel tube assemblies with a high pressure flushing device. After flushing, blow dry with compressed air and plug tube ends with plugs or caps to assure cleanliness. Inspect tubes for correct inside diameter hole dimension. The correct inside dimension is 0.084-inch. Tubes with larger or smaller hole diameter are to be discarded. On original production engines, fuel tubes were hand formed from straight tubes. Carefully inspect all tubes for proper con- figuration using a current preformed tube of like function for comparison. Excessive bending or hand forming creates high stress points and greatly reduces tube life. Discard any tube that Figure 6-248. Comparison of serviceable deviates from preformed comparison tube original production and improvised configuration. Inspect tube assemblies for design sleeves-fuel injection cracks, splits or kinks and for defective safety pump tube ends. sleeve nut and sleeves. Refer to figures 6-248 and 6-249 for comparison of original production and improvised design sleeve fittings shown in serviceable and unserviceable condition. Straighten minor bends in tubing when possible. Discard entire tube assembly if fittings are damaged or tubing has been kinked. 6-210