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| AR Services and Capabilities > Automatic Transmission Fluid Testing > Wear Testing |
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Wear Testing |
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| There are a number of wear tests supported by Automotive Research, including ASTM standards and OEM designed tests. |
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| Vickers Wear (ASTM D2882 modified) |
| The three major OEM transmission fluid specifications include a modified version of the ASTM D2882 Vane Pump Wear test. The test is run at 6.9 MPa (1000 psi) for 100 hours. Fluid temperature is maintained at 80oC (175oF). Weights of the pump vanes and outer cam ring are measured before and after test to determine the amount of wear. |
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| DEXRONŽ-VI Sprag Clutch Overrunning Wear Test (SCOWT) |
| The SCOWT is an OEM designed test to evaluate a fluid's anti-wear properties using a transmission one-way roller clutch. The clutch is mounted between two opposing rotation motors, which create a differential rotating speed of 16,800 rpm, and run for one hour. Weight loss of the inner race of sprag clutch is used to determine amount of wear. |
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| Four-Ball Wear (ASTM D4172) |
| A modified version of this standard test is used to evaluate ATF for MERCONŽ. Three steel balls are clamed together and covered with the lubricant to be evaluated. A forth ball is pressed against the top of the others at a specified force of 40 Kg making a 3 point contact. The temperature is regulated at 100°C and the top ball is rotated at 600 rpm for 2 hours. Additionally the test is run at 150°C. The wear scars generated on the lower 3 balls are evaluated for size to determine relative lubricant performance. |
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| Ford One-Way Clutch Wear |
| The OWC test is a new test developed by Ford, which is similar to the SCOWT. A one-way roller clutch is used to measure a fluid's wear resistance by evaluating the wear damage of the inner race. Currently, the evaluation is a visual inspection, though weight loss may be incorporated. This test is not included in the current MERCONŽ specification, but it is expected to be adopted in the next generation specification. |
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