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techtalk:ref:svcproc11d [2021/08/22 18:39] hippysmack |
techtalk:ref:svcproc11d [2024/01/21 06:11] (current) hippysmack |
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| [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
| - | ====== REF: Service Procedures 11E ====== | + | ====== REF: Service Procedures 11D ====== |
| ====== What Causes the 1991-2003 Shift Drum Pins to Walk Out of the Drum ====== | ====== What Causes the 1991-2003 Shift Drum Pins to Walk Out of the Drum ====== | ||
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| **Shift drum endplay also has a roll in the angle of pull from the pawl also**. \\ | **Shift drum endplay also has a roll in the angle of pull from the pawl also**. \\ | ||
| The pawl will pull the drum out or in (depending on the current drum position as opposed to the current pawl push/pull direction). \\ | The pawl will pull the drum out or in (depending on the current drum position as opposed to the current pawl push/pull direction). \\ | ||
| - | So when the pawl grabs a pin, it actually moves the shift drum during that throw. \\ | + | So when the pawl grabs a pin, it actually moves the shift drum sideways during that throw. \\ |
| - | Shift fork and transmission gear movement will also shift the drum as will vibration. \\ | + | Shift fork and transmission gear movement will also move the drum sideways as will vibration. \\ |
| - | In fact, you can stand the bike upright, slap the seat and the drum will shift. \\ | + | In fact, you can stand the bike upright, slap the seat and the drum will move sideways. \\ |
| - | The act of leaning into a curve will also shift the drum (if it's not already shifted in that direction). \\ | + | The act of leaning into a curve will also move the drum (if it's not already moved in that direction to extreme end). \\ |
| | Shift drum end play ((photo by Hippysmack)) | | | Shift drum end play ((photo by Hippysmack)) | | ||
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| But they are forgiving enough to keep them midway in their holes after protruding, creating that side force on the detent plate. \\ | But they are forgiving enough to keep them midway in their holes after protruding, creating that side force on the detent plate. \\ | ||
| If the pins were a full body press, they probably wouldn't pull out so easy. \\ | If the pins were a full body press, they probably wouldn't pull out so easy. \\ | ||
| - | But then again, one has to ask if it's poor pin construction or thermal expansion of the shift drum holes? \\ | + | But then again, one has to ask if it's poor pin construction or thermal expansion of the shift drum holes. \\ |
| However, if it was the drum getting too hot, all the pins would be subject to walking out. \\ | However, if it was the drum getting too hot, all the pins would be subject to walking out. \\ | ||
| - | Some (most) just knock the pins back in the drum with a hammer. And some pull add Loctite to the pins before knocking them back in. \\ | ||
| - | But if you pull the pin out to add Loctite, it'd be best to use it on the sides of the pin (not bottom or not in the drum holes). \\ | ||
| - | Then Loctite should remain in the nooks and crannies between the pin and hole but not in the hole center to block the pin from going home. \\ | ||
| - | If it gets in the hole center, it will hydro-lock the pin and not let it go all the way home. \\ | ||
| - | Keep in mind that hot Loctite may either let go or slide so that may either stop or slow down a moving pin . \\ | ||
| - | |Example of pins pulled out on of xLoneRiderx's shift drum. \\ See the spikes in the side of the pin that create the interference fit in the hole. ((photos by xLoneRiderx of the XLFORUM http://xlforum.net/forums/showthread.php?t=2078814&highlight=detent&page=20))|| | + | |Example of pins pulled out on of xLoneRiderx's shift drum. \\ See the spikes in the side of the pin that create the interference fit in the hole. ((photos by xLoneRiderx of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/201713-1250-unhappiness-2020-edition/page20?t=2078814&highlight=detent&page=20))|| |
| |{{:techtalk:ref:svcproc:shift_drum_pin_pic1_by_xloneriderx.jpg?direct&300|}}| {{:techtalk:ref:svcproc:shift_drum_pin_pic2_by_xloneriderx.jpg?direct&300|}}| | |{{:techtalk:ref:svcproc:shift_drum_pin_pic1_by_xloneriderx.jpg?direct&300|}}| {{:techtalk:ref:svcproc:shift_drum_pin_pic2_by_xloneriderx.jpg?direct&300|}}| | ||
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| One idea is to weld the pins to the drum. \\ | One idea is to weld the pins to the drum. \\ | ||
| However, the load is going to happen any way due to construction and clearances up stream of the pawl (and pin movement is actually a symptom and not a cause). \\ | However, the load is going to happen any way due to construction and clearances up stream of the pawl (and pin movement is actually a symptom and not a cause). \\ | ||
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