ASTM D6987 Standard Test Method for Evaluation of Diesel Engine Oils in T-10 Exhaust Gas Recirculation Diesel Engine
10. Inspection of Engine, Fuel, and Oil
10.1 Pre-Test Measurements:
10.1.1 Pistons:
10.1.1.1 No piston measurements are required.
10.1.2 Cylinder Sleeves Inside Diameter Surface Finish - Measure in accordance with 10.1.2 of Test Method D6483. Report results on the appropriate form.
10.1.3 Piston Rings - Clean and measure according to the Mack Test Ring Cleaning and Measuring Procedure, available from the TMC. Report results on the appropriate form.
10.1.4 Connecting Rod Bearings - Clean and measure in accordance with 10.1.4 of Test Method D6483. Report results on the appropriate form.
10.2 Post Test Engine Measurements:
10.2.1 Pistons - Before removing pistons, carefully remove carbon from top of cylinder sleeve. Do not remove any metal.
10.2.1.1 Rate all six pistons for deposits in accordance with Test Method D6681. Use the 1P piston rating method. Report the results on the appropriate forms.
10.2.2 Cylinder Sleeves - Measure in accordance with Instructions for Measuring Cylinder Sleeves, available from the TMC. Report the results on the appropriate form.
10.2.3 Piston Rings - Clean and measure in accordance with the Mack Test Ring Cleaning and Measuring Procedure, available from the TMC. Report results on the appropriate form.
10.2.4 Connecting Rod Bearings - Clean and measure in accordance with 10.2.4 of Test Method D6483. Report the results on the appropriate form.
10.3 Oil Inspection:
10.3.1 Analyze oil samples for viscosity at 100 °C [212°F] in accordance with either Test Method D445 or Test Method D5967, Annex A3. Base viscosity increase on the minimum viscosity. In addition to the viscosity measurements, conduct soot analysis in accordance with Test Method D5967, Annex A4. Conduct the 75 h soot measurement twice and report the average (round the result in accordance with Practice E29). To maintain accuracy and precision, conduct all soot measurements at a TMC-calibrated laboratory. Determine wear metals content (iron, lead, copper, chromium, aluminum), additive metals content, silicon, and sodium levels in accordance with Test Method D5185 every 25 h from 0 h to EOT. Conduct EOT lead content measurements at least twice and report the average value. Conduct oil analysis as soon as possible after sampling. Determine base number every 25 h, including EOT, in accordance with Test Method D4739. Determine acid number every 25 h, including EOT, in accordance with Test Method D664. Determine oxidation using integrated IR every 25 h, including EOT. Report all results on the appropriate form.
10.4 Fuel Inspections:
10.4.1 Use fuel purchase inspection records to ensure conformance to the specifications (see 7.2.1) and to complete the appropriate form for the last batch of fuel used during the test. In addition, perform the following inspections on new (0 h) and EOT (300 h) fuel samples:
10.4.1.1 API gravity at 15.6 °C [60°F], Test Method D287 or D4052.
10.4.1.2 Total Sulfur, % mass, Test Method D129 or D2622.
10.4.1.3 Use one 1 L [1-qt] sample for inspections.
10.5 Oil Consumption Calculation:
10.5.1 Using the 6 min oil weight measurements (see 9.7), determine the oil consumption in grams per hour by performing linear regression on the data for each of the nine 25 h periods from 75 to 300 h. The oil consumption for a 25 h period is the slope of the regression line for that same period. The reported oil consumption is the average of the nine results.
10.5.1.1 Following any shutdowns, oil samples, oil additions, or phase transitions, exclude 1 h of oil mass data from the regression to account for the stabilizing of the oil scale.
10.5.1.2 If any shutdowns occur during a 25 h period, the result for that 25 h period shall be the weighted average of all the regression slope that apply to that period. The weighting of a regression slopes is the length of run time associated with it. An example with two shutdowns, one at 84 h and one at 93.5 h are shown in Table 4.
10.5.1.3 Report the average oil consumption for the test on the appropriate form.
