Область применения

1.1 This test method is commonly referred to as the Mack T-8. This test method covers an engine test procedure for evaluating diesel engine oils for performance characteristics, including viscosity increase and soot concentrations (loading).

1.2 This test method also provides the procedure for running an extended length T-8 test, which is commonly referred to as the T-8E and an abbreviated length test, which is commonly referred to as T-8A. The procedures for the T-8E and the T-8A are identical to the T-8 with the exception of the items specifically listed in Annex A8 and Annex A9 respectively. Additionally, the procedure modifications listed in Annex A8 and Annex A9 refer to the corresponding section of the T-8 procedure.

1.3 The values stated in either SI or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound units are generally shown in parentheses when combined with SI units, and vice versa.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See Annex A6 for specific safety precautions.

1.5 A Table of Contents follows:

Scope1Referenced Documents2Terminology3Summary of Test Methods4Significance and Use5Apparatus6General Description6.1The Test Engine6.2Mack Test Engine6.2.1Engine Cooling System6.2.2Engine Oil System6.2.3Auxiliary Oil System6.2.4Crankcase Aspiration6.2.5Blowby Meter6.2.6Air Supply and Filtration6.2.7Fuel Supply6.2.8Intake Manifold Temperature Control6.2.9Engine Fluids7Test Oils7.1Test Fuel7.2Engine Coolant7.3Cleaning Materials7.4Preparation of Apparatus at Rebuild8Cleaning of Parts8.1Valves, Seats, Guides, and Springs8.2Cylinder Liner, Piston, and Piston Ring Assembly8.3Injectors and Injection Pump8.4Assembly Instructions8.5Measurements8.6Laboratory and Engine Test Stand Calibration/Non-Reference Requirements9Calibration Frequency9.1Calibration Reference Oils9.2Test Numbering9.3New Laboratories and New Test Stands9.4Calibrated Laboratories and Test Stands9.5Calibration Test Acceptance9.6Failing Calibration Tests9.7Non-Reference Oil Test Requirements9.8Procedure10Pretest Procedure10.1Engine Start-Up10.2Engine Shutdown10.3Test Cycle10.4Oil Addition/Drain10.5Oil Samples10.6Oil Consumption Calculations10.7Fuel Samples10.8Periodic Measurements10.9Blowby10.10Centrifugal Oil Filter Mass Gain10.11Oil Filter ∇P Calculation10.12Post Test10.13Inspection of Fuel and Oil During Test11Oil Inspection11.1Fuel Inspections11.2Oil Consumption11.3Report12Reporting Test Results12.1Deviations from Test Operational Limits12.2Electronic Transmission of Test Results12.3Plots of Operational Data12.4Precision and Bias13Precision13.1Bias13.2Keywords14AnnexesReport FormsAnnex A1Sensor LocationsAnnex A2Kinematic Viscosity At 100°C For Test Method D 5967 Samples Annex A3Enhanced Thermal Gravimetric Analysis (TGA) ProcedureAnnex A4Procurement of Test MaterialsAnnex A5Safety PrecautionsAnnex A6Data DictionaryAnnex A7T-8E Extended Length Test RequirementsAnnex A8T-8A Abbreviated Length Test RequirementsAnnex A9