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techtalk:ref:tools023 [2020/05/20 04:59] hippysmack ↷ Links adapted because of a move operation |
techtalk:ref:tools023 [2022/01/18 01:50] hippysmack [Using taps / dies to chase debris out of the threads] |
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| ====== Cross Threading ====== | ====== Cross Threading ====== | ||
| The actual failure mechanism of a drain plug: ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10)) | The actual failure mechanism of a drain plug: ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10)) | ||
| - | |{{techtalk:ref:genmsr:cross_threaded_drain_plug_by_dr_dick.jpg?direct&300|}} ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10))| | + | |{{techtalk:ref:tools:cross_threaded_drain_plug_by_dr_dick.jpg?direct&300|}} ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10))| |
| * So when you loosen the plug the upper partially fractured (cast alum don't like flexing) threads will "move back in position" as the plug reengages the 'good' lower threads. ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10)) | * So when you loosen the plug the upper partially fractured (cast alum don't like flexing) threads will "move back in position" as the plug reengages the 'good' lower threads. ((DR Dick of the XLFORUM http://xlforum.net/forums/showpost.php?p=4302785&postcount=10)) | ||
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| And chasing them with standard size taps / dies simply widens that clearance to standard sizes. \\ | And chasing them with standard size taps / dies simply widens that clearance to standard sizes. \\ | ||
| - | **Standard tap and dies** have sharp cutting edges. \\ | + | **Standard tap and dies** have sharp cutting edges. \\\ |
| - | If the threads have not been warped or damaged; \\ | + | If the threads have not been warped or damaged, a die will cut through and remove sealants on bolt threads. \\ |
| - | A die will cut through and remove sealants on bolt threads. \\ | + | Likewise, a tap will cut through and remove grime and dried up sealants in the existing threads. \\ |
| - | Likewise, a tap will cut through and remove sealants on hole threads. \\ | + | There are some holes, however, that are purposely tapped undersize at the factory. \\ |
| + | Running a standard tap in those holes opens the holes up. \\ | ||
| + | (also the low quality taps from the do-it-yourself store are not held to the cutting tolerance that real ground thread H or L limit taps possess) \\ | ||
| + | |||
| + | * Some factory undersize tapped holes on 1957-1976 motors: ((Dr Dick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1888378&page=6)) | ||
| + | * Oil pump studs | ||
| + | * Cylinder base studs | ||
| + | * Rear motor mount studs | ||
| + | * Tool box stud | ||
| **Roll form tap and dies** have rounded cutting edges. \\ | **Roll form tap and dies** have rounded cutting edges. \\ | ||
| Line 70: | Line 78: | ||
| * You can send a pin needle or the like down to the bottom of the hole to see if there is any embedded crap at the bottom. ((ReddTigger from the XLFORUM [[http://xlforum.net/forums/showthread.php?postid=5373930#post5373930]])) | * You can send a pin needle or the like down to the bottom of the hole to see if there is any embedded crap at the bottom. ((ReddTigger from the XLFORUM [[http://xlforum.net/forums/showthread.php?postid=5373930#post5373930]])) | ||
| + | | Chasing cam cover threads. ((photo by AnaChris of the XLFORUM http://xlforum.net/forums/showthread.php?t=1725973&highlight=oil+pump&page=11)) | | ||
| + | |{{:techtalk:ref:tools:chasing_threads_by_anachris.jpg?direct&300|}}| | ||
| ===== Thread File ===== | ===== Thread File ===== | ||
| * This tool is a cross between a tap, a die and a file. | * This tool is a cross between a tap, a die and a file. | ||
