TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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the disassembly of the engine into subassemblies. Chapter 6 gives information for cleaning, in- spection, handling of parts and general repair procedures including overhaul standards, and the disassembly and assembly of the various engine subassemblies and components. d. Chapter 7. This chapter covers the assembly of the engine from subassemblies, and provides pertinent assembly information peculiar to the engine, including installation of accessories. e. Chapter 8. This chapter outlines the test and adjustment procedures required to insure that an engine has been properly repaired. Also included in this chapter is the information relating to the engine container. Complete in- structions concerning the removal or installation of the engine, repair of the container and engine preservation and storage have been covered. f. Appendixes and Indexes. ( 1 ) Following Chapter 8 is an alphabetical index for maintenance services outlined in the manual. This index provides a rapid reference to a paragraph and figure in accordance with the subject operation. (2) Appendix A provides a list of publications which are related to the materiel or its maintenance. (3) Appendix B contains an introduction, a list of parts and special tools, and a Federal Stock Number index. (4) At the back of Appendix B of the manual are fold-out illustrations which provide rapid reference for repair parts identification. These illustrations are numerically keyed to the items in the repair parts text, and also include alphabetical keys for points of measurement for the maintenance manual overhaul standards. 1-4. Organizational, Direct Support, General Support, and Depot Maintenance Allocation Refer to the pertinent maintenance allocation chart in the Organizational Maintenance Manuals (para 1-2). 1-5. Forms, Records and Reports For listings of all authorized forms, refer to the current issue of DA PAM 310-2. TM 38-750 contains instructions on the use of forms for records and reports. Authorized forms for units maintaining this materiel are listed in Appendix A. Section II — DESCRIPTION 1-6. Differences Between Engine Models a. Engineering improvements were developed on the AVDS-1790 series engines to improve engine performance and reliability. b. The following engine models are available in the field : ( 1 ) AVDS-1790-2-M. This original AVDS- 1790 series engine developed for the M60 vehicle had engine oil pan, Part No. 10865039. In order to use the engine in other vehicles, the oil pan had to be redesigned. Because engine interchangeability was affected it was necessary to change the engine model when the new oil pan was installed on the engine. AVDS-1790-2-M engines with the new oil pan are identified as AVDS-1790-2-AM models. (2) AVDS-1790-2-AM. This was an original AVDS-1790 series engine with a new engine oil pan, Part No. 10912261, which permitted the engine to be used as a replacement engine in certain gasoline engine powered vehicles. The oil pan change was the only dif- ference between this engine model and the AVDS-1790-2-M model. (3) AVDS-1790-2A. The AVDS-1790 series engines, having the new oil pan and numerous other changes to improve engine performance and reliability, is identified as the AVDS-1790-2A model. Basically all models of the engine are similar except for the oil pan, and other improvements which are as follows: (a) Secondary fuel / water separator filter unit (fig. 1-6) replaced the conventional dual replaceable element type filter (fig. 1-3) in late production. All engines produced with secondary fuel filter shall be updated to water separator filter unit at time of engine overhaul. (b) Relocated oil temperature and pressure transmitters and switches to the front of the engine for ease of maintenance. (c) Optional splined or diaphragm type fuel injection pump drive coupling. (d) Flexible fuel injector nozzle fuel return lines replaced rigid steel tubes to improve service life. 1-2