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-W P-C-111C <br /> 4.5. 19.4 Cleaning procedure. Test the soil control compound, the compari- <br /> son formula and the submitted carbon remover at the same time. Place the un- <br /> cut center of each piston into the soil control compound (4.5. 19.1) , one of <br /> each matched pair of sections into the comparison formula (4.5.19.2) and the <br /> other into the carbon removing compound being tested. The same amount of each <br /> compound should be used, each section should be completely submerged and held <br /> off the bottom by means of a small glass rod, and each pair of matched sections <br /> should be kept as a distinct unit. Allow the sections to remain in the clean- <br /> ing compounds for 16 hours at room temperature. Then remove the sections <br /> (using rubber gloves) and scrub them with hard bristle brush and cool water <br /> (about 85°F.) . Make sure that each section is cleaned thoroughly and in a <br /> similar manner. Place the original matched sections on paper towelling, <br /> keeping each piston separate, and allow them to air dry. <br /> 4.5. 19.5 Evaluation of test results. Compare the center sections cleaned <br /> with the soil control compound .5.19. 0 and the sections cleaned with the <br /> comparison formula (4.5. 19.2) . The ones in the comparison formula must be <br /> more free of carbon than the ones in the soil control compound to be consid- <br /> ered as valid test pistons. Use six valid test pistons for the evaluation <br /> of the test compound. Compare the matched sections of each valid test piston. <br /> Consider the section superior which has the most area free of any soil or <br /> smudge when examined visually. The test compound fails the carbon loosening <br /> requirement if there is more than one piston in which it is inferior that is <br /> not balanced by a piston in which it is superior and shall pass in all other <br /> cases. The test compound shall be considered as inferior in the individual <br /> piston test when there is more than one section in which it is inferior that <br /> is not balanced by a section in which it is superior. The test compound shall <br /> be considered as superior in the individual piston test when there is more <br /> than one section in which it is superior that is not balanced by a section in <br /> which it is inferior. In all other cases, the compounds shall be considered <br /> equal for the individual piston test. <br /> 4.5.20 Carbon loosening ability at 130°F. Conduct the test outlined in <br /> 4.5. 19 on another group of pistons using a temperature of 130°F. (540C.) and <br /> an immersion time of 4 + 1/4 hour. <br /> 4.5.21 Paint stripping ability. <br /> 4.5.21 . 1 Preparation of test panels. Perform test on panels of SAE 1020, <br /> 20 gage, cold worked steel . Panels 3 by 6 inches or larger are satisfactory. <br /> Degrease the panels in trichloroethylene vapor conforming to 0-T-634, type II , <br /> then wipe with lint-free rags, removing all rust with No. 0 emery cloth. De- <br /> grease the panels again in trichloroethylene vapor and then dry. Apply one <br /> coat of material conforming to TT-E-485, type IV, by spray to one side of the <br /> panels to a dry film thickness of 0.7 to 1 .0 mil . Bake the sprayed panels <br /> 30 minutes at 300°F. , condition 24 hours at room temperature and then age for <br /> 24 hours at 120°F. The panels may be used at any time subsequent to this <br /> treatment if the paint is undamaged. <br /> 19 i <br />