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1.1 The test method covers a heavy-duty diesel engine test procedure conducted under high soot conditions to evaluate oil performance with regard to valve train wear, top ring wear, sludge deposits, and oil filter plugging in an EGR environment. This test method is commonly referred to as the Cummins ISM Test.2

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 Exception—The only exception is where there is no direct SI equivalent such as screw threads, national pipe threads/diameters, tubing sizes, or where there is a sole source of supply equipment specification.

1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Annex A1 for general safety precautions.

1.4 Table of Contents:

	Section
Scope	1
Referenced Documents	2
Terminology	3
Summary of Test Method	4
Significance and Use	5
Apparatus	6
Test Engine Configuration	6.1
Test Engine	6.1.1
Oil Heat Exchanger, Adapter Blocks, Block Off Plate	6.1.2
Oil Filter Head Modification	6.1.3
Oil Pan Modification	6.1.4
Engine Control Module (ECM)	6.1.5
Engine Position Sensor	6.1.6
Intake Manifold Temperature Sensor	6.1.7
Barometric Pressure Sensor	6.1.8
Turbocharger Controller	6.1.9
Power Supply Voltage	6.1.10
Air Compressor and Fuel Pump	6.1.11
Engine Block Preparation	6.1.12
Test Stand Configuration	6.2
Engine Mounting	6.2.1
Intake Air System	6.2.2
Aftercooler	6.2.3
Exhaust System	6.2.4
Exhaust Gas Recirculation System	6.2.5
Fuel System	6.2.6
Coolant System	6.2.7
Pressurized Oil Fill System	6.2.8
External Oil System	6.2.9
Crankcase Aspiration	6.2.10
Blowby Rate	6.2.11
System Time Responses	6.3
Oil Sample Containers	6.4
Mass Balance	6.5
Engine and Cleaning Fluids	7
Test Oil	7.1
Test Fuel	7.2
Engine Coolant	7.3
Pentane	7.4
Solvent	7.5
Preparation of Apparatus	8
Cleaning of Parts	8.1
General	8.1.1
Engine Block	8.1.2
Cylinder Head	8.1.3
Rocker Cover and Oil Pan	8.1.4
External Oil System	8.1.5
Crosshead Cleaning and Measurement	8.1.6
Rod Bearing Cleaning and Measurement	8.1.7
Ring Cleaning and Measurement	8.1.8
Injector Adjusting Screw Cleaning and Measurement	8.1.9
Engine Assembly	8.2
General	8.2.1
Parts Reuse and Replacement	8.2.2
Build-Up Oil	8.2.3
Coolant Thermostat	8.2.4
Oil Thermostat	8.2.5
Fuel Injectors	8.2.6
New Parts	8.2.7
Operational Measurements	8.3
Units and Formats	8.3.1
Instrumentation Calibration	8.3.2
Temperatures	8.3.3
Pressures	8.3.4
Flow Rates	8.3.5
Intake and Exhaust CO₂ Measurement	8.3.6
Engine/Stand Calibration and Non-Reference Oil Tests	9
General	9.1
New Test Stand	9.2
New Test Stand Calibration	9.2.1
Stand Calibration Period	9.3
Stand Modification and Calibration Status	9.4
Test Numbering System	9.5
General	9.5.1
Reference Oil Tests	9.5.2
Non-Reference Oil Tests	9.5.3
Reference Oil Test Acceptance	9.6
Reference Oil Accountability	9.7
Last Start Date	9.8
Donated Reference Oil Test Programs	9.9
Adjustments to Reference Oil Calibration Periods	9.10
Procedural Deviations	9.10.1
Parts and Fuel Shortages	9.10.2
Reference Oil Test Data Flow	9.10.3
Special Use of the Reference Oil Calibration System	9.10.4
Test Procedure	10
Engine Installation and Stand Connections	10.1
Coolant System Fill	10.2
Oil Fill for Break-in	10.3
Engine Build Committed	10.3.3
Fuel Samples	10.4
Engine Warm-up	10.5
Shutdown During Warm-up	10.5.1
Engine Break-in	10.6
Shutdown and Maintenance	10.7
Normal Shutdown	10.7.1
Emergency Shutdown	10.7.2
Maintenance	10.7.3
Downtime	10.7.4
200-h Test Procedure	10.8
Oil Fill for Test	10.8.2
Operating Conditions	10.8.4
Injection Timing Change	10.8.5
Mass % Soot Validity	10.8.6
Test Timer	10.8.7
Operational Data Acquisition	10.8.8
Oil Sampling	10.8.9
Oil Addition	10.8.10
End of Test (EOT)	10.9
Engine Disassembly	10.9.3
Calculations, Ratings and Test Validity	11
Crosshead Mass Loss	11.1
Crosshead Mass Loss Correction Factor	11.1.7.1
Injector Adjusting Screw Mass Loss	11.2
Injector Adjusting Screw Correction Factor	11.2.5
Ring Mass Loss	11.3
Sludge Ratings	11.4
Oil Filter Plugging	11.5
Oil Analyses	11.6
Oil Consumption	11.7
Fuel Analyses	11.8
Additional Analysis	11.8.1
Assessment of Operational Validity	11.9
Assessment of Test Interpretability	11.10
Test Report	12
Report Forms	12.1
Reference Oil Test	12.2
Electronic transmission of Test Results	12.2.1
Precision and Bias	13
Precision	13.1
Intermediate Precision Conditions	13.1.1
Reproducibility Conditions	13.1.2
Bias	13.2
Keywords	14
Annexes
Safety Precautions	Annex A1
Intake Air Aftercooler	Annex A2
Engine Build Parts Kit	Annex A3
Sensor Locations, Special Hardware, and Engine Block Modifications	Annex A4
External Oil System	Annex A5
Cummins Service Publications	Annex A6
Specified Units and Formats	Annex A7
Report Forms and Data Dictionary	Annex A8
Sludge Rating Worksheets	Annex A9
Oil Analyses	Annex A10
Determination of Operational Validity	Annex A11
Exhaust CO₂ Sampling Probe	Annex A12
ISM Merit Rating Calculation	Annex A13
Appendix
Typical System Configurations	Appendix X1

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Main informations

Collections

ASTM american standards

Publication date

July 2022

Number of pages

36 p.

Reference

ASTM D7468-22

Classification index

D7468-22

Replaced standards (1)

ASTM D7468-21

July 2021

Standard Cancelled

Standard Test Method for Cummins ISM Test

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