ASTM D5862 Standard Test Method for Evaluation of Engine Oils in Two-Stroke Cycle Turbo-Supercharged 6V92TA Diesel Engine
15. Preparation of Report
15.1 Test Numbering:
Use a four segment test number to provide a unique identification for each test. The format for this number is shown in Table 8.
15.2 Operational Data:
Provide accumulated operational data in the following format according to Forms 4 and 5 (see Annex A5) as appropriate.
AVERAGE STANDARD DEVIATION MAXIMUM MINIMUM
15.3 Photographs - Identify components from each cylinder with the test number appearing on the photograph. Identify thrust and anti-thrust sides where applicable.
15.3.1 Cylinder Liners - Split along crankshaft axis to show inside surface. Identify thrust and anti-thrust surfaces.
15.3.2 Pistons - Photograph thrust and anti-thrust of each with the pin bores parallel with the plane of the photograph. Optimize the lighting to identify areas of tin loss.
15.3.3 Rings - Arrange in position as they are on the piston, by cylinder. Photograph area 180° from the ring gap. One cylinder set per photo.
15.3.4 Slipper Bushings - It is recommended to arrange all six per photograph. Identify cylinder position.
15.3.5 Cylinder Heads Fire Deck or Piston Domes - All cylinders may be included in a single photograph, but shall be identified as to position. Photographs of either fire deck or piston domes may be taken for indication of any unusual lubricant ash deposits.
15.4 Test Oil Analysis - Record the oil analysis results of samples taken on Form 9 (see Annex A5) or a similar form.
15.5 Electronic Transmission of Test Results - Data may be transferred electronically to the TMC. This is especially desirable for those laboratories routinely submitting data to the TMC. ASTM Data Dictionaries have been prepared by the ASTM Data Communication Task Force that are specific to the 6V92TA Procedure. The report forms shown in Annex A5 contain variable names (Mnemonics) that correspond to mnemonics shown in Annex A6, Data Dictionary. These mnemonics are used to develop a flat-file for electronic data transfer. Mnemonics shown in the left most column in Annex A6 are industry approved standards and may assist users in developing data bases. In addition, the variable formats (significant digits) listed in Annex A6 are to be adhered to when reporting test results regardless of transfer medium. For more information on the use of Annex A6 and transmitting data electronically, contact the TMC.
16. Precision and Bias
16.1 Precision - To aid the potential user of this test method in assessing the variability that can be expected between test results when the test method is used in one or more laboratories, the precision information in Table 9 has been developed. Test precision is established on the basis of reference oil test results (for operationally valid tests) monitored by the ASTM Test Monitoring Center. The data are reviewed semiannually by the 6V92TA Surveillance Panel and are available on request from the TMC.
16.1.1 Repeatability (r) is defined as: the difference between successive results obtained by the same laboratory under constant operating conditions on the same oil. Table 9 shows that the repeatability was obtained by pooling standard deviation of test results obtained from individual laboratories across reference oils 861, 861.1, and 862.
16.1.2 Reproducibility (R) is defined as: the difference between two single and independent results obtained by different operators working in different laboratories on the same oil. The values (r and R) shown in Table 9 were based on data available in December 1994. The latest information for these precision values can be obtained from the TMC.
16.2 Bias - No estimate of the bias for this procedure is possible, as the behavior of an oil is determined only under the specific conditions of the test and no absolute standards exist.
17. Keywords
17.1 cylinder liner distress; diesel engines; engine oil; engine wear; heavy-duty performance; ring distress; scoring; scuffing;6V92TA test
