1、Designation: D6681 10aStandard Test Method forEvaluation of Engine Oils in a High Speed, Single-CylinderDiesel EngineCaterpillar 1P Test Procedure1This standard is issued under the fixed designation D6681; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, 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.INTRODUCTIONAny properly equipped laboratory without outside assistance can use the test method
3、 described inthis standard. However, the ASTM Test Monitoring Center (TMC)2provides calibration oils and anassessment of the test results obtained on those oils by the laboratory. By this means the laboratorywill know whether their use of the test method gives results statistically similar to those
4、obtained byother laboratories. Furthermore, various agencies require that a laboratory utilize the TMC services inseeking qualification of oils against specifications. For example, the U.S.Army has such a requirementin some of its engine oil specifications. Accordingly, this test method is written f
5、or those laboratoriesthat use the TMC services. Laboratories that choose not to use these services should ignore thoseportions of the test method that refer to the TMC. Information Letters issued periodically by the TMCmay modify this method.3In addition, the TMC may issue supplementary memoranda re
6、lated to thetest method.1. Scope1.1 This test method covers and is required to evaluate theperformance of engine oils intended to satisfy certainAmericanPetroleum Institute (API) C service categories (included inSpecification D4485). It is performed in a laboratory using astandardized high-speed, si
7、ngle-cylinder diesel engine.4Pistonand ring groove deposit-forming tendency and oil consumptionis measured. The piston, the rings, and the liner are alsoexamined for distress and the rings for mobility.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are
8、 included in thisstandard.1.2.1 ExceptionsWhere there is no direct SI equivalentsuch as screw threads, National Pipe Threads/diameters, tubingsize, or where there is a sole source supply equipmentspecification.1.3 This standard does not purport to address all of thesafety concerns, if any, associate
9、d with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Being an enginetest method, this standard does have definite hazards thatrequire safe practices (see App
10、endix X2 on Safety).1.4 The following is the Table of Contents:SectionScope 1Referenced Documents 2Terminology 3Summary of Test Method 4Significance and Use 5Apparatus and Installation 6Intake Air System 6.2.1Exhaust System 6.2.2Fuel System 6.2.3Oil Consumption System 6.2.4Engine Oil System 6.2.5Oil
11、 Heating System 6.2.5.1Oil Sample Valve 6.2.5.2Engine Coolant System 6.2.6Engine Instrumentation 6.2.7Reagents and Materials 7Oil Samples 8Preparation of Apparatus 9General Engine Assembly Practices 9.1Complete Engine Inspection 9.2Copper Components 9.3Engine Lubricant System Flush 9.4Engine Piston
12、Cooling Jets 9.5Engine Measurements and Inspections 9.6Cylinder Head 9.7Valve Guide Bushings 9.81This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.B0.02 on Heavy Duty Engine Oils.Current edition ap
13、proved Oct. 1, 2010. Published November 2010. Originallyapproved in 2001. Last previous edition approved in 2010 as D668110. DOI:10.1520/D6681-10A.2ASTM Test Monitoring Center (TMC), 6555 Penn Ave., Pittsburgh, PA152064489.3This edition incorporates revisions contained in all information letters thr
14、ough10-1. Users of this test method shall contact the ASTM Test Monitoring Center toobtain the most recent information letters.4Available from Caterpillar Inc., Engine System Technology Development, P.O.Box 610, Mossville, IL 61552-0610.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7
15、00, West Conshohocken, PA 19428-2959, United States.SectionFuel Injector 9.9Piston and Rings 9.10Cylinder Liner 9.11Compression Ratio 9.12Engine Timing 9.13Engine Coolant System Cleaning Procedure 9.14Calibration and Standardization 10Test Cell Instrumentation 10.1Instrumentation Standards 10.2Coola
16、nt Flow 10.3Re-calibration Requirements 10.4Fuel Injectors 10.5Air Flow 10.6Intake Air Barrel 10.7Fuel Filter 10.8Oil Scale Flow Rates 10.9Calibration of Test Stands 10.10Extending Test Stand Calibration Period 10.11Test Run Numbering 10.13Humidity Calibration Requirements 10.14Calibration of Piston
17、 Deposit Raters 10.15Procedure 11Engine Break-in Procedure 11.1Cool-down Procedure 11.2Warm-up Procedure 11.3Shutdowns and Lost Time 11.4Periodic Measurements 11.5Engine Control Systems 11.6Engine Coolant 11.6.1Engine Fuel System 11.6.2Engine Oil Temperature 11.6.3Exhaust Pressure 11.6.4Intake Air 1
18、1.6.5Post-Test Procedures 11.7Piston Ring Side Clearances 11.7.1Piston Ratings 11.7.2Referee Ratings 11.7.3Ring End Gap Increase 11.7.4Cylinder Liner Wear 11.7.5Cylinder Liner Bore Polish 11.7.6Photographs 11.7.7Calculation and Interpretation of Results 12Test Validity 12.1Calculations 12.2Quality I
19、ndex 12.2.1Oil Consumption 12.2.2Report 13Forms and Data Dictionary 13.1Test Validity 13.2Report Specifics 13.3Precision and Bias 14Precision 14.1Bias 14.1.4Keywords 15AnnexesEngine and Parts Warranty Annex A1Instrument Locations, Measurements, and Calculations Annex A2Cooling System Arrangement Ann
20、ex A3Intake Air Mass Flow Sensor Installation Annex A4Fuel System Design and Required Components Annex A5Oil System Annex A6Exhaust and Intake Barrel Piping Annex A7Humidity Probe Installation (Location) Annex A8Return Goods Authorization (Claim Form) Annex A9Engine Assembly Information Annex A10Flu
21、shing Instructions and Apparatus Annex A11Warm-up, Cool-down and Testing Conditions Annex A12Piston and Liner Rating Modifications Annex A13Additional Report Forms Annex A14Test Report Forms Annex A15AppendixesVarious Examples for Reference Purposes Appendix X1Safety Appendix X22. Referenced Documen
22、ts2.1 ASTM Standards:5D86 Test Method for Distillation of Petroleum Products atAtmospheric PressureD93 Test Methods for Flash Point by Pensky-MartensClosed Cup TesterD97 Test Method for Pour Point of Petroleum ProductsD130 Test Method for Corrosiveness to Copper from Pe-troleum Products by Copper St
23、rip TestD235 Specification for Mineral Spirits (Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids (and Calculation of Dynamic Viscos-ity)D482 Test Method for Ash from Petroleum ProductsD524 Test Method for Ramsbottom Carbon
24、Residue ofPetroleum ProductsD613 Test Method for Cetane Number of Diesel Fuel OilD664 Test Method for Acid Number of Petroleum Productsby Potentiometric TitrationD1319 Test Method for Hydrocarbon Types in LiquidPetroleum Products by Fluorescent Indicator AdsorptionD2274 Test Method for Oxidation Sta
25、bility of DistillateFuel Oil (Accelerated Method)D2425 Test Method for Hydrocarbon Types in MiddleDistillates by Mass SpectrometryD2500 Test Method for Cloud Point of Petroleum ProductsD2622 Test Method for Sulfur in Petroleum Products byWavelength Dispersive X-ray Fluorescence SpectrometryD2709 Tes
26、t Method for Water and Sediment in MiddleDistillate Fuels by CentrifugeD3227 Test Method for (Thiol Mercaptan) Sulfur in Gaso-line, Kerosine, Aviation Turbine, and Distillate Fuels(Potentiometric Method)D3524 Test Method for Diesel Fuel Diluent in Used DieselEngine Oils by Gas ChromatographyD4175 Te
27、rminology Relating to Petroleum, PetroleumProducts, and LubricantsD4052 Test Method for Density, Relative Density, and APIGravity of Liquids by Digital Density MeterD4485 Specification for Performance of Engine OilsD4739 Test Method for Base Number Determination byPotentiometric Hydrochloric Acid Ti
28、trationD5185 Test Method for Determination of Additive Ele-ments, Wear Metals, and Contaminants in Used Lubricat-ing Oils and Determination of Selected Elements in BaseOils by Inductively Coupled Plasma Atomic EmissionSpectrometry (ICP-AES)5For referenced ASTM standards, visit the ASTM website, www.
29、astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.D6681 10a2D5862 Test Method for Evaluation of Engine Oils inTwo-Stroke Cycle Turbo-Supercharged 6V92TA DieselEngine6D6202
30、 Test Method forAutomotive Engine Oils on the FuelEconomy of Passenger Cars and Light-Duty Trucks in theSequence VIA Spark Ignition Engine6D6593 Test Method for Evaluation of Automotive EngineOils for Inhibition of Deposit Formation in a Spark-Ignition Internal Combustion Engine Fueled with Gasoline
31、and Operated Under Low-Temperature, Light-Duty Con-ditionsD7422 Test Method for Evaluation of Diesel Engine Oils inT-12 Exhaust Gas Recirculation Diesel EngineE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsG40 Terminology Relating to Wear and Erosio
32、n2.2 SAE Standard:SAE J183 Engine Oil Performance and Engine ServiceClassification72.3 API Standard:API 1509 Engine Service Classification and Guide toCrankcase Oil Selection83. Terminology3.1 Definitions:3.1.1 additive, na material added to another, usually in asmall amount, to impart or enhance de
33、sirable properties or tosuppress undesirable properties. D41753.1.2 automotive, adjdescriptive of equipment associatedwith self-propelled machinery, usually vehicles driven byinternal combustion engines. D44853.1.3 blind reference oil, na reference oil, the identity ofwhich is unknown by the test fa
34、cility. D41753.1.3.1 DiscussionThis is a coded reference oil which issubmitted by a source independent from the test facility.3.1.4 blowby, nin internal combustion engines, that por-tion of the the combustion products and unburned air/fuelmixture that leaks past piston rings into the engine crankcas
35、eduring operation. D41753.1.5 calibrate, vto determine the indication or output ofa device (e.g., thermometer, manometer, engine) with respectto that of a standard.3.1.6 calibrated test stand, na test stand on which thetesting of reference material(s), conducted as specified in thestandard, provided
36、 acceptable test results. Sub. B Glossary23.1.6.1 DiscussionIn several automotive lubricant stan-dard test methods, the ASTM Test Monitoring Center providestesting guidance and determines acceptability.3.1.7 candidate oil, nan oil which is intended to have theperformance characteristics necessary to
37、 satisfy a specificationand is to be tested against that specification. D41753.1.7.1 DiscussionThese oils are mainly submitted fortesting as candidates to satisfy a specified performance; hencethe designation of the term.3.1.8 debris, nin internal combustion engines, solid con-taminant materials uni
38、ntentionally introduced into the engineor resulting from wear. D58623.1.9 dispersant, nin engine oil, an additive that reducesdeposits on oil-wetted engine surfaces primarily through sus-pension of particles. D41753.1.10 engine oil, na liquid that reduces friction or wear,or both, between the moving
39、 parts within an engine; removesheat, particularly from the underside of pistons; and serves asa combustion gas sealant for the piston rings. D58623.1.10.1 DiscussionIt may contain additives to enhancecertain properties. Inhibition of engine rusting, deposit forma-tion, valve train wear, oil oxidati
40、on and, foaming are examples.3.1.11 heavy-duty, adjin internal combustion engine op-eration, characterized by average speeds, power output, andinternal temperatures that are generally close to the potentialmaximums. D44853.1.12 lubricant, nany material interposed between twosurfaces that reduces the
41、 friction or wear, or both, betweenthem. D58623.1.13 lubricating oil, na liquid lubricant, usually com-prising several ingredients, including a major portion of baseoil and minor portions of various additives. D417523.1.14 oxidation, nof engine oil, the reaction of the oilwith an electron acceptor,
42、generally oxygen, that can producedeleterious acidic or resinous materials often manifested assludge formation, varnish formation, viscosity increase, orcorrosion, or a combination thereof. D41753.1.15 non-reference oil, nany oil other than a referenceoil; such as a research formulation, commercial
43、oil, or candi-date oil. D41753.1.16 purchaser, nof an ASTM test, person or organiza-tion that pays for the conduct of an ASTM test method on aspecified product. D62023.1.17 reference oil, nan oil of known performance char-acteristics, used as a basis for comparison.3.1.17.1 DiscussionReference oils
44、are used to calibratetesting facilities, to compare the performance of other oils, orto evaluate other material (such as seals) that interact with oils.D41753.1.18 scoring, nin tribology, a severe form of wearcharacterized by the formation of extensive grooves andscratches in the direction of slidin
45、g. G403.1.19 scuffng, nin lubrication, damage caused by instan-taneous localized welding between surfaces in relative motionwhich does not result in immobilization of the parts. D65933.1.20 sponsor, nof an ASTM test method, an organizationthat is responsible for ensuring supply of the apparatus used
46、 inthe test procedure portion of the test method. D41753.1.20.1 DiscussionIn some instances, such as a testmethod for chemical analysis, an ASTM working group can bethe sponsor of the test method. In other instances, a companywith a self-interest may or may not be the developer of the testprocedure
47、used within the method, but is the sponsor of the testmethod.6Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.7Available from the Society of Automotive Engineers Inc., 400 CommonwealthDrive, Warrendale, PA 15096.8Available from the American Petroleum Ins
48、titute, 1220 L Street NW, Wash-ington DC, 20005.D6681 10a33.1.21 used oil, nany oil that has been in a piece ofequipment (for example, an engine, gearbox, transformer, orturbine), whether operated or not. D41753.1.22 varnish, nin internal combustion engines, a hard,dry, generally lustrous deposit th
49、at can be removed by solventsbut not by wiping with a cloth. D41753.1.23 wear, nthe loss of material from a surface, gener-ally occurring between two surfaces in relative motion, andresulting from mechanical or chemical action or a combinationof both. D74224. Summary of Test Method4.1 Prior to each test, the power section of the engine isdisassembled, solvent-cleaned, measured, and rebuilt in strictaccordance with the specifications. A new piston, ring assem-bly, and cylinder liner are measured and installed for each test.The engine crankcase is sol
