TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Disassemble 1. Remove fuel injector nozzle assembly (K), with nozzle body (K-1) and nozzle valve (K-2) from valve stop spacer (L). 2. Remove valve stop spacer (L) and nozzle opening pressure adjusting spring (N) with spring upper and lower seats (D and M) from holder body (A). Do not remove the spring adjusting upper and lower spacers ( B and C) from spring upper seat (D) unless ajustment of the nozzle opening pressure is necessary during testing of the fuel injector nozzle and holder assembly ( para 4- 17). 3. Remove and discard preformed packing (E) from holder body (A). 4. Disassemble fuel injector nozzle assembly (K) by removing nozzle body (K-1). It may be necessary to soak the nozzle assembly in carbon removing solvent to aid in disassembly. It may be necessary to tap nozzle body downward on the edge of a wooden bench or other similarly soft surface to remove valve. Note. The nozzle body and nozzle valve are fitted individually during manufacture to form a mated assembly. Individual parts are not in- terchangeable. Therefore, extreme care must be taken during the cleaning, inspection, and repair operations to keep these parts mated. Assemble Note. During assembly, the addition or removal of spring adjusting spacers to obtain the correct gage pressure reading on the nozzle tester may require various combinations of spacers available in shim set -5365-235-1941. Although each nozzle assembly pressure reading may vary, experience will indicate the approximate spacer thickness or combination of spacer thickness required to make up pressure differences. The nozzle assembly must be completely assembled, torque tightened and checked again on the nozzle tester to assure proper spacer combination and pressure reading. This procedure may have to be repeated several times before achieving a satisfactory reading. 1. Assemble nozzle valve (K-2) in nozzle body (K-1) to form fuel injector nozzle assembly. 2. Install a new preformed packing (E) in holder body (A). 3. Install spring upper seat (D), with spring adjusting upper and lower spacers (D and M) in end of nozzle opening pressure adjusting spring (N). Install spring lower seat (M) in opposite end of spring (N) and install assembled spring and valve stop spacer (L) in holder body (A). 4. Install fuel injector nozzle assembly (K-1 and K-2) in valve stop spacer (L). Figure 4-170. Disassembling or assembling fuel injector nozzle components. 4-85