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techtalk:ref:svcproc21 [2021/07/31 22:38] hippysmack [Interpreting the Readings] |
techtalk:ref:svcproc21 [2021/07/31 22:47] hippysmack [Engine Prep] |
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| **Piston position**: | **Piston position**: | ||
| * You can leak test a cylinder at any position so long as the valves are closed. However, TDC on Compression stroke is the accepted practice for this test. | * You can leak test a cylinder at any position so long as the valves are closed. However, TDC on Compression stroke is the accepted practice for this test. | ||
| - | * On a worn cylinder, the most wear is usually in the top inch or so, that is why there is a noticeable ridge there on a worn jug. The least wear is at the bottom inch or so. \\ So I if you want the acid test of how the rings are sealing, it should be done at or close to TDC. Put the bike in high gear to stop piston moving. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=2)) | + | * On a worn cylinder, the most wear is usually in the top inch or so, that is why there is a noticeable ridge there on a worn jug. The least wear is at the bottom inch or so. \\ So if you want the acid test of how the rings are sealing, it should be done at or close to TDC. Put the bike in high gear to stop piston moving. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311&page=2)) |
| * The test takes only a few seconds to repeat so you can also test several locations as long as both valves are closed. | * The test takes only a few seconds to repeat so you can also test several locations as long as both valves are closed. | ||
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| **Put the transmission in high gear and hold / lock the rear brakes**: | **Put the transmission in high gear and hold / lock the rear brakes**: | ||
| - | * During the leak-down test, when you apply the air pressure to the cylinder, the piston will try to be driven downward. If allowed to move, it can quickly turn the engine over, while turning the rear wheel. (How much the bike will jump depends on the gauge/pressure you're using.) | + | * During the leak-down test, when you apply the air pressure to the cylinder, the piston will try to be driven downward. \\ If allowed to move, it can quickly turn the engine over, while turning the rear wheel. (How much the bike will jump depends on the gauge/pressure you're using.) |
| * Therefore, secure the wheel by applying the rear brakes or it will just turn over the engine and open the exhaust valve. ((skyboltdan of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | * Therefore, secure the wheel by applying the rear brakes or it will just turn over the engine and open the exhaust valve. ((skyboltdan of the XLFORUM http://xlforum.net/forums/showthread.php?t=48311)) | ||
