1、Designation: D7422 12D7422 13Standard Test Method forEvaluation of Diesel Engine Oils in T-12 Exhaust GasRecirculation Diesel Engine1This standard is issued under the fixed designation D7422; the number immediately following the designation indicates the year oforiginal adoption or, in the case of r
2、evision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers an engine test procedure for evaluating diesel engine oils for performan
3、ce characteristics, includinglead corrosion and wear of piston rings and cylinder liners in an engine equipped with exhaust gas recirculation and running onultra-low sulfur diesel fuel.2 This test method is commonly referred to as the Mack T-12.1.1.1 This test method also provides the procedure for
4、running an abbreviated length test, which is commonly referred to as theT-12A. The procedures for the T-12 and T-12A are identical with the exception of the items specifically listed in Annex A9.Additionally, the procedure modifications listed in Annex A9 refer to the corresponding section of the T-
5、12 procedure.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.2.1 ExceptionWhere there is no direct SI equivalent, such as the units for screw threads, National Pipe Threads/diameters,tubing size, and single source supply
6、 equipment specifications.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prio
7、r to use. See Annex A6 for specific safety precautions.2. Referenced Documents2.1 ASTM Standards:3D86 Test Method for Distillation of Petroleum Products at Atmospheric PressureD93 Test Methods for Flash Point by Pensky-Martens Closed Cup TesterD97 Test Method for Pour Point of Petroleum ProductsD130
8、 Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip TestD235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)D287 Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer Method)D445 Test Method for Kinemat
9、ic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)D482 Test Method for Ash from Petroleum ProductsD524 Test Method for Ramsbottom Carbon Residue of Petroleum ProductsD613 Test Method for Cetane Number of Diesel Fuel OilD664 Test Method for Acid Number of Petroleum
10、Products by Potentiometric TitrationD976 Test Method for Calculated Cetane Index of Distillate FuelsD1319 Test Method for Hydrocarbon Types in Liquid Petroleum Products by Fluorescent Indicator AdsorptionD2274 Test Method for Oxidation Stability of Distillate Fuel Oil (Accelerated Method)D2500 Test
11、Method for Cloud Point of Petroleum ProductsD2622 Test Method for Sulfur in Petroleum Products by Wavelength Dispersive X-ray Fluorescence SpectrometryD2709 Test Method for Water and Sediment in Middle Distillate Fuels by CentrifugeD3338 Test Method for Estimation of Net Heat of Combustion of Aviati
12、on Fuels1 This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.B0 onAutomotive Lubricants.Current edition approved April 15, 2012May 1, 2013. Published September 2012June 2013. Originally approved i
13、n 2008. Last previous edition approved in 20112012 asD7422D7422 12.11. DOI: 10.1520/D7422-12.10.1520/D7422-13.2 The ASTM Test Monitoring Center will update changes in this test method by means of Information Letters. Information letters may be obtained from the ASTM TestMonitoring Center, 6555 Penn
14、Avenue, Pittsburgh, PA 15206-4489, Attention: Administrator. This edition incorporates revisions in all Information Letters through No.113.121.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvol
15、ume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adeq
16、uately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM
17、International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density MeterD4175 Terminology Relating to Petroleum, Petroleum Products, and LubricantsD4294 Test Method for Sulf
18、ur in Petroleum and Petroleum Products by Energy Dispersive X-ray Fluorescence SpectrometryD4485 Specification for Performance of Active API Service Category Engine OilsD4739 Test Method for Base Number Determination by Potentiometric Hydrochloric Acid TitrationD5185 Test Method for Determination of
19、 Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils andDetermination of Selected Elements in Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)D5186 Test Method for Determination of theAromatic Content and PolynuclearAromatic Content of Diesel Fuels
20、 andAviationTurbine Fuels By Supercritical Fluid ChromatographyD5453 Test Method for Determination of Total Sulfur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel,and Engine Oil by Ultraviolet FluorescenceD5967 Test Method for Evaluation of Diesel Engine Oils in T-8 Diesel Engi
21、neD6078 Test Method for Evaluating Lubricity of Diesel Fuels by the Scuffing Load Ball-on-Cylinder Lubricity Evaluator(SLBOCLE)D6896 Test Method for Determination of Yield Stress and Apparent Viscosity of Used Engine Oils at Low TemperatureE29 Practice for Using Significant Digits in Test Data to De
22、termine Conformance with SpecificationsE178 Practice for Dealing With Outlying Observations2.2 National Archives and Records Administration:4Code of Federal Regulations Title 40 Part 86.310-793. Terminology3.1 Definitions:3.1.1 blind reference oil, na reference oil, the identity of which is unknown
23、by the test facility.3.1.1.1 DiscussionThis is a coded reference oil that is submitted by a source independent from the test facility. D41753.1.2 blowby, nin internal combustion engines, that portion of the combustion products and unburned air/fuel mixture thatleaks past piston rings into the engine
24、 crankcase during operation.3.1.3 calibrate, vto determine the indication or output of a device (e.g., thermometer, manometer, engine) with respect to thatof a standard.3.1.4 candidate oil, nan oil that is intended to have the performance characteristics necessary to satisfy a specification andis in
25、tended to be tested against that specification. D41753.1.5 exhaust gas recirculation (EGR), nthe mixing of exhaust gas with intake air to reduce the formation of nitrogen oxides(NOx). D41753.1.6 heavy-duty, adjin internal combustion engine operation, characterized by average speeds, power output and
26、 internaltemperatures that are close to the potential maximums. D41753.1.7 heavy-duty engine, nin internal combustion engine types, one that is designed to allow operation continuously at or closeto its peak output.3.1.8 non-reference oil, nany oil other than a reference oil; such as a research form
27、ulation, commercial oil or candidate oil.D41753.1.9 non-standard test, na test that is not conducted in conformance with the requirements in the standard test method; suchas running on an uncalibrated test stand, using different test equipment, applying different equipment assembly procedures, or us
28、ingmodified operating conditions. D41753.1.10 oxidation, nof engine oil, the reaction of the oil with an electron acceptor, generally oxygen, that can producedeleterious acidic or resinous materials often manifested as sludge formation, varnish formation, viscosity increase, or corrosion,or combinat
29、ion thereof.3.1.11 reference oil, nan oil of known performance characteristics, used as a basis for comparison.3.1.11.1 Discussion4 Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.D7422
30、 132Reference oils are used to calibrate testing facilities, to compare the performance of other oils, or to evaluate other materials (suchas seals) that interact with oils. D41753.1.12 sludge, nin internal combustion engines, a deposit, principally composed of insoluble resins and oxidation product
31、sfrom fuel combustion and the lubricant, that does not drain from engine parts but can be removed by wiping with a cloth. D41753.1.13 standard test, na test on a calibrated test stand, using the prescribed equipment in accordance with the requirementsin the test method, and conducted in accordance w
32、ith the specified operating conditions.3.1.14 test parameter, na specified component, property, or condition of a test procedure.3.1.14.1 DiscussionExamples of components are fuel, lubricant, reagent, cleaner, and sealer; of properties are density, temperature, humidity, pressure,and viscosity; and
33、of conditions are flow rate, time, speed, volume, length, and power. D41753.1.15 varnish, nin internal combustion engines, a hard, dry, generally lustrous deposit that can be removed by solvents butnot by wiping with a cloth. D41753.1.16 wear, nthe loss of material from a surface, generally occurrin
34、g between two surfaces in relative motion, and resultingfrom mechanical or chemical action or a combination of both. D41754. Summary of Test Method4.1 The test operation involves use of a Mack E-TECH V-MAC III diesel engine with Exhaust Gas Recirculation (EGR). Awarm-up and a 1 h break-in are follow
35、ed by a two-phase test consisting of 100 h at 1800 r/min and 200 h at 1200 r/min, both atconstant speed and load.4.2 Take oil samples periodically and analyze for viscosity increase and wear metals content.4.3 Rebuild the engine prior to each test. Disassemble, solvent-clean, measure, and rebuild, t
36、he engine power section using allnew pistons, rings, cylinder liners, and connecting rod bearings, in strict accordance with furnished specifications.4.4 Solvent-clean the engine crankcase and replace worn or defective parts.4.5 Equip the test stand with appropriate accessories for controlling speed
37、, torque, and various engine operating conditions.5. Significance and Use5.1 This test method was developed to evaluate the wear performance of engine oils in turbocharged and intercooled four-cyclediesel engines equipped with EGR and running on ultra-low sulfur diesel fuel. Obtain results from used
38、 oil analysis and componentmeasurements before and after test.5.2 The test method may be used for engine oil specification acceptance when all details of the procedure are followed.6. Apparatus6.1 General Description:6.1.1 The test engine is a Mack E-TECH V-MAC III, electronically controlled fuel in
39、jection with six electronic unit pumps,using 2002 cylinder heads, P/N 11GBA81025 (Annex A2). It is an open-chamber, in-line, six-cylinder, four-stroke, turbocharged,charge air-cooled, and compression ignition engine. The bore and stroke are (124 by 165) mm, and the displacement is 12 L.6.1.2 The amb
40、ient laboratory atmosphere shall be relatively free of dirt and other contaminants as required by good laboratorystandards. Filtering air, controlling temperature, and controlling humidity in the engine buildup area helps prevent accumulationof dirt and other contaminants on engine parts and aids in
41、 measuring and selecting parts for assembly.6.2 Test Engine:6.2.1 Mack T-12 Test EngineThe engine is available from Mack Trucks, Inc.Acomplete parts list is shown in TableA2.1. Usetest parts on a first-in/first-out basis.6.2.2 Engine Cooling System:6.2.2.1 Use a new Mack coolant conditioner shown in
42、 Table A2.1, every test, to limit scaling in the cooling system. Pressurizethe system at the expansion tank to 103 kPa. Use the coolant described in 7.3.1.6.2.2.2 Use a closed-loop, pressurized external engine cooling system composed of a nonferrous core heat exchanger, reservoir,and water-out tempe
43、rature control valve. The system shall prevent air entrainment and control jacket temperatures within thespecified limit. Install a sight glass between the engine and the cooling tower to check for air entrainment and uniform flow in aneffort to observe and prevent localized boiling. Block the therm
44、ostat wide open.6.2.2.3 Use a closed-loop, pressurized external EGR cooling system composed of a nonferrous core heat exchanger, reservoir,and coolant-out temperature control valve. The system shall prevent air entrainment and control jacket temperatures within thespecified limit. Install a sight gl
45、ass between the EGR coolers and the cooling tower to check for air entrainment and uniform flowin an effort to observe and prevent localized boiling. The coolant flow direction is to be parallel (concurrent) with the EGR gasD7422 133flow. Every reasonable attempt should be made to ensure that the EG
46、R temperatures leaving the coolers are very similar. Fig.A1.3shows the coolant flow to and from the EGR coolers, respectively.6.2.3 Auxiliary Oil System:6.2.3.1 To maintain a constant oil level in the pan, provide an additional 9.5 L sump by using a separate closed tank connectedto the sump. Circula
47、te oil through the tank with an auxiliary pump. The system schematic is shown in Fig. A1.1. The No. 6 andNo. 8 Aeroquip5 lines are to have inside diameters of 10 mm and 13 mm, respectively. Use a minimum No. 8 size vent line.Equivalent lines may be substituted for Aeroquip5 lines provided they have
48、the proper inside diameters.6.2.3.2 Locate the auxiliary oil system suction line on the exhaust side of the oil pan, down from the oil pan rail 127 mm, andback from the front of the pan 178 mm. This location is directly above the oil sump temperature thermocouple. Refer to Fig.A1.4.Connect the auxil
49、iary oil system return line to the power steering pump cover on the front timing gear cover. Refer to Fig. A1.5.Connect the auxiliary oil scale vent line to the top of the auxiliary oil sump bucket and the dipstick tube opening.6.2.3.3 Use Viking Pump Model SG053514 as the auxiliary oil pumps. Pump speed is specified as 1725 r/min.66.2.4 Oil Cooling System:6.2.4.1 Use the oil cooler adapter blocks to mount the oil cooler to the engine.The adapter blocks are available from the supplierlist in A2.7.6.2.4.2 Use the oil filter housing (part number 27GB525M)
