TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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a light film of OE engine oil or GAA grease to studs, bolt threads, capscrew threads, and contact face of nuts, bolt heads, and capscrew heads. Avoid excessive amounts of lubricant in blind tapped holes. All hardware must be torque tightened to specified limits. When a torque v<1lu is not specified in the text or 011 an illustration, refer to Standard Torque Values, paragraph 3-41. Special torque values are specified in the text and/or illustrations. Refer also lo Special Torque Values, paragraph 3-41. TM 9-2815-220-34 NOTE Do not vary from torque specified. Under- torquing will result in premature failure of studs and bolts. Overtorquing can re- sult in yielding of bolts and studs. d. Safety Devices. Dolts and nuts must be secured wilh lock washers, lock nuts, tab washers, locking wire or cotter pins, when specified . e. Removal and installation procedures for the I Models AVDS-l790-2CA and AVDS-l 790-2DA are the same as those listed r the Models AVDS-l 790-2C and AVDS-1790-20 respectively with the exception of the Clean Air Package which js covered in Chapter 4. Section IV. REMOVAL AND INSTALLATION OF ENGINE ACCESSORIES I 2-16. General This section covers the replacement and proper procedure and instructions for the removal and installation of any one of the engine accesso1ies. 2-17. Fuel Pump (Models AVDS-1790-2C and AVDS-1790-20) a. Removal. (1) Disconnect fuel outlet hose (1, fig. 2-9) from pump outlet adapter. Collect fuel in a suitable con- tainer and discard. Disconnect fuel pump inlet tube nuts (2). Remove two machine screws, lockwashers and one flat washer (3) and pull backf1ow valve away from bracket as necessary and remove fuel inlet t ube. (2) Remove fuel pump outlet adapter (4) and fuel inlet connector (5) from fuel pump. Retain adapter and connector for installation in replace- ment pump. (3) Remove four self-locking nuts and flat washers (6) and remove fuel pump from pump adapter. Remove and discard fuel pump mounting gasket. b. Installation. NOTE Pump replacement will be made with en- gine Fuel Pump Kit, Refer to TM 9-2910- 213-34. (1) Position fuel pump mounting gasket on studs and position fuel pump on pump adapter. Be sure fuel pump shaft splines are properly alined with drive coupling before securing pump to pump adapter. Install four-self-locking nuts (6, fig. 2-9) and flat washers securing pump to adapter. (2) Install fuel inlet connector (5) and fuel pump outlet adapter (4) in fuel pump. I (3) Position fuel inl et tube between back- flow valve and fuel pump. Loosely instalJ two screws, lochvashers and one Oat washer (3) secur- ing backf1ow valve to mounting bracket. Connect fuel inlet tube nuts (2) lo backflow valve and fuel I p ump . Tighten two screws (3) and connect fuel outlet hose (I) to pump outlet adapter. NOTE Open bleeder val ve on fuel/water separator filter and purge fuel system (para 2-23). Close bleeder valve after purg- ing system. � ( FUEL. PUMP ADAPTER I Fuel outlet hose 2 uel pump inlet tube nul 3 Screw, lockwashcr 4 Fuel rump outlet adapter 5 Fuel nlel connector 6 Self-locking nut Figure �·9. Re111u11i11g or i11talfi11gfuel pump, mo<fol A VDS-1790-iC a11d A\ 'DS-1790-flD e11giMs. Change 3 2-33