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techtalk:evo:oil03 [2019/08/05 12:43] ixl2relax [Known Drive Gear Failure] |
techtalk:evo:oil03 [2020/06/06 02:27] hippysmack [Oil Pump Drive Gear] |
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| ====== Oil Pump Drive Gear ====== | ====== Oil Pump Drive Gear ====== | ||
| **88 and up**: \\ | **88 and up**: \\ | ||
| + | A material change to cast iron for increased service life was implemented on April 23, 1992. ((HD Tech Tip #TT039 dated July 1992)) \\ | ||
| + | The new gear has a part number change to 26318-88A. This part will retrofit to all Sportster models, 1988 and later. \\ | ||
| + | |||
| Below is a used gear that does show some wear. \\ | Below is a used gear that does show some wear. \\ | ||
| {{:techtalk:evo:oil:91-up_oil_pump_drive_gear_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)){{:techtalk:evo:oil:illustration_of_helical_gear_tooth_formation_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\ | {{:techtalk:evo:oil:91-up_oil_pump_drive_gear_1_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)){{:techtalk:evo:oil:illustration_of_helical_gear_tooth_formation_by_hippysmack.jpg?direct&300|}} ((drawing by Hippysmack)) \\ | ||
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| * Generally speaking, the stock (drive gear) is fine for stock power levels and rpm's. Sure, there are some failures on stock or near stock bikes, but it's pretty rare. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) Of course, they do eventually wear down and should be replaced with the upgraded version. | * Generally speaking, the stock (drive gear) is fine for stock power levels and rpm's. Sure, there are some failures on stock or near stock bikes, but it's pretty rare. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) Of course, they do eventually wear down and should be replaced with the upgraded version. | ||
| * The OEM gear is hardened on the surface, but once that is worn through it will wear extremely fast. ((Scuba10jdl http://xlforum.net/forums/showthread.php?t=2002257&highlight=pinion+gear+part+number)) | * The OEM gear is hardened on the surface, but once that is worn through it will wear extremely fast. ((Scuba10jdl http://xlforum.net/forums/showthread.php?t=2002257&highlight=pinion+gear+part+number)) | ||
| - | * This is a common failure in [high HP or RPM] Sportsters, even when nothing gets into the pump to lock it up first. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1848987)) The teeth get sharp and then they break off. \\ If something gets into the pump and locks it up, the teeth get ripped off the gear. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1974986&highlight=bronze+drive+gear&page=3)) | + | * This is a common failure in [high HP or RPM] Sportsters, even when nothing gets into the pump to lock it up first. ((aswracing of the XLFORUM xlforum.net/forums/showthread.php?t=1920827&page=2)) The teeth get sharp and then they break off. \\ If something gets into the pump and locks it up, the teeth get ripped off the gear. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1974986&highlight=bronze+drive+gear&page=3)) |
| * The failure happens because of pinion shaft runout which causes the engagement depth of the teeth to change as the pinion shaft rotates. \\ What happens is the gear will wear badly in one area. You'll see the teeth getting real sharp there. 180 degrees from that spot, the gear will look like new. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) | * The failure happens because of pinion shaft runout which causes the engagement depth of the teeth to change as the pinion shaft rotates. \\ What happens is the gear will wear badly in one area. You'll see the teeth getting real sharp there. 180 degrees from that spot, the gear will look like new. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) | ||
| * So lots of people get fooled when they check the gear. They'll look at the visible portion from their vantage point only. \\ You have to look all the way around the gear though. The wear will be isolated to one area only. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) | * So lots of people get fooled when they check the gear. They'll look at the visible portion from their vantage point only. \\ You have to look all the way around the gear though. The wear will be isolated to one area only. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2)) | ||
