1、Comments, suggestions, or questions on this document should be addressed to U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000 or emailed to DAMI_STANDARDIZATIONconus.army.mil. Since contact in
2、formation can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. AMSC N/A FSC 2815 INCH-POUND MIL-DTL-46796D 10 March 2010 SUPERSEDING MIL-DTL-46796C 30 September 1998 DETAIL SPECIFICATION ENGINE, DIESEL: 8 CYLINDER
3、, V-TYPE 390 TO 440 H.P. This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers several 8 cylinder, V-type, liquid-cooled, 2-stroke-cycle, turbo-supercharged, internal-combustion, compression ignition engines
4、 for use in military vehicles (see 6.1). The basic design of these engines is very similar and the characteristic differences have been classed as Type I or Type II for the lower or the higher power versions. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in
5、sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they mus
6、t meet all specified requirement documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks, form a part of this document to the extent spe
7、cified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-46796D 2 FEDERAL SPECIFICATIONS A-A-52624 - Antifreeze, Multi-
8、Engine Type. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-2104 - Lubricating Oil, Internal Combustion Engine, Combat/Tactical Service. MIL-DTL-46162 - Fuel, Diesel, Referee Grade. MIL-PRF-46167 - Lubricating Oil, Internal Combustion Engine, Arctic. MIL-A-53009 - Additive, Antifreeze Extender, Liquid
9、 Cooling Systems. MIL-PRF-62048 - Air Cleaners, Automotive: Heavy Duty, Dry-Type (For Internal-Combustion Engines) (Metric). (Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from the Document Automation and Production Service, Building 4/D, 700
10、Robbins Avenue, Philadelphia, PA 19111-5094 or https:/assist.daps.dla.mil/quicksearch/.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this specification to the extent specified herein. Unless otherwi
11、se specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). DEPARTMENT OF DEFENSE DRAWINGS 11669155 - Engine Assembly (TYPE I). 12260210 - Engine Assembly (TYPE I). 12268500 - Engine Assembly, Low Heat Rejection (TYPE II). (Copies of these documents are ava
12、ilable from DAMI_STANDARDIZATIONconus.army.mil or U.S. Army RDECOM, Tank Automotive Research, Development and Engineering Center, ATTN: RDTA-EN/STND/TRANS MS #268, 6501 E. 11 Mile Road, Warren, MI 48397-5000.) 2.3 Non-Government publications. The following document(s) form a part of this document to
13、 the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) ANSI/ASQC Z1.4 - Sampling Procedures and Tables for Inspections by Attributes (DoD Adopted). (Applications f
14、or copies should be addressed to The American National Standards Institute, 11 w 42nd Street, 13th Floor, New York, NY 10036. (or http:/www.ansi.org) or American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203 (or http:/www.asq.org/).) Provided by IHSNot for ResaleNo reproducti
15、on or networking permitted without license from IHS-,-,-MIL-DTL-46796D 3 AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D975 - Standard Specification for Diesel Fuel Oils. (Application for copies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, We
16、st Conshohocken, PA 19248-2959 or http:/www.astm.org.) NATO INTERNATIONAL STAFF - DEFENSE SUPPORT DIVISION NATO AEP 5 - NATO Standard Diesel and Spark Ignition Engines Laboratory Test. (Application for copies should be addressed to NATO, Military Agency for Standardization (MAS), 35 Chesham Place, L
17、ondon SWI, England or http:/nsa.nato.int/nsa/.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a sp
18、ecific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a first article sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Materials. Unless specified herein, materials used shall be in accordance with the manufacturers material
19、s specifications for 390 to 440 horsepower (hp) diesel engines. The materials shall be capable of meeting all of the operational and environmental requirements specified herein (see 4.6.1). Recovered materials shall be used to the maximum extent practicable. 3.2.1 Metals. All metals used in the cons
20、truction of the engines shall be of a corrosion resistant type or shall be suitably protected to resist corrosion during the normal service life of the engines. The use of dissimilar metals in intimate metal to metal contact shall be avoided. 3.3 Environmental requirements. The engine shall start wi
21、thin 2 minutes and shall demonstrate the performance characteristics specified herein under any of the following conditions or possible combination of conditions (see 4.6.3). 3.3.1 Temperature start conditions. 3.3.1.1 Low temperature start without external aids. With integral cold starting aid and
22、without external aids after being cold soaked, without benefit of solar radiation, to an ambient temperature of -25 degrees Fahrenheit (F) (-31.6 degrees Celsius (C) (see 4.6.3.1.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-46796D 4 3.
23、3.1.2 High temperature start without aids. Without external aids, with cooling fan installed, and a fuel pressure of 5 pounds per square inch (psi) (34 kilopascals (kPa) at the inlet to the fuel injector supply pumps, when operated at the following temperatures with exposure to maximum solar radiati
24、on (see 4.6.3.1.2): Ambient air temperature 115F (46.1C) Intake air temperature 115F (46.1C) (at air cleaner inlet) Coolant outlet temperature NTE 230F (110C) Oil sump temperature Maximum temperature attainable up to 275F (135C) 3.3.2 Elevation conditions. The engine shall have adequate torque and p
25、ower requirements at any elevation from sea level to 8000 feet (ft) (2438 meters (m), except that the power requirements of the engine shall be reduced proportional to the elevation. At 8000 ft (2438 m) elevation, the observed power output of the engine shall be not less than 90 percent (%) of rated
26、 power (see 4.6.4). 3.3.3 Humidity conditions. The engine shall perform under relative humidity conditions as low as 5 percent at a temperature of 115F (46.1C) and as high as 100 % at all temperatures from -25 to 85F (-31.6 to 29.4C) (see 4.6.5). 3.4 Design and construction. The engine construction
27、and assembly shall be in accordance with Drawings 11669155, 12260210 or 12268500 (see 4.6.2). 3.4.1 Electrical accessories and equipment. Unless otherwise specified (see 6.2), all electrical accessories and equipment, including the glow plug cold starting system, wiring and electrical connections, s
28、hall be installed on the engine and properly adjusted (see 4.6.6). 3.4.2 Interchangeability. Component assemblies and parts of the engine shall be constructed in such a way that any part, except those furnished in matched sets or for which a selective fit is specified, may be installed, replaced, an
29、d adjusted without requiring modification (see 4.6.7). 3.4.3 Air cleaner. The air cleaner required for use with the engine, shall be either dry or oil-bath type of approved design and capacity. They shall conform to MIL-PRF-62048 or to the manufacturers standard specification, respectively (see 4.6.
30、8). 3.4.4 Oil. Engine shall perform as specified herein using lubricating oil in accordance with the seasonal requirements of MIL-PRF-2104 (or commercial equivalent) from -10 F to 115 F (-23.3C to 46.1C) and MIL-PRF-46167 (or commercial equivalent) from -65F to 0F (-53.8C to -17.7C). The manufacture
31、r may use oil of his own selection during engine build up and the break-in run. Reference grade oil used during the endurance test (see 4.6.10.12) shall be designated as specified (see 4.6.9). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-4
32、6796D 5 3.5 Performance 3.5.1 Engine break-in run. An engine break-in run shall be performed by the contractor. The break-in run schedule shall be established by the contractor to ensure that the engine, as offered for delivery, is suitable for immediate operation. All the required checks or tests,
33、complete and in sequence of performance and endurance, shall be performed with no loss in engine life expectancy (see 4.6.10.1, 4.6.10.1.1 and 4.6.10.1.2). 3.5.2 Speed range. The engine shall operate satisfactorily under all loads and conditions as specified herein through a speed range of 1150 to 2
34、600 revolutions per minute (rpm) (see 4.6.10.2). 3.5.2.1 Idle speed. The engine shall maintain a satisfactory idle speed of 550 to 600 rpm when using diesel fuel conforming to grade 4-D of ASTM D975 (see 4.6.10.2.1). 3.5.3 Governor. The governor shall limit the engine speed as follows during vehicle
35、 operations: Full Load 2275 to 2325 rpm No Load 2450 to 2500 rpm minimum When engine is equipped with a two speed governor, speed during winching operations shall be as follows: Full Load 1150 rpm minimum No Load 1350 rpm maximum In each case, the engine speed with no load on the engine shall stabil
36、ize within 3 seconds after full rack position is reached (see 4.6.10.3). 3.5.4 Brake horsepower (bhp). The bare engine at a full rack setting, upon the completion of the break-in run, shall develop not less than the brake horse power shown below at 2300 rpm using diesel fuel conforming to grade 4-D
37、of ASTM D975 (see 4.6.10.4). TYPE I 380 observed bhp TYPE II 418 observed bhp 3.5.4.1 Operating conditions. The engine horsepower rating shall be corrected to the following conditions (see 4.6.10.4). Dry air barometer 28.33 inches (in.) of mercury (Hg) (96 kilopascals (kPa) Inlet air temperature 90F
38、 (32.2C) Fuel (specific gravity 100F (37.7C) 0.853 at 60F(15.5C) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-46796D 6 Dry air density 0.0684 pounds per cubic feet (lb/ft3) (1.0956 kilograms per cubic meter (kg/m3) 3.5.5 Torque. The observ
39、ed torque at the engine flywheel, upon completion of the break-in run with the full rack setting, shall be not less than the lb-ft shown below at 1800 rpm using diesel fuel conforming to grade 4-D of ASTM D975 (see 4.6.10.5). TYPE I 885 pounds feet (lb-ft) (1200 Newton-meters (N-m) TYPE II 920 pound
40、s feet (lb-ft) (1247 Newton-meters (N-m) 3.5.6 Exhaust smoke density. The exhaust smoke density, at full rack position, shall be not more than the conditions as listed in table I or table II using diesel fuel conforming to grade 4-D of ASTM D975 (see 4.6.10.6). TABLE I Exhaust smoke density. Engine
41、speed (rpm) Meter number Visual number 1000 1400 2600 6 5 4 3 3 1 NOTE: The meter reading number shall take precedence over the visual reading. TABLE II Visual exhaust smoke density classification. Exhaust smoke description Visual number Clear Haze Light gray Medium gray Dark gray to black 1 2 3 4 5
42、 3.5.7 Fuel consumption. The fuel consumption of the base engine shall not exceed the limits specified in table III when operating at the full rack setting as specified in 3.5.4 using diesel fuel conforming to grade 4-D of ASTM D975 (see 4.6.10.7). TABLE III. Maximum observed brake specific fuel con
43、sumption. Engine speed (rpm) Fuel consumption (lb per bhp hour) 1400 1800 2300 TYPE I TYPE II 0.44 - - .370 0.43 .380 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-46796D 7 3.5.8 Oil consumption. The engine oil consumption shall be not more
44、 than 0.0012 lb (0.55 grams (g) of lubricating oil per observed bhp hour after 25 hours of operation at full rack through the engine performance check phase (see 4.5.2) with oil sump temperatures of 180 to 260F (82.2 to 126.6C), using oil as specified (see 4.6.10.8). 3.5.8.1 Oil pressure. With the e
45、ngine operating at 2300 rpm, the gallery oil pressure shall be not more than 80 psi (551 kPa) nor less than 35 psi (241 kPa), measured at the pressure sending unit, under all operating conditions specified herein, including a one quart low oil sump condition, with an oil sump temperature of not less
46、 than 180F (82.2C). The oil shall be as specified in 3.4.4 and shall be not less than 5 psi (34 kPa) when engine is idling as specified in 3.5.2.1 (see 4.6.10.8.1). 3.5.9 Coolant. The engine shall perform as specified herein using water and multi-engine type antifreeze compound conforming to A-A-526
47、24 or water and corrosion inhibitor compound conforming to MIL-A-53009 (see 4.6.10.9) 3.5.10 Limiting operating temperature. All versions of these 8V71T engine series, including the low heat rejection (LHR) (TYPE II) model, shall not exceed the following limiting temperatures when operating at full
48、load throughout the speed range of the engine under any of the conditions specified herein (see 4.6.10.10): a. Oil sump - 275F (135C) (measured at the drain plug). b. Coolant - 230F (110C) (measured at coolant outlet). 3.5.11 Air box pressure. The turbocharger and blower (combined) shall develop an
49、intake manifold pressure of not less than 50 inches of mercury (Hg) (169.3 kPa) gage when operating at full load and 2300 rpm, using fuel conforming to grade 4-D of ASTM D975 (see 4.6.10.11). 3.5.12 Endurance. The engine shall be capable of passing AEP-5 NATO standard engine 400 hour endurance laboratory test for diesel engines (part I
