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Headbolt won't tighten?

Old 03-15-09, 07:33 PM
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hyunelan2
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Headbolt won't tighten?

Tonight, after my first ride of the season, I decided to "flip" the stem on my roadbike. As I was starting I thought, "good thing I decided to do this, the headbolt seems loose."

So, all things proceeded as normal and I started reassembly. As I started tightening the headbolt, it didn't seem to be getting very tight. I put the torquewrench on it, and sure enough, as I turned the bolt would get tighter, then slip and loosen back up. I checked the threads on the bolt, they seem fine.

Is it possible that the star-fangled-nut inside the steerer tube is actually slipping? Other suggestions? I'm not worried about the whole thing coming apart, but I have that annoying "boing" vibration due to the headset not being tight enough.

This is a Cane Creek IS-2 headset, carbon fork with aluminum steerer, FSA OS-99 stem.
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Old 03-15-09, 07:58 PM
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sooprvylyn
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You star nut is probably stripped, unless your bolt is stripped. I don't now how easily you can remove the old nut but you can get a new bolt and push the original nut down far enough to insert the new nut. I'd try a new bolt first though.
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Old 03-15-09, 08:25 PM
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Originally Posted by hyunelan2 View Post
Tonight, after my first ride of the season, I decided to "flip" the stem on my roadbike. As I was starting I thought, "good thing I decided to do this, the headbolt seems loose."

So, all things proceeded as normal and I started reassembly. As I started tightening the headbolt, it didn't seem to be getting very tight. I put the torquewrench on it, and sure enough, as I turned the bolt would get tighter, then slip and loosen back up. I checked the threads on the bolt, they seem fine.

Is it possible that the star-fangled-nut inside the steerer tube is actually slipping? Other suggestions? I'm not worried about the whole thing coming apart, but I have that annoying "boing" vibration due to the headset not being tight enough.

This is a Cane Creek IS-2 headset, carbon fork with aluminum steerer, FSA OS-99 stem.
That bolt is to set the preload for the headset, it doesn't need to be "tight". That cap and bolt can be completely removed once the preload is set and the stem bolts have been tightened. Changing a stem requires a headset adjustment. Do you know how to do this?

You've probably pulled the star fangled nut out and up the steerer. You might as well take the cap off and check it.

Edit: Threadless adjustment link: http://www.parktool.com/repair/readhowto.asp?id=65

Last edited by operator; 03-15-09 at 08:35 PM.
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Old 03-15-09, 08:26 PM
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Originally Posted by sooprvylyn View Post
You star nut is probably stripped, unless your bolt is stripped. I don't now how easily you can remove the old nut but you can get a new bolt and push the original nut down far enough to insert the new nut. I'd try a new bolt first though.
Star nuts aren't removed, you just smash it down and insert another one in there.
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Old 03-15-09, 08:31 PM
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Thats what I thought, though I've never seen a nut strip so I've never replaced one, and unless the bolt was installed upside down somehow it shouldn't be slipping either.
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