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techtalk:ref:genmsr07 [2020/08/31 22:47] hippysmack [Possible Causes of a Spun Pinion Shaft Gear] |
techtalk:ref:genmsr07 [2020/09/03 02:53] hippysmack [The Teardown] |
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| ====== The Teardown ====== | ====== The Teardown ====== | ||
| + | * Diagnosis begins before and during teardown as well as during installation of new parts. | ||
| + | * Inspect and mic everything as you tear it down as well as during the install. | ||
| * Take pictures of everything (outside and inside before you remove anything, during and after). \\ After you have the entire engine spread out in pieces is the last time to wonder if you had a pinched oil line since you can't prove it then. | * Take pictures of everything (outside and inside before you remove anything, during and after). \\ After you have the entire engine spread out in pieces is the last time to wonder if you had a pinched oil line since you can't prove it then. | ||
| * Work backwards from the order of installation when removing anything. Just crack them loose in reverse order, then back them off in reverse order. ((wedge of the XLFORUM http://xlforum.net/forums/showthread.php?t=1756724&page=30)) | * Work backwards from the order of installation when removing anything. Just crack them loose in reverse order, then back them off in reverse order. ((wedge of the XLFORUM http://xlforum.net/forums/showthread.php?t=1756724&page=30)) | ||
| + | Try and take pics, just for you, (although we'd like to see them too) before, during and after teardown. | ||
| ====== Possible Causes of Spun Cam Bushings ====== | ====== Possible Causes of Spun Cam Bushings ====== | ||
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| * When installing the pinion nut, use Loctite red per the manual, and torque it to 70ft-lbs. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=5746883)) \\ It's pretty rare to have the gear fail in a stock Sportster. You typically only run into this issue after hop-up work. \\ The factory torque spec is 35-45 ft/lbs. which is too little torque for upgraded engines and often results in a sheared pinion key. | * When installing the pinion nut, use Loctite red per the manual, and torque it to 70ft-lbs. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=5746883)) \\ It's pretty rare to have the gear fail in a stock Sportster. You typically only run into this issue after hop-up work. \\ The factory torque spec is 35-45 ft/lbs. which is too little torque for upgraded engines and often results in a sheared pinion key. | ||
| * In the pic below, the little nub of the key that protrudes from under the oil pump gear is the only portion of the key that engages the pinion gear. ((aswracing of the XLFORUM)) \\ That's why it shears so easily if the nut is loose. There just ain't much holding it besides the clamp force of the nut. \\ The clamp force from the nut holds the pump gear on, not the key. | * In the pic below, the little nub of the key that protrudes from under the oil pump gear is the only portion of the key that engages the pinion gear. ((aswracing of the XLFORUM)) \\ That's why it shears so easily if the nut is loose. There just ain't much holding it besides the clamp force of the nut. \\ The clamp force from the nut holds the pump gear on, not the key. | ||
| - | * Per HD Tech Tip #19, the "T" key simply aligns the pinion for timing the cams. ((HD Tech Tip #19 dated June 1990)) \\ With the introduction of the one piece, right hand flywheel, the pinion shaft no longer has a taper. \\ Instead the oil pump drive gear and the pinion gear depend on clamp load to remain in position. | + | * Per HD Tech Tip #19, the "T" key simply aligns the pinion shaft to the mark on the pinion gear for timing the cams. ((HD Tech Tip #19 dated June 1990)) \\ With the introduction of the one piece, right hand flywheel, the pinion shaft no longer has a taper. \\ Instead the oil pump drive gear and the pinion gear depend on clamp load to remain in position. |
| | Pinion key location ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=2077485&page=22)) | Condition of key after gear spins ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=5746883)) |Pinion gear spun (app 90°), stopped and still turned \\ the cams from new location ((photo by npaisnel of the XLFORUM, edited by Hippysmack http://xlforum.net/forums/showthread.php?t=2077485&page=23))| | | Pinion key location ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=2077485&page=22)) | Condition of key after gear spins ((photo by aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?p=5746883)) |Pinion gear spun (app 90°), stopped and still turned \\ the cams from new location ((photo by npaisnel of the XLFORUM, edited by Hippysmack http://xlforum.net/forums/showthread.php?t=2077485&page=23))| | ||
