1、Designation:D 4681-87 Reprinted from the Annual Book of ASTM Standards.Copyright ASTM If not listed in the current combined index.will appear in the next edition Standard Specification for Lubricants for Two-Stroke-Cycle Spark-Ignition Gasoline Engines(TSC-4)An American N i i W Standard his standard
2、 is sued under the had designation D 468 1;the number immediately following the designation indicata the year of original adoption or,in the case of revision,the year of last rrvision.A number in parentheses indicates the year of last reapproval.A SuperSCnpt on(c)indicates an editoriai change since
3、the last revision or reapproval.1.scope 1.1 This specification sets out the requirements of lubri-cants intended for use in two-stroke-cycle spark-ignition gasoline engines,typicaily larger water-cooled outboard mo-tors,which are particularly prone to damage caused by deposit-induced preignition and
4、 to problems involving ring sticking,piston scuffing,and corrosion.A method is de-scribed by which the conformance of a lubricant to these requirements can be determined.1.2 The following safety hazards caveat pertains only to the test methods described in this specification.These test methods may i
5、nvolve the use o f hazardous materials,opera-tions,and equipment.This standard does not purport to address all o f the safety problems associated with its use.It is the responsibility o f the user o f this standard to establish appropriate safety and health practices and determine the applicability
6、o f regulatory limitations prior to use.1.3 The values for temperature,pressure,etc.stated in SI units are the standard;except that as the test engine used is designed to inch-pound standards,the values for dimensions,clearances,etc.stated in inch-pound units are the standard for the purpose of test
7、 engine setup and inspection.The conversion value of 25.4 mm=1 in.is exact.2.Referenced Documents 2.1 ASTM Standards:B 152 Specification for Copper,Sheet,Strip,Plate,and D 97 Test Methods for Pour Point of Petroleum Oils3 D 235 Specification for Minerai Spirits(Petroleum Spirits)D 439 Specification
8、for Automotive Gasoline3 D664 Test Method for Acid Number by Potentiometric D 874 Test Method for Sulfated Ash from Lubricating Oils D 1 193 Specification for Reagent Water4 D2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 4 0 C and lWC5 D2896 Test Method for Total Base Num
9、ber of Petroleum Products by Potentiometric Perchloric Acid Titrations Rolled B d (Hydrocarbon D r y Cleaning Solvent)3 Titration3 and Additives3 his specification is under the jurisdiction of%ommittee -2 on Petroleum Products and Lubricants and i s the direct rrsponsibty of Subcom-mittee W2.B on Au
10、tomotive Lubricants.Current edition approved M a y IS,1987.PubWed November 1987.Annual Book o f ASTM Standards,Vol 02.01.Annual Book o/ASTM Standar&Vol 05.0 1.Annual Book of ASTM Stanahrr,Vol 05.02.Annual Book o f ASTM Stan&?&,Vol 05.05 or 11.01.D 2983 Test Method for Low-Temperature Viscosity of Au
11、tomotive Fluid Lubricants Measured by Brookfield Viscomete?D 4682 Specification for Miscibility with Gasoline and the Fluidity of Two-Stroke-Cycle Gasoline Engine Lubri-cants6 E 230 Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples7 G 1 Practice for Preparing,Cleaning,and Eva
12、luating Corrosion Test Specimens 2.2 ANSI Standard:MC 96.1 American National Standard for Temperature Measurement Thermocouples9 3.Descriptions of Terms Specific to This Standard 3.1 cowls,cowlings-the components that enclose the powerhead,whether removable manually or not.3.2 engine-sometimes used
13、as a synonym for motor;both terms can be found in the literature.3.3 load wheel,test tank propeller-a power-absorbing device used instead of a propeller when the outboard motor is operated in a test tank.3.4 lower unit-the portions of the outboard motor other than the powerhead and its cowlings.3.5
14、motor-the total assembly of cowls,powerhead,and lower unit,excluding the propeller or load wheel and steering,remote control,and electrical cables external to the cowls.This term must not be used as a synonym for powerhead.3.6 plug fouling-deposition of essentially non-con-ducting material onto the
15、electrodes of a spark plug that can,but will not necessarily,prevent the plug from operating.3.7 plug whiskering or plug bridging-a deposit of con-ductive material on the spark plug electrodes,that tends to form a bridge between them,thus shorting out the plug.3.8 powerhead-the two-stroke-cycle gaso
16、line engine that provides power to the outboard motor,including carbure-tors,fuel pumps,flywheel,flywheel alternator,starter,igni-tion system,and ail other directly connected components required for its operation but excluding components at-tached to the short block by tubes or wires only.3.9 scu&smflng-in lubrication,damage caused by in-stantaneous local welding between the piston and bore surfaces that does not result in immobilization of the parts.Annual Book o f ASTM Standards,Vol 05.03.Annu
