TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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(para 8-4) and cannot be found through visual inspection. Perform test as directed in b through d, below. b. Remove Cooling Fan Vanes and Cooling Fans. Remove cooling fan vanes and cooling fans (figs. 4-34 and 4-35). c. Install Sleeve Spacers. Install two fan rotor hub sleeve spacers - 4910-795-7952 (fig. 4-87). d. Test for oil and Fuel Leakage. (1) Start engine and check for oil and fuel leaks at hoses, tubes, and all connections inside engine “V” and around engine. Tighten hose connections or replace leaking hoses, elbows, tee, and nipples as necessary to correct oil or fuel leaks. Note. Slide fuel injection tube, dust caps (C, fig. 4-87) away from tube connections at fuel injection pump to check for fuel leaks. Note. DO NOT run engine above idle speed, and DO NOT apply load to engine. (2) Refer to troubleshooting (paras 3-1 through 3-11) for probable causes and corrections for other possible leakage points around engine. (3) When all points for oil and fuel leaks have been inspected and / or corrected, remove fan rotor hub sleeve spacers - 4910-795-7952 (fig. 4-87). e. Install Cooling Fans. Install engine cooling fans (fig. 4-35). f. Check Cooling Fan Blade Clearance. Check fan blade clearance following instructions accompanying figure 4-88. g. Install Cooling Fan Vanes. Install cooling fan vanes (fig. 4-34). 8-4. Engine Run-in a. General. This paragraph describes run-in schedules for overhauled engines prior to being placed in service. Engine run-in is performed af- ter overhaul to assist in breaking-in new parts, to detect faulty assembly. to check for oil leaks, and to determine whether an engine will operate satisfactorily when installed in vehicle. b. Preparation for Run-in. (1) Couple engine to suitable load. The load may be a water brake or electric dynamometer. (2) Remove engine right and left rear upper covers (figs. 4-127 and 4-141). Remove pipe plugs from each bank and attach thermocouples to exhaust manifolds. Reinstall upper covers. (3) Attach C0 2 fire extinguisher (fig. 8-1). (4) Remove pipe plug from secondary fuel filter or pipe plug from fuel/ water separator (fig. 8-1). (5) Remove pipe plug (B, fig. 6-6) and attach piston oil sprayer pressure gage or con- nection. (6) Install oil fitting in oil pan. (7) Remove main oil gallery pipe plug (fig. 8-1) and install main oil gallery thermocouple. (8) Install main oil gallery pressure con- nector or attach to oil pressure sending unit (fig. 8-1). (9) Attach oil inlet and outlet lines to crankshaft damper housing if external oil cir- culating system is to be used. If engine is not to be run on a circulating oil system, lubricate engine by forcing engine oil under pressure into the lubrication system to assure adequate lubrication of engine parts until the engine oil pump has time to circulate oil. Fill engine oil pan with proper grade oil to fill mark on oil level gage. (10) Attach fuel inlet line to primary fuel filter (fig. 8-1). (11) Attach fuel return line, flywheel end (fig. 8-2). (12) Attach turbosupercharger induction air inlet (fig. 8-1) and exhaust outlet tubes (fig. 8-2). Connect same type air cleaners that are used with engine installed in vehicle. (Refer to ap- plicable Vehicle Technical Manual.) Air intake should be located so that only cool, fresh air will be inducated into engine. A means must be provided for conducting exhaust gases and cooling air from engine to avoid recirculation through engine cooling fans. (13) Install thermocouple in intake manifold elbow, both banks (fig. 8-1). (14) Install manifold pressure gages or connections in intake manifold elbows (fig. 8-1), both banks, set manometers to current wet barometer reading. (15) Attach fuel shutoff connection, damper end, and ascertain to be operative (fig. 8-1). (16) Turn on oil circulating pump and fuel supply purge pump. (a) When fuel flows from secondary fuel filter or fuel / water separator pipe plug hole, air has been removed from fuel system. Attach fuel pressure gage or connection at pipe plug hole. (b) Oil circulation is checked by loosening the externally-relieved body bolt (fig. 8-1) on No. 8-3