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--- techtalk:ref:svcproc9 [2024/05/02 05:55]
hippysmack [Sub-Documents]
+++ techtalk:ref:svcproc9 [2024/05/02 22:36] (current)
hippysmack [Cracks]
@@ Line 58: / Line 58: @@
 These gears have a habit of cracking on the ID were the cross section changes thickness. \\
 Cleaning with some 2000 grit emery revealed the crack better in the Left pic below. ((L photo by DirtyCory, R photos by DirtyCory and IronMick, compiled by Hippysmack https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/127032-getting-this-78-back-to-the-way-it-should-be/page17#post2849730)) \\
+If you look at them closely, you will see that the dog pockets are formed not machined. ((ryder rick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/189718-1982-ironhead-transmission-removal-w-pics/page2)) They have sharp corners and some of the corners are adjacent to the root of the gear tooth. Those sharp corners and the thin material create stress risers that encourage cracking. In contrast, look at the pockets on the same Andrews gear, it is machined and the corners are round. \\
 {{:techtalk:ref:svcproc:4_speed_trans_gear_inspection-_ms_3rd_cracked_id_by_dirtycory.jpg?direct&400|}} {{:techtalk:ref:svcproc:4_speed_trans_gear_inspection-_ms_3rd_cracked_and_broken_pics_by_dirtycory_and_ironmick.jpg?direct&400|}}

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