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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bolt that holds on jug has broken!
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[QUOTE="jmics19067, post: 252092, member: 27963"] Yes I am mechanic. Yes I do make mistakes. Yes I will admit them when I believe I am wrong and someone shows me what is right. I didnt think that the opening statement of yours was very friendly. When I am on the computer I am usually having a beer or two . I guess I took offense and tried to play captain budwieser with his beer muscles . I Am Truly Sorry.Anyway as a mechanic the main purpose of my job is to figure out what is wrong and then fix it. Not nessecarily<God I know I spelled that one wrong > to try and figure out why it went wrong. In other words I need to crankout the wok and not think about it. And I do know from plenty experiance that when I grab a couple of NEW nuts and bolts and the impact gun . Then proceed to have a brain fart on occasion and crank them too tight . I strip the threads off the bolt usually more so than the nut but I end up stripping something out. The only time I have broken new bolts while tightening is because something isn't lned up right . Either way you may laugh and snort at some of my work practices If the original question of this thread<forum thread that is> is why it snapped while installing I would say that the stud had a crack in it. in which he could of looked at the broken edge of the stud and seen if there was an indication of rust that went deeper then the thread depth. If the problem was on disassambly I would say that either the threads of the nut rusted onto the stud or that the last time it was assembled the threads galled up from lack of lubrication and welded themslves together. The dissimilar metal corrosion and the galvanic erosion because of it< I believe would be the actual terms ,but i have been wrong before and as long as I draw breath I will be wrong again> could very well pose a problem in corroding the stud away and weakening it. I must admit that I believe I was wrong it saying it was broken because the nut was tighten to much causing the failure. I was under the impression of just the act of tightening the nut past the strength of the stud. Thinking about it more and more, I tend to beleive that the nut was tighten a little too much at last installation. I believe that with the expansion differences between aluminum and steel when hot <aluminum expanding more than the steel> put a greater stress on the bolt than it can handle from it being to close to begin with. That with corrosion weakening the stud and locking the threads together it is no wonder it failed. If all I say comes out to be true then I would say use antisieze.a flat washer and Nylock type locknut, and a torque wrench when assembling. When disassembling look for pits in the stud from rust and or stretchmarks and cracks from the aluminum expanding from heat also from constantly trying to stretch the bolt longer each time you tighten it.That should be more than enough overkill to keep it from snapping again. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Bolt that holds on jug has broken!
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