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Alu frame, steel cartridge BB, thread treatment?

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Alu frame, steel cartridge BB, thread treatment?

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Old 06-18-07, 07:52 AM
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MB4
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Alu frame, steel cartridge BB, thread treatment?

I'm buying a new aluminum frame with a steel cartridge bottom bracket. On my old aluminum frame, the bottom bracket has seized in the frame, and I can't get the drive side cup unscrewed. I think I read on this forum that aluminum and steel will bond and once that happens it is difficult to unscrew them (you have to pour ammonia in the frame to loosen the bonds??). I don't want this to happen again, so how do I treat the threads on my new BB? Loctite, grease, or something else?
Thanks.
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Old 06-18-07, 08:30 AM
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What direction are you turning it?

For Al against steel use a zinc-based anti-seize compound.
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Old 06-18-07, 09:13 AM
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Originally Posted by DMF
What direction are you turning it?

For Al against steel use a zinc-based anti-seize compound.
+1
Threads on the BB turn opposite the direction of the pedals on each side. Purchase anti-seize from your local auto parts store. Tell the person at the counter you'll be using steel parts in aluminum. I use it when assembling everything on a bicycle.
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Old 06-18-07, 10:59 AM
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Never-Seez is a common brand of anti-seize and usually carried by auto parts stores. I use it to install steel or Al cup bottom brackets in steel, Al and Ti frames and it has always worked well and I have no trouble with later disassembly

I also use it to coat the threads of steel sparkplugs installed in Al engine heads and, of course, these threads see conditions of heat and pressure your bike never dreamed of. They always come out easily and cleanly.
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Old 06-18-07, 11:50 AM
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The BB is english threaded, and I am turning clockwise on the drive side to unscrew. I checked the Park Tool site, and they also recommend anti-seize compound. So here's the next question - when does one use regular grease on threads, and when should a person use anti-seize? Thanks for the responses.
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Old 06-18-07, 12:38 PM
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Originally Posted by HillRider
I also use it to coat the threads of steel sparkplugs installed in Al engine heads and, of course, these threads see conditions of heat and pressure your bike never dreamed of.
You've never seen me try to chase Floyd Landis up Palomar Mountain, then
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Old 06-18-07, 02:13 PM
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If you have anti-sieze in your workshop, that's what you use on threads. bk
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Old 06-18-07, 02:57 PM
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Originally Posted by neil0502
You've never seen me try to chase Floyd Landis up Palomar Mountain, then
Before or after doping
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Old 06-18-07, 03:52 PM
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Plain old grease will do; after all, we've used it with steel frames and Al stems and seatposts for years.
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