Need to release loctite!
08-20-14, 08:48 PM
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Need to release loctite!
I applied loctite blue to a bottom bracket thread - non drive side, Left - I was not able to get the left ring seated before the lactate set and need to undo the loctite. Can anyone advise how to do it?
08-20-14, 08:50 PM
#2
Bicycle Repair Man !!!
Blue loctite releases under mechanical force.
08-20-14, 08:56 PM
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+1 The Blue formulation (242) is weak enough to break free with just hand tools. BTW, Loctite takes several minutes to begin to harden and about 24 hours to reach full strength. How much time did you wait before trying to adjust the bottom bracket?
08-20-14, 10:46 PM
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Yes heat but the blue 242 will break free if you can apply enough force to the part.
Also as Hillrider mentioned it take some time to set are you sure it's not cross threaded?
BB threads are very fine and if not careful can be cross threaded quite easily.
I might add I have never needed to use Loctite on a BB.
Also as Hillrider mentioned it take some time to set are you sure it's not cross threaded?
BB threads are very fine and if not careful can be cross threaded quite easily.
I might add I have never needed to use Loctite on a BB.
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Last edited by JTGraphics; 08-20-14 at 10:52 PM.
08-20-14, 10:47 PM
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08-20-14, 10:48 PM
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08-20-14, 10:58 PM
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Blue 242 should release using your tools you installed it with.
But heat is used to release Loctite like the Red heat does soften it and will release quite easily but that kind of heat can not be applied to painted surface or plastic.
But heat is used to release Loctite like the Red heat does soften it and will release quite easily but that kind of heat can not be applied to painted surface or plastic.
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Last edited by JTGraphics; 08-21-14 at 09:06 AM.
08-20-14, 11:04 PM
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Bicycle Repair Man !!!
The OP used blue loctite... the application of heat is not required.
08-21-14, 10:07 AM
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On topic, I never met a set of threads with blue Loctite on them that I couldn't break free with hand tools. How much did you apply, OP?
08-21-14, 10:36 AM
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Not sure I understand the heat required/not required rationale as though there is no middle ground. Application of heat will make disassembly easier (note the degree, not either/or). Consider that a BB shell is larger than the range of recommended diameters for blue Loctite.
Blue threadlocker loses strength at temperatures attainable with a hair dryer -- well before paint damage. Apply heat to the shell and soak it thoroughly to ease BB removal.
Blue threadlocker loses strength at temperatures attainable with a hair dryer -- well before paint damage. Apply heat to the shell and soak it thoroughly to ease BB removal.
08-21-14, 11:12 AM
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08-21-14, 11:42 AM
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Roy; the problem is cross threading, not the loctite.
Now if you had used Red Loctite; you'd need a torch to soften it enough to remove.
The durability of well done powder coat. At my last company, we had to rework a bunch of product, which used red Loctite 271 on the fastener threads. The fasteners went through a powder coated aluminum extrusion into sheet steel brackets. We had to use MAPP gas (yellow cylinder) torches to get enough heat in there for the 271 to soften enough to remove the fasteners. The flame was directly on the powder coated aluminum (flame front was bigger than the screw head). There was no damage whatsoever to the powder coat after a 90 seconds of direct flame.
Now if you had used Red Loctite; you'd need a torch to soften it enough to remove.
The durability of well done powder coat. At my last company, we had to rework a bunch of product, which used red Loctite 271 on the fastener threads. The fasteners went through a powder coated aluminum extrusion into sheet steel brackets. We had to use MAPP gas (yellow cylinder) torches to get enough heat in there for the 271 to soften enough to remove the fasteners. The flame was directly on the powder coated aluminum (flame front was bigger than the screw head). There was no damage whatsoever to the powder coat after a 90 seconds of direct flame.
08-21-14, 12:24 PM
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Loctite sells a release agent,called XNMS.....Smells like nitromethane (model airplane fuel)...Ain't cheap.....$33 for a 1.75oz bottle......Or if you happen to have a barrel of nitro lying around for your top fuel ride...
You can try MEK,acetone.........
Permatex Gasket Remover works....used to be recommended by them at one point.I don't remember if it's paint friendly or not,so be careful with that.
You can try MEK,acetone.........
Permatex Gasket Remover works....used to be recommended by them at one point.I don't remember if it's paint friendly or not,so be careful with that.
Last edited by Booger1; 08-21-14 at 12:29 PM.
08-21-14, 01:19 PM
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Loctite sells a release agent,called XNMS.....Smells like nitromethane (model airplane fuel)...Ain't cheap.....$33 for a 1.75oz bottle......Or if you happen to have a barrel of nitro lying around for your top fuel ride...
You can try MEK,acetone.........
Permatex Gasket Remover works....used to be recommended by them at one point.I don't remember if it's paint friendly or not,so be careful with that.
You can try MEK,acetone.........
Permatex Gasket Remover works....used to be recommended by them at one point.I don't remember if it's paint friendly or not,so be careful with that.
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https://www.jtgraphics.net/cyclist_bicycles.htm
08-21-14, 02:12 PM
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From the Blue Loctite 242 technical data sheet:
In rare instances where hand tools do not work because of excessive engagement length, apply localized heat to nut or bolt to approximately 482ºF (250ºC). Dissasemble while hot.
In rare instances where hand tools do not work because of excessive engagement length, apply localized heat to nut or bolt to approximately 482ºF (250ºC). Dissasemble while hot.
08-21-14, 02:17 PM
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Not sure I understand the heat required/not required rationale as though there is no middle ground. Application of heat will make disassembly easier (note the degree, not either/or). Consider that a BB shell is larger than the range of recommended diameters for blue Loctite.
Blue threadlocker loses strength at temperatures attainable with a hair dryer -- well before paint damage. Apply heat to the shell and soak it thoroughly to ease BB removal.
Blue threadlocker loses strength at temperatures attainable with a hair dryer -- well before paint damage. Apply heat to the shell and soak it thoroughly to ease BB removal.
08-21-14, 03:09 PM
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08-21-14, 03:24 PM
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Force worked! Pretty much. Except the left ring got stripped to the point where I could not use the tool. Soft aluminum. I sawed it out w/o hurting the threads. This was a Stronglight bottom bracket. Neither strong nor light. Luckily I have a shimano bb that works as a replacement - it's a better bb. Thanks for the advice. I'll be more careful next time.
08-21-14, 04:22 PM
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Force worked! Pretty much. Except the left ring got stripped to the point where I could not use the tool. Soft aluminum. I sawed it out w/o hurting the threads. This was a Stronglight bottom bracket. Neither strong nor light. Luckily I have a shimano bb that works as a replacement - it's a better bb. Thanks for the advice. I'll be more careful next time.
you mean never again use loctite on a bottom bracket
then you are good to go
the only time i can think of that someone might resort to loctite on a bb
is with an italian threaded bb
which would have a right handed thread on the drive side cup
but even italian bbs will stay in place if properly torqued