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  • ASTM
    D7468-15 Standard Test Method for Cummins ISM Test
    Edition: 2015
    $148.51
    Unlimited Users per year

Description of ASTM-D7468 2015

ASTM D7468-15

Historical Standard: Standard Test Method for Cummins ISM Test




ASTM D7468

Scope

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 and health 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

11.1.8

 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

Fuel Specification

Annex A6

Cummins Service Publications

Annex A7

Specified Units and Formats

Annex A8

Report Forms and Data Dictionary

Annex A9

Sludge Rating Worksheets

Annex A10

Oil Analyses

Annex A11

Determination of Operational Validity

Annex A12

Exhaust CO2 Sampling Probe

Annex A13

ISM Merit Rating Calculation

Annex A14

Appendix

 

Typical System Configurations

Appendix X1


Keywords

crosshead wear; Cummins ISM; de-rate protocols; diesel engine oil; exhaust gas recirculation; lubricants; oil filter delta pressure; sludge; top ring mass loss; valve train;


ICS Code

ICS Number Code 27.020 (Internal combustion engines)


DOI: 10.1520/D7468-15

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