Differences

This shows you the differences between two versions of the page.

--- techtalk:evo:oil03 [2020/11/07 04:47]
hippysmack [Gauge mounted at oil filter pad]
+++ techtalk:evo:oil03 [2021/06/14 07:55]
hippysmack [Known Drive Gear Failure]
@@ Line 257: / Line 257: @@
 Once the pinion gear is removed, the pump drive gear slides off the pinion shaft.
 ===== Known Drive Gear Failure =====
 **Inspect your oil pump drive gear** especially if you've gotten your gearcase cover off anyway to hopefully prevent gear failure before it happens. \\
-  * 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. And 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 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 xlforum.net/forums/showthread.php?t=1920827&page=2)) The teeth get sharp and then they break off.
-  * 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 (especially when the power level is raised). \\ This causes the engagement depth of the teeth to change as the pinion shaft rotates. \\ This causes the teeth of the steel oil pump drive gear to wear badly on one side. \\ You'll see the teeth getting real sharp there. \\ Generally, 180° from the worn teeth (front of tooth pitch) you'll see almost no wear at all so you have to inspect all the way around the gear (rear tooth pitch). ((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))
   * With the gearcase on, you may be able to pull the oil pump and look up inside, and inspect the gear while slowly turning the motor. ((aswracing of the XLFORUM http://xlforum.net/forums/showthread.php?t=1920827&highlight=pinion+gear+locking+tool&page=2))
-  * With the gearcase on, you may still want to remove the pinion nut and gear to get a good prospective on the health of the drive gear. \\ The damage can be easily overlooked. \\ It usually happens on one side of the teeth on the gear due to pinion shaft runout forcing the gear outward while it is moving against the rigid mounted oil pump gear.
+  * You may still want to remove the cover, pinion nut and gear to get a good prospective on the health of the drive gear. The damage can be easily overlooked. \\ It usually happens on one side of the teeth on the gear due to pinion shaft runout forcing the gear outward while it is moving against the rigid mounted oil pump gear.
+  * If you see the teeth sharpening, you're on borrowed time. \\ When one of these steel gears fails, it's really ugly and makes a mess and can damage a lot of other things as well. \\
+  * The bronze gear solves the problem nicely though. It's a Buell piece that came out in 2006. This was a much worse problem on Buells due to the higher power levels. \\ But at 65hp, it's not nearly so big of an issue, so HD never bothered to put them in XL's probably due to cost. \\ It's a good upgrade when hopping up an XL and it's cheap insurance against a catastrophic failure. \\
 |  Teeth worn thin on the stock oil pump gear. ((photo by Hippysmack))  |  Comparison with a new bronze gear. ((photo by Hippysmack))  |

Trace:

Differences

Navigation

Search

Toolbox