TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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of each valve (8). Disconnect two outlet hoses (9) from two fittings on side of mounting bracket (7.). Disconnect two outlet hoses (9) from bottom fit- ting on each valve. Remove outlet hoses. Loosen locking nut (10) on each valve and slide valves out of mounting bracket. (3) On AVDS-1790-2DR only, remove oi l sampling valve from front of oil filter housing cover (fig. 1-7.3). b. Jnslallalion. ( l ) Install mounting bracket in a vise, and instaU the valves as shown in figure 2-148.11, with the hanclJes and the inlet ports facing opposite each other and p�m11lel to bottom flanges of mounting bracket. Secure both valves in mounting bracket by tightening jam nut while holding a wrench on nut directly beltind bracket wall. (2) Connect outlet hoses to valves (fig. 2-148.11). Connect opposite ends of two outlet hoses to fittings on mounting bracket side flange. (3) Attach engine oil inlet line (fig. 2-148.11) to left valve. Attach transmission oil inlet line to right valve. (4) Remove oil sampling valve assembly from vise and secure to right rear upper cover with two assembled washe1· bolts (6, fig. 2-148.10). (5) Attach transnussion oil inlet line (3) to adapter (4). Attach enne oil inlet line (2) to tee (1 ). Secure both inlet lines to right upper covers with four assembled washer bolts and loop cJamps (5). TM 9-2815-220-34 (6) On Model AVDS-1790-2DR only, il1StaJl I one oil sampling toggle valve to oil filter housing front cover (fig. 1-7.3) . TA265734 I Figure 2·148. J 1. Removing or i11stol/i11g o sampling valves I in bracket 2-49.5. Clean Air System I Refer to Chapter 4 for removal and installation pro- cedur for the clean system on 1nodels AVDS-l 790-2CA and AVDS-J 790-2DA. Section VI. SERVICE OPERATIONS 2-50. General This section covers service operations allocated to the Direct Support and General Support Mainte- nance Organization. Procedures outlined in this section are for service operations requiring a minimum of engine disassembly to perform. 2-51. Checking Cylinder Compression a. General. For instructional purposes in this section all fuel injector nozzle and holder as- semblies will be removed and a compression test will be made on all cylinders. WARNING It is recommended that all nozzles be re- moved when performing a compression check. Nozzle removal will prev ent the possibility of the en gine firing on other cylinders when the engine is cranked, and will permit the engine to be cranked at the desired RPM to check compression. b. Stwrting engine. Check the vehicle batteries to assure a ful l charge, and replace if necessary. Refe to the pertinent operator's manual r en- gine starting procedures. Start engine and allow engine to reach normal operating temperature and then stop engine. Cut off fuel supply so engine will not deliver fuel while perforntlng-compression test. NOTE Compression testing must be performed with- in an hour after stopping the engine. c. Disassembly. (1) Remove cooling fan vanes, coo)jng fans, engine upper covers, cooling fan shroud, and fuel injector tubes, refer to paragraph 2-2 la. (2) Remove fuel injector nozzle and holder assemblies, refer to paragraph 2-3. d. Compress;o11 Test. (1) Position new injector nozzle gasket (fig. 2-149) on end of compression adapter, Part No. 8743025. Apply a light coating of grease on gasket so it adheres to adapter when installed in cylinder. (2) Install adapter into fuel injector nozzle holder opening and tighten securely using crowfoot attachment, Part No. I 2254244. (3) lnstall gage assembly, Part No. I 0899180 (fig. 2-150) on adapter, Part No. 8743025 and Change 3 2·95