TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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I TM 9-2815-220-34 NOZZLE ATTACHING TUBE Figure 2-132. TNting / injector taonlc atad holder asembly. (5) Check Nozzle Claatter. The chatter test requires that one stroke of the tester handle takes ap- proximately two seconds, with pressure gage valve closed. Chatter must be distinct and regular. A sharp pitch sound is not mandatory, and an casional skip or variation in chatter pitch is acceptable. When noz- zle chatter is not satisfactory, and dœs not improve with continued operation of the tester, the nozzle must be replaced. c. Disassembly. CAUTION It is of utmost importance that the work area be clean and free from dust. Proper repair of nozzles is dependent primarily on cleanliness. NOTE . Preformed packing (7 and 7.1 fig. 2-133) and gasket (10) were removed and dis- carded in paragraph 2-3, (6). (1) Remove nozzle tube connector (17, fig. 2-133), ·pnut (8), retainer spring (16), fuel I injector nozzle assembly (9), with nozzle body (11) and nozzle valve (12), nozzle spacer (13) and retainer (6 ). · (2) Remove lower spring seat (14), nozzle ad- justing spring (15), upper spring seat (4), shims (3) and seat spacer (2) from nozzle body (1). Remove and discard preformed packing (5). Note the number of shims (3) removed. (3) Remove nozzle valve (12) from by (11). It may be necessary to soak the nozzle assembly in car- bon removing solvent to aid in disassembly. NOTE The nozzle body and nozzle valve were fit- ted individually during manufacture to form a mated assembly and parts are not interchangeable between nozzles. Care must be taken during the cleaning, in- spection and repair operations to keep these parts together. Change 3 2-83