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Old 08-20-15, 06:24 PM   #1
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Bicycle Mechanic Help

I have a mongoose mountain bike I been working on for about 3 weeks and I am almost positive the stem is frozen inside . I have removed the bolt at the top and when i put it back in it just drops in and wont tighten at all it just turns. i have tried to break the stem free but it does not udge no matter what. I have looked on youtube but none of it works. If anyone can please Help me with this I would be insanely happy and appreciative lol it is driving absolutely crazy as I have no idea what to do. If you need pictures just tell me of what and I will upload them here.

Thank you to anyone willing to help me.
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Old 08-20-15, 06:34 PM   #2
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What year is your bike? Take a picture of the stem and also pull it out and take a picture of the bottom. It sounds like you may have unscrewed it all the way and the expander nut/wedge has fallen into the headtube.
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Old 08-20-15, 06:45 PM   #3
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What year is your bike? Take a picture of the stem and also pull it out and take a picture of the bottom. It sounds like you may have unscrewed it all the way and the expander nut/wedge has fallen into the headtube.

That is the issue I am trying to take the stem out . it wont come out which is why I think it is frozen I will go take a picture now



I have turned it and it wont break free, I used liquid wrench and it wont budge. nothing is making it turn and I have no idea why. I am literally clueless
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Old 08-20-15, 06:48 PM   #4
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Those stems have a angled wedge at the bottom that tightens against a matching bevel on the stem and that wedge may be jammed in place. Try reaching down from the to with a long metal rod and whack the rod on top with a hammer. That will free the wedge if it's the problem.
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Old 08-20-15, 06:51 PM   #5
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Those stems have a angled wedge at the bottom that tightens against a matching bevel on the stem and that wedge may be jammed in place. Try reaching down from the to with a long metal rod and whack the rod on top with a hammer. That will free the wedge if it's the problem.
fromt he top? ok bro going to go try that now will report in here when I get back thank you very much for replying and helping
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Old 08-20-15, 07:01 PM   #6
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ok here is what I just did, I found a flat end bolt about 2 inches longer then the bolt that goes into it, I put it down through the top and it went ti a little bit past where the bolt would of went and then it stopped so I hit it with the hammer n each time i hit it went further down but got really tight after that it kind of felt like it was going inside of something with each hit. i did it in 3 different spots a few different times but it busted nothing loose
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Old 08-20-15, 07:14 PM   #7
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As low as that stem is there's a strong possibility that the expander has bottomed out inside the fork column. I would spray some PB Blaster or similar down the stem, secure the fork in a strong, well-mounted vise, and then try to twist the stem to see if it budges.
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Old 08-20-15, 07:43 PM   #8
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Heres my tip for removing rusted parts that dont want to come apart-

Air chisel. Got one for about $15 at Harbor Fright years ago and it paid for itself many times over. Grind a curve in the chisel so it wont move off the stem and a couple of brrrrpppss should make it come out. Using penetrating oil is also a plus for easier removal. From your description I doubt if the wedge is part of the problem.

-SP
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Old 08-20-15, 08:01 PM   #9
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I see now. I was reading that all wrong. What the others have said above is the best way to remove it then. As cny-blaster suggested as well, shooting some penetrating oil into it from the stem and letting it sit a day or two will also help trying to rotate it as it's clamped in a vise.
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Old 08-21-15, 01:36 PM   #10
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I see now. I was reading that all wrong. What the others have said above is the best way to remove it then. As cny-blaster suggested as well, shooting some penetrating oil into it from the stem and letting it sit a day or two will also help trying to rotate it as it's clamped in a vise.
I appreciate it. here is an update

it is in a vice and still not budginh but i can see through from one end to the other so would that mean the wedge isnt an issue? something is keeping it tight where I can not budge it. this is driving me crazy lol this bike is a bit special to me so I want to fix it up and etc
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Old 08-21-15, 02:22 PM   #11
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If it's not budging in the vice at all then it's probably due to corrosion and the next step is to find a LBS where a skilled mechanic can saw off and drill the stem out in order to extract the stem. The corrosion is a common problem on older bikes with steel frames and aluminum stems that haven't been serviced frequently.
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