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Tiny piece of metal causing rattle inside fork blade

Old 05-10-14, 07:35 AM
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NWrighteous
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Tiny piece of metal causing rattle inside fork blade

The bike: 2013 All City Mr. Pink.

Since I've owned this bike, there has been a rattle in the NDS fork blade caused by a tiny piece (sliver?) of metal trapped inside. I've pulled the fork in an effort to get it out. No dice. I can see it through the welding vent hole with a flashlight, but there's no way for me to get it out.

I'm considering options, such as squeezing a gob of grease inside to keep it from rattling. Or perhaps a magnet? Another mechanic I used to wrench with suggested using some expanding spray foam to trap it in place.

Any other suggestions? I've never had this problem with a bike before. Short of grinding open the fork, dumping out the metal, and welding the bastard back together, I'm not sure what to do.
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Old 05-10-14, 08:11 AM
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I've got a rack that had also had a small piece of metal rattling around inside. I got the little piece of metal under the vent hole where I could see it, doused it with super glue, and quickly shook it down to the bottom of the tube. That wasn't long ago, but it's been silent since.
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Old 05-10-14, 08:40 AM
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Linseed oil, or one of those rust protection sprays for cavities in cars ought to do the trick as well. Expanding foams can be tricky to use, and may trap moisture inside to breed future corrosion problems.
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Old 05-10-14, 10:10 AM
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Thank you, both, for the suggestions. I'll give linseed oil a shot first. If that doesn't hold it, I'll go to superglue.
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Old 05-10-14, 10:37 AM
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Is it still under warrantee? That would certainly be a mfr defect...........
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Old 05-10-14, 12:27 PM
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I do these with a small blob of grease injected through the vent hole. Gravity and vibration walk the grease to the bottom, along with any small bits, where they both stick forever.
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Old 05-10-14, 12:41 PM
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Originally Posted by Wanderer View Post
Is it still under warrantee? That would certainly be a mfr defect...........
I think that you'll get other opinions as to the warranty coverage on this. Without a safety aspect or structural failure any claim will fall in the "customer unhappy" category. This category has a relationship based result more often then not. Andy.
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Old 05-10-14, 12:55 PM
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Originally Posted by Andrew R Stewart View Post
I think that you'll get other opinions as to the warranty coverage on this. Without a safety aspect or structural failure any claim will fall in the "customer unhappy" category. This category has a relationship based result more often then not. Andy.
I was going to leave the warranty question alone, but I wouldn't consider this a defect.

But let's assume it is. Warranty language usually specifies repair or replacement, so if this were presented to me as a warranty issue, I'd opt for th first, and inject a blob or grease or slow curing glue, shake it all to the bottom where the shard will be stuck, and call it a day.
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Old 05-10-14, 01:17 PM
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Originally Posted by FBinNY View Post
I was going to leave the warranty question alone, but I wouldn't consider this a defect.

But let's assume it is. Warranty language usually specifies repair or replacement, so if this were presented to me as a warranty issue, I'd opt for th first, and inject a blob or grease or slow curing glue, shake it all to the bottom where the shard will be stuck, and call it a day.
I agree. and have done such before. Andy.
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Old 05-10-14, 02:03 PM
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I've got a Mavic CXP-33 rim with the same problem. A little piece of metal scrap or shaving in between the rim walls I can't see but can definitely hear. I used to bother me a lot until I realized I can hear it on the stand or while walking the bike but never when I'm riding. After 26,000 miles I've learned to ignore it.
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Old 05-10-14, 02:17 PM
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I have a 1961 Ephgrave track bike with something loose in the top tube. I haven't done anything about it because it is more quirky than annoying: the one imperfection in an otherwise flawless frame.
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Old 05-10-14, 02:23 PM
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Originally Posted by aixaix View Post
I have a 1961 Ephgrave track bike with something loose in the top tube. I haven't done anything about it because it is more quirky than annoying: the one imperfection in an otherwise flawless frame.
Unless perfection bothers you, this is usually easily fixed. Almost builders vent the top tube to either the head or seat tubes or both, with large holes. You should be able to shake out the offending object with a few minutes of effort. After all that's the way we used to stick pebbles into the frames of our overly fastidious riding buddies.

BTW- if it turns out to be a stone or ball bearing, there's a decent chance that the prior owner was in my riding crowd back when.
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Old 05-10-14, 02:26 PM
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A standard procedure is to simply get hair spray - the tacky stuff - switch out spray buttons that accommodate a tube, set this up, insert the tube into the fork hole, spray for a few seconds - it fogs a bit, shake the fork and that's that. The hairspray is sticky, you can figure out what it does.
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Old 05-10-14, 05:16 PM
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Almost builders vent the top tube to either the head or seat tubes or both, with large holes. You should be able to shake out the offending object with a few minutes of effort.
Hey, Francis!
I tried just that when I first got the bike. Ephgrave left only one very small hole. Whatever is in there is too big to pass. My best guess is that it is a blob of solder: the bike is fillet-brazed.
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Old 05-10-14, 06:25 PM
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Originally Posted by aixaix View Post
Hey, Francis!
I tried just that when I first got the bike. Ephgrave left only one very small hole. Whatever is in there is too big to pass. My best guess is that it is a blob of solder: the bike is fillet-brazed.
This is why some builders use a vent hole of a larger size then just what only venting needs. I use at least 1/4" on my frames for the HT and ST holes. Andy.
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Old 05-11-14, 12:54 AM
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was going to suggest compressed air in one vent, debris out the other
but *looks at pics* not a unicrown fork tfw
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Old 05-11-14, 09:10 AM
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Originally Posted by FBinNY View Post
Unless perfection bothers you, this is usually easily fixed. Almost builders vent the top tube to either the head or seat tubes or both, with large holes. You should be able to shake out the offending object with a few minutes of effort. After all that's the way we used to stick pebbles into the frames of our overly fastidious riding buddies.

BTW- if it turns out to be a stone or ball bearing, there's a decent chance that the prior owner was in my riding crowd back when.
That there is funny! I wish there way a way to get a small bearing into one of those carbon top tubes.
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Old 05-12-14, 09:10 AM
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The vent hole is too small for the metal to fall out, and the way the fork is lugged at the crown leaves little space for something trapped to fall out. I've tried shaking the fork upside down—that was about 10 steps before I came to the forum here. If I can't shake it out, I can't imagine a compressor would be much help.

It sounds like it's the manufacturer's fault. I didn't notice it initially because I assumed it was something else—my housing rattling on the frame, or an unsecured bottle cage bolt. I finally singled it out about 9 months later during an overhaul. Submitting for a warranty isn't an ideal option right now—I need the bike for road season. I'll try the linseed oil first since I have it lying around.

Thanks, everyone, for your thoughts.
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