ASTM D6923 Standard Test Method for Evaluation of Engine Oils in a High Speed, Single-Cylinder Diesel Engine - Caterpillar 1R Test Procedure
13. Report
13.1 Report Forms and Data Dictionary - For reference oil tests, the standardized report form set and data dictionary for reporting test results and for summarizing the operational data are required. The test report forms and data dictionary are available at the TMC website and not included in this test method. All changes to the report forms and data dictionary are under the control of the Surveillance Panel for the test method. Test report forms should closely resemble those located at the TMC. Report values for all the field names listed in the report forms. Some fields may be blank for short-term tests. Report all deposits, wear, and engine operational data as shown in the test report. The data dictionary defines the field lengths, decimal size, data type, units and format for the field names listed in the test report forms.
13.2 Test Validity - Document on the first sheet of the test report whether the test is Valid, Invalid, or Non-interpretable. For a valid stand calibration run, report the test data to TMC for inclusion of the test data in the operationally valid database and determine statistical validity using the LTMS method. For an invalid or non-interpretable stand calibration run, report the test data to TMC with comments describing why the test is considered invalid or non-interpretable. TMC does not include the test data in the operationally valid database. All operationally invalid and non-interpretable calibration tests are reported by the TMC to the ASTM Single Cylinder Diesel Surveillance Panel in periodic testing summaries.
NOTE 2 - For a valid ACC Registered Oil Test, report the data to Registration Systems, Inc.(RSI). For an invalid or non-interpretable ACC Registered Oil Test, report the test data to RSI with supporting comments describing why the test is considered invalid or non-interpretable.
NOTE 3 - When non-calibration oil tests are presented to Caterpillar for review, include the data from all tests that were registered with RSI as part of the program.
13.3 Report Specifics:
13.3.1 If more than one fuel batch is used, report the fuel batch analysis that is most representative of the fuel in the tank.
13.3.2 Report any causes for any missing or bad test data in the comment section of Form 8. If any alternative data acquisition method is used, document it in the comment section of Form 8.
13.3.3 If a calibration period is extended beyond the normal one year period, make a note in the comment section of Form 8 and attach a written confirmation from the TMC to the test report.
13.3.4 For calibration tests, list the outcome of previous failed or invalid calibration runs in the comment section of Form 8.
13.3.5 Include the fuel analysis provided by the fuel supplier as Form 15. For calibration tests, include a copy of the TMC control chart analysis as Form 18.
NOTE 4 - It is recommended that test purchasers include the form shown in Fig.X1.8 as Form 18 when presenting the test results against specification limits, such as those in Specification D4485 or military specifications.
14. Precision and Bias
14.1 Precision - Test precision is established on the basis of operationally valid reference oil test results monitored by the ASTM Test Monitoring Center. The data are reviewed semi-annually by the Single-Cylinder Diesel Surveillance Panel. Contact the ASTM TMC for current industry data.
14.1.1 Table 1 summarizes reference oil intermediate precision and reproducibility of the test. The tabulated values are current as of Feb.1, 2005. The Surveillance Panel updates these values as necessary.
14.1.2 Intermediate Precision Conditions - Conditions where test results are obtained with the same test method using the same test oil, with changing conditions such as operators, measuring equipment, test stands, test engines, and time.
NOTE 5 - Intermediate precision is the appropriate term for this test method rather than repeatability which defines more rigorous within-laboratory conditions.
14.1.2.1 Intermediate Precision Limit (i.p.) - The difference between two results obtained under intermediate precision conditions that would in the long run, in the normal and correct conduct of the test method, exceed the values shown in Table 1 in only one case in twenty. When only a single test result is available, the Intermediate Precision Limit can be used to calculate a range (test result +/- Intermediate Precision Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.1.3 Reproducibility Conditions - Conditions where two test results are obtained with the same test method using the same test oil in different laboratories with different operators using different equipment.
14.1.3.1 Reproducibility (R) - The difference between results obtained under reproducibility conditions that would, in the long run, in the normal and correct conduct of the test method, exceed the values in Table 1 in only one case in twenty. When only a single test result is available, the Reproducibility Limit can be used to calculate a range (test result +/- Reproducibility Limit) outside of which a second test result would be expected to fall about one time in twenty.
14.2 Bias - Bias is determined by applying an accepted statistical technique to reference oil test results, and when a significant bias is determined, a severity adjustment is permitted for non-reference oil test results (see TMC Memo 94-200, Lubricant Test Monitoring System document for details).
15. Keywords
15.1 Caterpillar 1R test procedure; oil consumption; piston deposits; single cylinder diesel oil test
